There are three main ways to make objects persistent: object serialization, object-relational mapping, and object database management systems. Entity beans comprise several files including the entity bean class, remote interface, local interface, home interface, primary key class, and deployment descriptors. Message-driven beans allow asynchronous messaging between applications by implementing business logic in the onMessage() method to process received messages.
Bean-Managed Persistent Entity Beans (BMP EJBs) require developers to provide data access logic by implementing methods like ejbCreate(), ejbLoad(), and ejbStore() to map instances between objects and storage. The bean class implements the EntityBean interface and contains business logic, state fields, and EJB-required methods. Deployment descriptors like ejb-jar.xml and jaws.xml define the bean's classes, interfaces, primary key, and database mapping. The client locates the bean's home interface using JNDI to perform create, find, and remove operations on the bean instances.
A container-managed persistent entity bean allows the container to handle all data access logic. The container persists every field behind the scenes. The primary key class fields must match the container-managed fields. The home interface defines a create method to insert new records. When deployed, JAWS reads the jaws.xml file to configure database tables. The bean classes, interfaces, and XML files are packaged in a JAR for deployment. CMP makes development faster but the container operations are not visible to the developer.
This document provides an overview of the Java Persistence API (JPA) which allows Java developers to manage relational data. It describes key concepts like entities, the entity manager, persistence contexts, and configuration files. Entities represent tables in a database and are annotated with @Entity. The entity manager performs CRUD operations and finds entities. Persistence contexts contain managed entity instances for a particular datastore.
Java Persistence API is a collection of classes and methods to persistently store the vast amounts of data into a database which is provided by the Oracle Corporation.
Generally, Java developers use lots of code, or use the proprietary framework to interact with the database, whereas using JPA, the burden of interacting with the database reduces significantly. It forms a bridge between object models (Java program) and relational models (database program).
Introduction to JPA and Hibernate including examplesecosio GmbH
In this talk, held as part of the Web Engineering lecture series at Vienna University of Technology, we introduce the main concepts of Java Persistence API (JPA) and Hibernate.
The first part of the presentation introduces the main principles of JDBC and outlines the major drawbacks of JDBC-based implementations. We then further outline the fundamental principles behind the concept of object relation mapping (ORM) and finally introduce JPA and Hibernate.
The lecture is accompanied by practical examples, which are available on GitHub.
This document provides information on Spring's enterprise data access features, including Data Access Objects (DAOs), data access templates, exception handling, and integration with ORM frameworks like Hibernate. It discusses how Spring provides DAO support classes, exception translation, and resource management to simplify data access. It also covers Spring's JDBC and Hibernate templates which provide a consistent interface and exception handling for data access code. The document shows how to configure datasources, JDBC templates, and Hibernate session factories in Spring.
The document discusses Java Persistence API (JPA) and Hibernate, which are frameworks that help map objects to relational databases and resolve the impedance mismatch between object-oriented and relational models. JPA is a specification that providers like Hibernate implement. Hibernate is an object/relational mapping tool that provides object/relational mapping, object/relational persistence services, and query capabilities. It generates database schemas from object models and vice versa. The document also provides examples of performing basic CRUD operations using JPA and SQL.
Bean-Managed Persistent Entity Beans (BMP EJBs) require developers to provide data access logic by implementing methods like ejbCreate(), ejbLoad(), and ejbStore() to map instances between objects and storage. The bean class implements the EntityBean interface and contains business logic, state fields, and EJB-required methods. Deployment descriptors like ejb-jar.xml and jaws.xml define the bean's classes, interfaces, primary key, and database mapping. The client locates the bean's home interface using JNDI to perform create, find, and remove operations on the bean instances.
A container-managed persistent entity bean allows the container to handle all data access logic. The container persists every field behind the scenes. The primary key class fields must match the container-managed fields. The home interface defines a create method to insert new records. When deployed, JAWS reads the jaws.xml file to configure database tables. The bean classes, interfaces, and XML files are packaged in a JAR for deployment. CMP makes development faster but the container operations are not visible to the developer.
This document provides an overview of the Java Persistence API (JPA) which allows Java developers to manage relational data. It describes key concepts like entities, the entity manager, persistence contexts, and configuration files. Entities represent tables in a database and are annotated with @Entity. The entity manager performs CRUD operations and finds entities. Persistence contexts contain managed entity instances for a particular datastore.
Java Persistence API is a collection of classes and methods to persistently store the vast amounts of data into a database which is provided by the Oracle Corporation.
Generally, Java developers use lots of code, or use the proprietary framework to interact with the database, whereas using JPA, the burden of interacting with the database reduces significantly. It forms a bridge between object models (Java program) and relational models (database program).
Introduction to JPA and Hibernate including examplesecosio GmbH
In this talk, held as part of the Web Engineering lecture series at Vienna University of Technology, we introduce the main concepts of Java Persistence API (JPA) and Hibernate.
The first part of the presentation introduces the main principles of JDBC and outlines the major drawbacks of JDBC-based implementations. We then further outline the fundamental principles behind the concept of object relation mapping (ORM) and finally introduce JPA and Hibernate.
The lecture is accompanied by practical examples, which are available on GitHub.
This document provides information on Spring's enterprise data access features, including Data Access Objects (DAOs), data access templates, exception handling, and integration with ORM frameworks like Hibernate. It discusses how Spring provides DAO support classes, exception translation, and resource management to simplify data access. It also covers Spring's JDBC and Hibernate templates which provide a consistent interface and exception handling for data access code. The document shows how to configure datasources, JDBC templates, and Hibernate session factories in Spring.
The document discusses Java Persistence API (JPA) and Hibernate, which are frameworks that help map objects to relational databases and resolve the impedance mismatch between object-oriented and relational models. JPA is a specification that providers like Hibernate implement. Hibernate is an object/relational mapping tool that provides object/relational mapping, object/relational persistence services, and query capabilities. It generates database schemas from object models and vice versa. The document also provides examples of performing basic CRUD operations using JPA and SQL.
The document provides an overview of mapping value type objects, collections, and database relationships in Hibernate. It discusses how to map shared properties as components using the <component> element, and how to map collections like sets, lists, and bags using the <set>, <list>, and <bag> elements respectively. It also demonstrates how to define one-to-one, one-to-many, and many-to-many relationships between entity classes to represent relationships between database tables.
The document discusses JavaBean properties and custom events. It defines different types of JavaBean properties like simple, boolean, indexed, bound, and constrained properties. It also explains how to create custom events by defining an event class, event listener interface, and event handler. The event handler notifies listeners when an event occurs. Finally, it demonstrates creating a login JavaBean that uses a custom event to validate that a username and password are not the same.
The document discusses JavaBean properties, property editors, and the classes used to implement them in Java. It describes the PropertyEditorSupport class and its methods for creating customized property editors. The PropertyDescriptor class and BeanInfo interface provide information about JavaBean properties, events, and methods. The document also provides tips on using sample JavaBeans from BDK1.1 in Java 2 SDK and creating a manifest file for multiple JavaBeans. Common questions about JavaBeans are answered.
Java Beans allow developers to capture and discover the state of objects by defining classes that follow the Java Bean specification. A Java class is considered a Java Bean if it contains getter and/or setter methods, does not extend other classes or interfaces, and follows other naming conventions. Properties of a Java Bean are any aspects that can be accessed via getter and setter methods. There are different types of properties such as indexed, bound, and constrained properties. Java Beans also support long term persistence by encoding and decoding bean objects from XML files.
The document discusses best practices for using the Java Persistence API (JPA). It covers:
- The entity manager and persistence context manage entities within a scope like a transaction.
- Entities transition between managed, detached, and removed states that impact database synchronization.
- Queries retrieve and manage entities from the persistence context and database.
- Transactions and locking strategies like optimistic and pessimistic concurrency control how changes are made.
- Extended and transaction scoped persistence contexts determine entity lifetime and caching.
- The second level cache can improve performance by caching entities across contexts.
The document discusses the Java Persistence API (JPA) and Hibernate framework. It provides an overview of JPA's main features, the five steps to implement JPA using Hibernate, and the components that make up Hibernate.
The document discusses object-relational mapping and Hibernate. It describes common object-relational mismatches including problems of granularity, subtypes, associations, and data navigation. It then provides an overview of Hibernate and JPA, how to start a Hibernate project, POJOs, Hibernate APIs, configuration, annotations, identifier generators, dynamic SQL generation, immutable entities, property access strategies, generated property values, default property values, entities vs value types, and mapping of collection properties.
- get() throws an ObjectNotFoundException if no data is found, while load() returns a proxy object without hitting the database
- When accessing properties of the proxy object returned by load(), it will trigger a SELECT to the database and throw an ObjectNotFoundException if no data exists
- get() immediately hits the database to check for data, while load() defers the database hit until property access if a proxy is returned
- It is generally better to use get() when you expect data to exist, and check for its return value being null, rather than using load()
The document discusses various advanced features of JDBC including using prepared statements, managing transactions, performing batch updates, and calling stored procedures. Prepared statements improve performance by compiling SQL statements only once. Transactions allow grouping statements to execute atomically through commit and rollback. Batch updates reduce network calls by executing multiple statements as a single unit. Stored procedures are called using a CallableStatement object which can accept input parameters and return output parameters.
The document provides an agenda and overview of Hibernate, an object-relational mapping tool. It discusses problems with traditional programming to relational databases and EJB2 persistence. Hibernate is presented as a solution that allows working with objects instead of tables and provides object querying, associations, inheritance mapping, and transactions. The document outlines Hibernate's mapping strategies, basic operations, querying methods like HQL and criteria, and alternatives like TopLink and iBatis.
The document discusses using Hibernate, an object-relational mapping framework, to provide object persistence and retrieval by mapping Java objects to database tables. It explains what Hibernate does, its features like object-relational mapping and transaction management, and provides examples of persisting and retrieving objects using Hibernate's API. The document also shows how to configure a Hibernate project and map classes and associations between objects and database tables.
This document provides an overview of the Java Persistence API (JPA) including entity classes, managing entities, persisting entity instances, and primary keys.
Some key points covered are:
- Entity classes represent tables in a database and have requirements like the @Entity annotation and a no-arg constructor.
- Entities are managed by an EntityManager which performs CRUD operations and runs queries.
- To persist a new entity, the persist method is called on the entity manager.
- Primary keys can be simple or composite. Simple keys use @Id while composite keys use @IdClass or embed the key class with @EmbeddedId.
This document provides an overview of Hibernate, an object-relational mapping tool for Java. It begins with a list of topics covered and then defines what Hibernate and JDBC are. It describes the Hibernate architecture including configuration, sessions, and mapping. It also discusses annotations, HQL, caching and batch processing. The document provides details on configuring Hibernate with different databases as well as mapping files and object-relational mappings. It explains the use of annotations, HQL, criteria queries, and native SQL with Hibernate.
JPA is a specification that defines a standard for object/relational persistence and object queries with Java. It allows developers to work with objects in Java code while the JPA implementation handles persistence to a relational database. Key aspects include entity objects that represent data, the EntityManager for CRUD operations, and JPQL for object-oriented queries. JPA supports both container-managed and resource-local transactions.
Java D&D, Java File Transfer, Java programming, j2se, java to standard edition, java drag and drop, D&D in java, Getting started with D&D in java, Java Data Transfer, JAVA API, Core java
The document provides an overview of Java Persistence API (JPA) terminology and concepts. It defines key JPA terms like entity, persistence unit, entity manager, and persistence context. It describes entity characteristics and the different types of entity managers, persistence contexts, and transaction managers supported by JPA. The document also covers JPQL, query parameters, named queries, inheritance, collections, caching and more advanced JPA features.
The document discusses Java collection framework. It defines that an array is a collection of elements stored in continuous memory locations with fixed size. Collections were introduced in Java 1.2 to overcome array limitations. The document describes common collection interfaces like List, Set, Map and their implementation classes like ArrayList, LinkedList, HashSet, TreeSet, HashMap etc. It provides details about various collection classes like their creation, methods and differences.
This document discusses entity beans in Java. It defines entity beans as enterprise beans that represent persistent data stored in a database. Each entity bean instance corresponds to a row in a database table. The EJB container is responsible for loading data into entity bean instances and storing it back in the database. Entity beans are persistent, meaning their state exists across client sessions. They also support shared access, with multiple clients accessing the same data through separate entity bean instances. The document outlines the characteristics and lifecycle of entity beans.
Overview of EJB technology.
Enterprise Java Beans (EJB) is a server-side component technology for Java EE based systems (JEE).
Beans are business logic components that implement a standard interface through which the bean is hooked into the bean container (= runtime object for bean).
A Java class implementing one of the standard bean interfaces is an Enterprise Java Bean. Beans can be accessed remotely, usually from a client tier.
The EJB standard was developed to provide a common framework for solving recurring problems in business application development like persistence, transactions,
security and runtime and lifecycle management. The EJB standard evolved greatly over time. EJB version 1 and 2 were complex and required to implement many interfaces
and exception handling in EJBs. EJB version 3 brought great simplifications and did away with interfaces by replacing these with annotations which provide greater flexibility while keeping complexity low. EJBs come in 3 different flavors: Stateless and stateful session beans and message driven beans. Entity beans of EJB version 1 and 2 were replaced by the Java Persistence API in EJB version 3.
The document provides an overview of mapping value type objects, collections, and database relationships in Hibernate. It discusses how to map shared properties as components using the <component> element, and how to map collections like sets, lists, and bags using the <set>, <list>, and <bag> elements respectively. It also demonstrates how to define one-to-one, one-to-many, and many-to-many relationships between entity classes to represent relationships between database tables.
The document discusses JavaBean properties and custom events. It defines different types of JavaBean properties like simple, boolean, indexed, bound, and constrained properties. It also explains how to create custom events by defining an event class, event listener interface, and event handler. The event handler notifies listeners when an event occurs. Finally, it demonstrates creating a login JavaBean that uses a custom event to validate that a username and password are not the same.
The document discusses JavaBean properties, property editors, and the classes used to implement them in Java. It describes the PropertyEditorSupport class and its methods for creating customized property editors. The PropertyDescriptor class and BeanInfo interface provide information about JavaBean properties, events, and methods. The document also provides tips on using sample JavaBeans from BDK1.1 in Java 2 SDK and creating a manifest file for multiple JavaBeans. Common questions about JavaBeans are answered.
Java Beans allow developers to capture and discover the state of objects by defining classes that follow the Java Bean specification. A Java class is considered a Java Bean if it contains getter and/or setter methods, does not extend other classes or interfaces, and follows other naming conventions. Properties of a Java Bean are any aspects that can be accessed via getter and setter methods. There are different types of properties such as indexed, bound, and constrained properties. Java Beans also support long term persistence by encoding and decoding bean objects from XML files.
The document discusses best practices for using the Java Persistence API (JPA). It covers:
- The entity manager and persistence context manage entities within a scope like a transaction.
- Entities transition between managed, detached, and removed states that impact database synchronization.
- Queries retrieve and manage entities from the persistence context and database.
- Transactions and locking strategies like optimistic and pessimistic concurrency control how changes are made.
- Extended and transaction scoped persistence contexts determine entity lifetime and caching.
- The second level cache can improve performance by caching entities across contexts.
The document discusses the Java Persistence API (JPA) and Hibernate framework. It provides an overview of JPA's main features, the five steps to implement JPA using Hibernate, and the components that make up Hibernate.
The document discusses object-relational mapping and Hibernate. It describes common object-relational mismatches including problems of granularity, subtypes, associations, and data navigation. It then provides an overview of Hibernate and JPA, how to start a Hibernate project, POJOs, Hibernate APIs, configuration, annotations, identifier generators, dynamic SQL generation, immutable entities, property access strategies, generated property values, default property values, entities vs value types, and mapping of collection properties.
- get() throws an ObjectNotFoundException if no data is found, while load() returns a proxy object without hitting the database
- When accessing properties of the proxy object returned by load(), it will trigger a SELECT to the database and throw an ObjectNotFoundException if no data exists
- get() immediately hits the database to check for data, while load() defers the database hit until property access if a proxy is returned
- It is generally better to use get() when you expect data to exist, and check for its return value being null, rather than using load()
The document discusses various advanced features of JDBC including using prepared statements, managing transactions, performing batch updates, and calling stored procedures. Prepared statements improve performance by compiling SQL statements only once. Transactions allow grouping statements to execute atomically through commit and rollback. Batch updates reduce network calls by executing multiple statements as a single unit. Stored procedures are called using a CallableStatement object which can accept input parameters and return output parameters.
The document provides an agenda and overview of Hibernate, an object-relational mapping tool. It discusses problems with traditional programming to relational databases and EJB2 persistence. Hibernate is presented as a solution that allows working with objects instead of tables and provides object querying, associations, inheritance mapping, and transactions. The document outlines Hibernate's mapping strategies, basic operations, querying methods like HQL and criteria, and alternatives like TopLink and iBatis.
The document discusses using Hibernate, an object-relational mapping framework, to provide object persistence and retrieval by mapping Java objects to database tables. It explains what Hibernate does, its features like object-relational mapping and transaction management, and provides examples of persisting and retrieving objects using Hibernate's API. The document also shows how to configure a Hibernate project and map classes and associations between objects and database tables.
This document provides an overview of the Java Persistence API (JPA) including entity classes, managing entities, persisting entity instances, and primary keys.
Some key points covered are:
- Entity classes represent tables in a database and have requirements like the @Entity annotation and a no-arg constructor.
- Entities are managed by an EntityManager which performs CRUD operations and runs queries.
- To persist a new entity, the persist method is called on the entity manager.
- Primary keys can be simple or composite. Simple keys use @Id while composite keys use @IdClass or embed the key class with @EmbeddedId.
This document provides an overview of Hibernate, an object-relational mapping tool for Java. It begins with a list of topics covered and then defines what Hibernate and JDBC are. It describes the Hibernate architecture including configuration, sessions, and mapping. It also discusses annotations, HQL, caching and batch processing. The document provides details on configuring Hibernate with different databases as well as mapping files and object-relational mappings. It explains the use of annotations, HQL, criteria queries, and native SQL with Hibernate.
JPA is a specification that defines a standard for object/relational persistence and object queries with Java. It allows developers to work with objects in Java code while the JPA implementation handles persistence to a relational database. Key aspects include entity objects that represent data, the EntityManager for CRUD operations, and JPQL for object-oriented queries. JPA supports both container-managed and resource-local transactions.
Java D&D, Java File Transfer, Java programming, j2se, java to standard edition, java drag and drop, D&D in java, Getting started with D&D in java, Java Data Transfer, JAVA API, Core java
The document provides an overview of Java Persistence API (JPA) terminology and concepts. It defines key JPA terms like entity, persistence unit, entity manager, and persistence context. It describes entity characteristics and the different types of entity managers, persistence contexts, and transaction managers supported by JPA. The document also covers JPQL, query parameters, named queries, inheritance, collections, caching and more advanced JPA features.
The document discusses Java collection framework. It defines that an array is a collection of elements stored in continuous memory locations with fixed size. Collections were introduced in Java 1.2 to overcome array limitations. The document describes common collection interfaces like List, Set, Map and their implementation classes like ArrayList, LinkedList, HashSet, TreeSet, HashMap etc. It provides details about various collection classes like their creation, methods and differences.
This document discusses entity beans in Java. It defines entity beans as enterprise beans that represent persistent data stored in a database. Each entity bean instance corresponds to a row in a database table. The EJB container is responsible for loading data into entity bean instances and storing it back in the database. Entity beans are persistent, meaning their state exists across client sessions. They also support shared access, with multiple clients accessing the same data through separate entity bean instances. The document outlines the characteristics and lifecycle of entity beans.
Overview of EJB technology.
Enterprise Java Beans (EJB) is a server-side component technology for Java EE based systems (JEE).
Beans are business logic components that implement a standard interface through which the bean is hooked into the bean container (= runtime object for bean).
A Java class implementing one of the standard bean interfaces is an Enterprise Java Bean. Beans can be accessed remotely, usually from a client tier.
The EJB standard was developed to provide a common framework for solving recurring problems in business application development like persistence, transactions,
security and runtime and lifecycle management. The EJB standard evolved greatly over time. EJB version 1 and 2 were complex and required to implement many interfaces
and exception handling in EJBs. EJB version 3 brought great simplifications and did away with interfaces by replacing these with annotations which provide greater flexibility while keeping complexity low. EJBs come in 3 different flavors: Stateless and stateful session beans and message driven beans. Entity beans of EJB version 1 and 2 were replaced by the Java Persistence API in EJB version 3.
The document discusses the key changes and improvements in EJB 3.0, including a simplified programming model using annotations, a new entity bean development model and persistence functionality using the entity manager API. It provides an overview of the new approach and covers topics like entity beans and their lifecycle, the entity manager, queries, object-relational mapping, transactions and how session and message-driven beans work in EJB 3.0.
The Unified Expression Language (EL) provides a simplified way to access objects in JSP and JSF, allowing values to be retrieved from or assigned to JavaBeans properties and elements in collections, and supporting implicit objects, operators, and conditional evaluation. EL was created to unify the different expression languages used in JSP and JSF and addresses issues with earlier technologies like JSTL and JSP by providing a more powerful yet concise syntax. EL evaluates expressions and returns values or references to support both immediate and deferred access of data in web applications.
Setting Business Logic with EJB
The document discusses setting business logic with Enterprise JavaBeans (EJB). It covers key concepts of EJB including session beans, stateless and stateful beans, dependency injection, transactions, security, and more. It also compares EJB to other technologies like Spring.
The document discusses the different scopes that can be used to store objects and data in JSP and servlet applications - page, request, session, and application. Objects stored in different scopes are accessible from different parts of the application. Data can be stored in these scopes using attributes, which are key-value pairs. The document provides examples of how to store and retrieve attributes using these different scopes in both JSP pages and servlets.
This document discusses Java beans and Enterprise Java Beans (EJB). It defines a Java bean as a reusable software component that can be visually manipulated in builder tools. The primary goal of Java beans is to be write once and run anywhere (WORA). EJBs are server-side components that enable rapid development of distributed, transactional, and secure applications. EJBs provide features like transaction management, distributed transaction support, and portability. The document outlines the EJB architecture including EJB containers, clients, interfaces, stubs, and the different types of enterprise beans - entity beans, session beans, and message-driven beans.
This document provides an overview of Enterprise Java Beans (EJB) including:
- The different types of EJB components including session beans, message-driven beans, and entities.
- Session beans can be stateless, stateful, or singleton and their differences are summarized.
- How EJB components are accessed through local, remote, and no-interface views using dependency injection or JNDI lookups.
- Message-driven beans process asynchronous JMS messages.
- Transactions, persistence contexts, and resources can be managed by the EJB container through annotations.
The document provides an overview of enterprise bean world. There are three types of EJB components - session beans, message-driven beans, and entities. Session beans and message-driven beans are used to implement business logic while entities are used for persistence. Metadata annotations are used to configure EJBs by specifying services. EJBs allow building applications using traditional four-tier architecture or domain-driven design. Dependency injection is used to inject resources and components into EJBs.
This document provides an overview of Java Server Pages (JSP) technology. It discusses JSP architecture, the JSP execution procedure and lifecycle. Key differences between JSP and servlets are outlined, such as JSP being used more for the front-end/UI while servlets are better for processing. Advantages of JSP include combining HTML and Java code and dynamic compilation. Disadvantages include errors being difficult to trace and higher disk usage/processing times on first access.
The document provides an overview of server-side scripting technologies including CGI, Java servlets, and JSP. CGI scripts are executed on the web server with disadvantages of high server load. Servlets are Java programs that provide platform independence, performance, extensibility, and safety. JSPs simplify server-side scripting by allowing Java code to be embedded within HTML pages and are translated to servlets. The life cycle of a servlet including initialization, processing requests, and destruction is also summarized.
Java Server Page (JSP) is a technology that helps create web applications similarly to servlets. JSP pages contain HTML code and JSP tags, making them easier to maintain than servlets by separating design from development. JSP provides additional features like expression language and custom tags. JSP is an extension of servlets and allows using implicit objects, predefined tags, and expression language to simplify development compared to servlets. A JSP page is translated to a servlet by the JSP translator, then compiled and executed similarly to servlets through initialization, request processing, and destruction.
Java Server Pages (JSP) is a technology that allows developers to create dynamic web applications using Java code embedded in HTML pages. JSP pages are compiled into Java servlets, allowing dynamic content to be generated. JSP supports the use of scripting elements like expressions, scriptlets, and declarations directly in HTML pages to add dynamic functionality. Common elements like directives, actions, and standard tags provide functionality like including pages, passing parameters, and abstracting common patterns.
JSP stands for Java Server Pages and enables developers to embed Java code directly into HTML pages. JSP pages have a .jsp extension and allow for platform-independent development since Java code can run on any system. The JSP request is sent to the web server, which passes the .jsp file to the JSP servlet engine. If it is the first request, the JSP file is parsed into a servlet class file; otherwise, an instantiated servlet handles the request. The servlet output is then sent to the user's browser.
1. The document discusses the differences between a web server and application server, with application servers containing both a web container and EJB container while web servers only contain a web container and do not support clustering.
2. It describes the key components of EJB - the home interface, remote interface, and bean class - and their purposes. The home interface acts as a factory, the remote interface contains business methods, and the bean class implements both interfaces.
3. It outlines the basic architecture and workflow of how a client accesses EJBs, first looking up the home interface and then using it to get a reference to the remote interface to invoke business methods on the bean.
This document provides an introduction to the Java Platform, Enterprise Edition (JEE). It discusses the course details, including contents, assessment, and lectures. It covers JEE technology overview, containers, architecture, and APIs. The lectures include an overview of JEE, transaction processing and ACID properties, multilayered architectures, and 1-tier, 2-tier, 3-tier and n-tier architectures.
This document provides an overview of Java Server Pages (JSP) technology. Some key points:
- JSP allows separation of work between web designers and developers by allowing HTML/CSS design and Java code to be placed in the same file.
- A JSP page is compiled into a servlet, so it can take advantage of servlet features like platform independence and database-driven applications.
- JSP pages use tags like <jsp:include> and <jsp:useBean> to include content and access JavaBeans. Scriptlets, expressions, declarations, and directives are also used.
- Implicit objects like request, response, out, and session are automatically available in JSP pages
1) Enterprise JavaBeans (EJBs) are server-side components that expose methods for performing application logic. There are two main types: session beans and message-driven beans.
2) Session beans represent actions or a session and can be either stateless or stateful. Stateless session beans handle a single request and do not maintain conversational state, while stateful session beans span multiple requests and retain state for an individual client.
3) The document provides an example of a bank account application using EJBs, and describes the components of an EJB including business interfaces, EJB classes, and packaging into an EJB JAR file.
The key components of an enterprise bean include the bean class, EJB object, home interface, home object, and deployment descriptors. A stateless session bean handles business logic without retaining data between method calls. The EJB container manages transactions, security, and instances to provide services to the bean. Clients access beans through JNDI lookup of the home object which creates EJB objects that delegate method calls to the bean class. Deployment requires packaging the bean class, interfaces, and descriptors into an ejb-jar file.
Enterprise Java Beans (EJBs) are software components that run within a special EJB container. The container handles complex tasks like transactions, security, persistence and more, allowing developers to focus on business logic. There are three main types of EJBs - entity beans for data access, session beans for business processes, and message-driven beans for asynchronous messaging. The document provides details on how each type of EJB interacts with and is managed by the container.
The document discusses Enterprise Java Beans (EJBs), which allow reusable business logic components in Java. EJBs handle transaction management, security, and other services so developers can focus on business logic. Clients access EJBs through remote interfaces using RMI. There are three types of EJBs: session beans for transient client requests, entity beans for persistent data, and message-driven beans for asynchronous messaging. The document explains the EJB architecture, lifecycles, and how clients interact with EJBs through remote interfaces.
The document discusses how the EJB container manages EJB components through the use of proxies and dependency injection. Some key points:
- The EJB container acts as a proxy between clients and bean instances, providing services like transactions and security. It generates a proxy object for each bean.
- The proxy object handles container services and manages the bean lifecycle transparently to clients. Clients interact with the proxy, not the bean directly.
- Dependency injection allows bean classes to access resources and the EJB context. Resources are mapped to JNDI names that the container resolves.
- Interceptors can intercept method calls to beans to add logging or other cross-cutting concerns without modifying bean code
The document discusses various ways that EJB clients can access and interact with EJB beans, including:
1) An EJB bean acting as a client to another bean by looking up the bean's home interface and invoking methods.
2) Serializing a handle to a bean so the reference can be stored and used later to access the bean.
3) Clients managing transactions across multiple bean invocations using the UserTransaction interface.
4) Clients authenticating with the EJB server by passing principal and credential properties.
The document discusses the Enterprise JavaBeans (EJB) architecture. It introduces EJB components and their runtime environment. The key aspects covered include: EJB types like session beans, entity beans, message-driven beans; the EJB container which provides services to managed EJB instances; synchronous and asynchronous communication between EJB components; and relationships like those between entity beans.
Enterprise JavaBeans (EJBs) are reusable software components that can represent either business logic or data. There are two main types of EJBs - session beans which represent business logic and entity beans which represent and manipulate data. EJBs provide benefits like transaction management, security, and abstraction from technical details. They allow components to be reused across applications and systems. EJBs communicate using RMI over IIOP and can be accessed from various clients including other EJBs, servlets, JSPs and applications in any language that supports CORBA.
Flush() synchronizes the database with pending changes in the persistence context. Close() ends the session and detaches all objects. Clear() detaches all objects but keeps the session open, allowing further work before needing to
Enterprise JavaBeans (EJBs) are reusable software components that can represent either data (entity beans) or business logic (session beans). EJBs provide benefits like transaction management, security, and the ability to be deployed on application servers. There are different types of session beans, including stateful and stateless, and entity beans can use either bean-managed or container-managed persistence to access a database. To use an EJB, a client first locates its home interface using JNDI and then calls methods on the home interface to access the bean.
The document contains questions related to Java Spring and Hibernate concepts and implementations. Some key concepts discussed include:
- Dependency injection and inversion of control in Spring
- Differences between Spring BeanFactory and ApplicationContext
- Typical bean lifecycle in Spring container
- Benefits of using an ORM tool like Hibernate
- General flow of communication between Hibernate and a relational database
Stateful session beans maintain conversational state between client requests by saving the bean's state to a database or file when it is passivated. This state is then restored when the bean is activated for a new client request. The container uses object serialization to save and restore the bean's state. Stateful session beans are appropriate when a business process requires multiple method invocations, while stateless session beans are better for single method calls since they do not maintain conversational state between invocations.
The document discusses Enterprise Java Beans (EJB) technology. It begins with an introduction to Java 2 Enterprise Edition (J2EE) and its value propositions. It then describes the various J2EE technologies including EJB, Servlets, JavaServer Pages (JSP), Java Message Service (JMS), and others. The remainder of the document focuses on EJB, describing the different EJB types (entity, session, message-driven), their life cycles, roles in development, and how applications are built and deployed using multiple EJBs.
The document provides an overview of Enterprise JavaBeans (EJB) architecture including what EJBs are, the key features and benefits of EJBs, the different types of EJBs, and the roles involved in EJB development. It describes how EJB containers provide services like transactions, security, and persistence to EJB components and how clients interact with EJBs through remote interfaces.
The document presents an outline for a presentation on commercial systems. It includes:
- Part A presented by Bahman on Java Beans and Enterprise Java Beans.
- Part B presented by John on CORBA, OLE, and ActiveX.
- Part C presented by Andrew on COM, DCOM, and COM+.
Hibernate is a popular Java ORM tool that allows mapping of Java objects to database tables. It handles common persistence tasks like caching, lazy loading, and dirty checking automatically. Hibernate objects are simple POJOs that follow some conventions for mapping. The SessionFactory manages object-relational mappings and connections to the database, while Sessions represent a single-threaded conversation between the application and database.
This document discusses several Java technologies for building distributed applications: RMI, CORBA, JavaBeans, and Java IDL. It provides details on:
- RMI allows Java objects to invoke methods on remote objects residing in different JVMs. It uses stubs and skeletons as proxies.
- CORBA is a standard for building distributed applications and allows objects to interact across different platforms. It uses IDL for interface definitions.
- JavaBeans is a software component model for reusable GUI components. The document demonstrates how to create, configure, save and load JavaBeans.
Hibernate is an object-relational mapping tool that allows developers to more easily write applications that interact with relational databases. It does this by allowing developers to map Java classes to database tables and columns, so that developers can interact with data through Java objects rather than directly with SQL statements. Hibernate handles the conversion between Java objects and database rows behind the scenes. Some key benefits of using Hibernate include faster data retrieval, avoiding manual database connection management, and easier handling of database schema changes.
1. The document provides an overview of the major Java 2 Enterprise Edition (J2EE) technologies including Java servlets, JavaServer Pages (JSP), Enterprise JavaBeans (EJB), Java Message Service (JMS), Java Database Connectivity (JDBC), and Java Naming and Directory Interface (JNDI).
2. It describes the basic anatomy and functionality of servlets, JSP, EJB components including session and entity beans, and JMS.
3. Examples of simple servlet, JSP, EJB, and JMS code are included to illustrate how each technology can be implemented.
The document provides an overview of J2EE (Java 2 Enterprise Edition) technologies including servlets, JSP, EJB, and how they are used to build web applications. It describes the major components of J2EE like servlets, JSP, EJB, their anatomy and usage. Sample code is also included to demonstrate servlets and JSP.
Learning spark ch01 - Introduction to Data Analysis with Sparkphanleson
Learning spark ch01 - Introduction to Data Analysis with Spark
References to Spark Course
Course : Introduction to Big Data with Apache Spark : http://ouo.io/Mqc8L5
Course : Spark Fundamentals I : http://ouo.io/eiuoV
Course : Functional Programming Principles in Scala : http://ouo.io/rh4vv
Firewall - Network Defense in Depth Firewallsphanleson
This document discusses key concepts related to network defense in depth. It defines common terms like firewalls, DMZs, IDS, and VPNs. It also covers techniques for packet filtering, application inspection, network address translation, and virtual private networks. The goal of defense in depth is to implement multiple layers of security and not rely on any single mechanism.
This document discusses wireless security and protocols such as WEP, WPA, and 802.11i. It describes weaknesses in WEP such as vulnerabilities in the RC4 encryption algorithm that allow attacks like dictionary attacks. It introduces WPA as an improvement over WEP that uses stronger encryption keys, protocols like TKIP that change keys dynamically, and AES encryption in 802.11i as stronger alternatives. It also discusses authentication methods like 802.1X that distribute unique keys to each user to address issues with shared keys in WEP.
Authentication in wireless - Security in Wireless Protocolsphanleson
The document discusses authentication protocols for wireless devices. It begins by describing the authentication problem and some basic client-server protocols. It then introduces the challenge-response protocol which aims to prevent replay attacks by including a random number in the response. However, this protocol is still vulnerable to man-in-the-middle and reflection attacks. The document proposes improvements like including an identifier in the hashed response to prevent message manipulation attacks. Overall, the document provides an overview of authentication challenges for wireless devices and the development of challenge-response protocols to address these issues.
HBase In Action - Chapter 04: HBase table designphanleson
HBase In Action - Chapter 04: HBase table design
Learning HBase, Real-time Access to Your Big Data, Data Manipulation at Scale, Big Data, Text Mining, HBase, Deploying HBase
HBase In Action - Chapter 10 - Operationsphanleson
HBase In Action - Chapter 10: Operations
Learning HBase, Real-time Access to Your Big Data, Data Manipulation at Scale, Big Data, Text Mining, HBase, Deploying HBase
Hbase in action - Chapter 09: Deploying HBasephanleson
Hbase in action - Chapter 09: Deploying HBase
Learning HBase, Real-time Access to Your Big Data, Data Manipulation at Scale, Big Data, Text Mining, HBase, Deploying HBase
This chapter discusses Spark Streaming and provides an overview of its key concepts. It describes the architecture and abstractions in Spark Streaming including transformations on data streams. It also covers input sources, output operations, fault tolerance mechanisms, and performance considerations for Spark Streaming applications. The chapter concludes by noting how knowledge from Spark can be applied to streaming and real-time applications.
This chapter discusses Spark SQL, which allows querying Spark data with SQL. It covers initializing Spark SQL, loading data from sources like Hive, Parquet, JSON and RDDs, caching data, writing UDFs, and performance tuning. The JDBC server allows sharing cached tables and queries between programs. SchemaRDDs returned by queries or loaded from data represent the data structure that SQL queries operate on.
Learning spark ch07 - Running on a Clusterphanleson
This chapter discusses running Spark applications on a cluster. It describes Spark's runtime architecture with a driver program and executor processes. It also covers options for deploying Spark, including the standalone cluster manager, Hadoop YARN, Apache Mesos, and Amazon EC2. The chapter provides guidance on configuring resources, packaging code, and choosing a cluster manager based on needs.
This chapter introduces advanced Spark programming features such as accumulators, broadcast variables, working on a per-partition basis, piping to external programs, and numeric RDD operations. It discusses how accumulators aggregate information across partitions, broadcast variables efficiently distribute large read-only values, and how to optimize these processes. It also covers running custom code on each partition, interfacing with other programs, and built-in numeric RDD functionality. The chapter aims to expand on core Spark concepts and functionality.
Learning spark ch05 - Loading and Saving Your Dataphanleson
The document discusses various file formats and methods for loading and saving data in Spark, including text files, JSON, CSV, SequenceFiles, object files, and Hadoop input/output formats. It provides examples of loading and saving each of these file types in Python, Scala, and Java code. The examples demonstrate how to read data from files into RDDs and DataFrames and how to write RDD data out to files in the various formats.
Learning spark ch04 - Working with Key/Value Pairsphanleson
Learning spark ch04 - Working with Key/Value Pairs
Course : Introduction to Big Data with Apache Spark : http://ouo.io/Mqc8L5
Course : Spark Fundamentals I : http://ouo.io/eiuoV
Course : Functional Programming Principles in Scala : http://ouo.io/rh4vv
Learning spark ch01 - Introduction to Data Analysis with Sparkphanleson
Learning spark ch01 - Introduction to Data Analysis with Spark
References to Spark Course
Course : Introduction to Big Data with Apache Spark : http://ouo.io/Mqc8L5
Course : Spark Fundamentals I : http://ouo.io/eiuoV
Course : Functional Programming Principles in Scala : http://ouo.io/rh4vv
XML FOR DUMMIES
The document is a chapter from the book "XML for Dummies" that introduces XML. It discusses what XML is, including that it is a markup language and is flexible for exchanging data. It also examines common uses of XML such as classifying information, enforcing rules on data, and outputting information in different ways. Additionally, it clarifies what XML is not, namely that it is not just for web pages, not a database, and not a programming language. The chapter concludes by discussing how to build an XML document using editors that facilitate markup and enforce document rules.
This document discusses the differences between HTML, XML, and XHTML. It covers how XHTML combines the structure of XML with the familiar tags of HTML. Key points include:
- HTML was designed for displaying web pages, XML for data exchange, and XHTML uses HTML tags with XML syntax.
- XML allows custom tags, separates content from presentation, and is self-describing, while HTML focuses on display.
- Converting to XHTML requires following XML syntax rules like closing all tags, using empty element syntax, proper nesting, and lowercase tags and attribute quotes.
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
We will explore the capabilities of AI in understanding XML markup languages and autonomously creating structured XML content. Additionally, we will examine the capacity of AI to enrich plain text with appropriate XML markup. Practical examples and methodological guidelines will be provided to elucidate how AI can be effectively prompted to interpret and generate accurate XML markup.
Further emphasis will be placed on the role of AI in developing XSLT, or schemas such as XSD and Schematron. We will address the techniques and strategies adopted to create prompts for generating code, explaining code, or refactoring the code, and the results achieved.
The discussion will extend to how AI can be used to transform XML content. In particular, the focus will be on the use of AI XPath extension functions in XSLT, Schematron, Schematron Quick Fixes, or for XML content refactoring.
The presentation aims to deliver a comprehensive overview of AI usage in XML development, providing attendees with the necessary knowledge to make informed decisions. Whether you’re at the early stages of adopting AI or considering integrating it in advanced XML development, this presentation will cover all levels of expertise.
By highlighting the potential advantages and challenges of integrating AI with XML development tools and languages, the presentation seeks to inspire thoughtful conversation around the future of XML development. We’ll not only delve into the technical aspects of AI-powered XML development but also discuss practical implications and possible future directions.
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
“An Outlook of the Ongoing and Future Relationship between Blockchain Technologies and Process-aware Information Systems.” Invited talk at the joint workshop on Blockchain for Information Systems (BC4IS) and Blockchain for Trusted Data Sharing (B4TDS), co-located with with the 36th International Conference on Advanced Information Systems Engineering (CAiSE), 3 June 2024, Limassol, Cyprus.
Generating privacy-protected synthetic data using Secludy and MilvusZilliz
During this demo, the founders of Secludy will demonstrate how their system utilizes Milvus to store and manipulate embeddings for generating privacy-protected synthetic data. Their approach not only maintains the confidentiality of the original data but also enhances the utility and scalability of LLMs under privacy constraints. Attendees, including machine learning engineers, data scientists, and data managers, will witness first-hand how Secludy's integration with Milvus empowers organizations to harness the power of LLMs securely and efficiently.
Unlocking Productivity: Leveraging the Potential of Copilot in Microsoft 365, a presentation by Christoforos Vlachos, Senior Solutions Manager – Modern Workplace, Uni Systems
Driving Business Innovation: Latest Generative AI Advancements & Success StorySafe Software
Are you ready to revolutionize how you handle data? Join us for a webinar where we’ll bring you up to speed with the latest advancements in Generative AI technology and discover how leveraging FME with tools from giants like Google Gemini, Amazon, and Microsoft OpenAI can supercharge your workflow efficiency.
During the hour, we’ll take you through:
Guest Speaker Segment with Hannah Barrington: Dive into the world of dynamic real estate marketing with Hannah, the Marketing Manager at Workspace Group. Hear firsthand how their team generates engaging descriptions for thousands of office units by integrating diverse data sources—from PDF floorplans to web pages—using FME transformers, like OpenAIVisionConnector and AnthropicVisionConnector. This use case will show you how GenAI can streamline content creation for marketing across the board.
Ollama Use Case: Learn how Scenario Specialist Dmitri Bagh has utilized Ollama within FME to input data, create custom models, and enhance security protocols. This segment will include demos to illustrate the full capabilities of FME in AI-driven processes.
Custom AI Models: Discover how to leverage FME to build personalized AI models using your data. Whether it’s populating a model with local data for added security or integrating public AI tools, find out how FME facilitates a versatile and secure approach to AI.
We’ll wrap up with a live Q&A session where you can engage with our experts on your specific use cases, and learn more about optimizing your data workflows with AI.
This webinar is ideal for professionals seeking to harness the power of AI within their data management systems while ensuring high levels of customization and security. Whether you're a novice or an expert, gain actionable insights and strategies to elevate your data processes. Join us to see how FME and AI can revolutionize how you work with data!
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
Fueling AI with Great Data with Airbyte WebinarZilliz
This talk will focus on how to collect data from a variety of sources, leveraging this data for RAG and other GenAI use cases, and finally charting your course to productionalization.
AI 101: An Introduction to the Basics and Impact of Artificial IntelligenceIndexBug
Imagine a world where machines not only perform tasks but also learn, adapt, and make decisions. This is the promise of Artificial Intelligence (AI), a technology that's not just enhancing our lives but revolutionizing entire industries.
Building Production Ready Search Pipelines with Spark and MilvusZilliz
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
AI-Powered Food Delivery Transforming App Development in Saudi Arabia.pdfTechgropse Pvt.Ltd.
In this blog post, we'll delve into the intersection of AI and app development in Saudi Arabia, focusing on the food delivery sector. We'll explore how AI is revolutionizing the way Saudi consumers order food, how restaurants manage their operations, and how delivery partners navigate the bustling streets of cities like Riyadh, Jeddah, and Dammam. Through real-world case studies, we'll showcase how leading Saudi food delivery apps are leveraging AI to redefine convenience, personalization, and efficiency.
TrustArc Webinar - 2024 Global Privacy SurveyTrustArc
How does your privacy program stack up against your peers? What challenges are privacy teams tackling and prioritizing in 2024?
In the fifth annual Global Privacy Benchmarks Survey, we asked over 1,800 global privacy professionals and business executives to share their perspectives on the current state of privacy inside and outside of their organizations. This year’s report focused on emerging areas of importance for privacy and compliance professionals, including considerations and implications of Artificial Intelligence (AI) technologies, building brand trust, and different approaches for achieving higher privacy competence scores.
See how organizational priorities and strategic approaches to data security and privacy are evolving around the globe.
This webinar will review:
- The top 10 privacy insights from the fifth annual Global Privacy Benchmarks Survey
- The top challenges for privacy leaders, practitioners, and organizations in 2024
- Key themes to consider in developing and maintaining your privacy program
Infrastructure Challenges in Scaling RAG with Custom AI modelsZilliz
Building Retrieval-Augmented Generation (RAG) systems with open-source and custom AI models is a complex task. This talk explores the challenges in productionizing RAG systems, including retrieval performance, response synthesis, and evaluation. We’ll discuss how to leverage open-source models like text embeddings, language models, and custom fine-tuned models to enhance RAG performance. Additionally, we’ll cover how BentoML can help orchestrate and scale these AI components efficiently, ensuring seamless deployment and management of RAG systems in the cloud.
4. Persistence Persistence Java Object Serialization Three ways to make an object persistent Object Relational Mapping Object database Persistence Storage Obj 1 Obj 2 Persistence Objects Storage Storage Database
5. Java Object Serialization Object 1 Object 2 Object n State of the object Compact representation Marshall an object graph into a compact representation Serialization of object graph into byte stream Developer pushes data over the network or saves the stream to a storage Byte Stream
6. Object Relational Mapping Database API Relational Database Manual Mapping Use an Object- Relational Mapping Product Object Travel Account String Name String TktNo Double Amount
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8. Components deployed in Multi-tier Deployment- Application logic components Application logic components are components that provide methods which perform common tasks Computing the price of a ticket Billing of products
9. Components deployed in Multi-tier Deployment - Persistent Data Components Object Serialization of data Database Examples are air ticket information such as ticket number and amount Employee data such as salaries and place of work
10. Files in an Entity bean Entity Bean Remote Interface Primary Key Class Entity Bean Class Deployment Descriptors Home Interface Local Interfaces
11. Entity Bean class Models Java Class Persistent Data Maps Database Schema Entity Definition For example , an entity bean class can map to a relational table definition. An entity bean instance of that class will then map to a row in that table.
12. The Entity Bean’s Remote Interface Client Entity Bean Invokes Business Method signatures Remote Interface
13. The Home Interface create find destroy The home interface is used by the clients to create, find and destroy entity bean objects. Client Uses Methods Home Interface Entity Bean Object Entity Bean Object Entity Bean Object
14. Local Interface Local Clients Entity Beans Methods Entity Beans Exposes Local Interface allows the beans to expose its methods to other beans that reside within the same container (local clients). Container
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16. The Deployment Descriptors Container Deployment descriptors List of properties Contacts the deployment descriptor for bean deployment Informs the container about the bean and classes
17. Pooling of Entity Bean Instances EJB Container Entity Bean 1 Entity Bean 2 Entity Bean n Instantiates Storage Data 1 Data 2 Data n Represents Entity Beans Pooled and Recycled Entity Bean 1 When the bean instance is used ,it is assigned to handle different client request.
18. Ways to Persist Entity Beans Data Store Entity Bean Entity Beans map themselves in the data store Bean-managed Persistence Container- Managed Persistence Deployment Descriptor Persistent Beans Deployment Descriptor tells the container about the persistent fields and then the container handles the data logic
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20. Modifying Entity Beans Directly though the Database EJB Container/ Server Entity Beans Existing Application Database O/R Mapping Direct Database Modifications Bean data
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23. ejbFind ( ) Creating a BMP EJB and an EJB object Home object EJB object Entity bean instance EJB Container/ Server 1. Call create() 6. Returns object to the client 2. Call ejbCreate() 4. Returns primary key Client Code 3. Create database data 5. Create EJB object
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26. ejbRemove( )- II Destroying an entity bean’s data representation Home object EJB object Entity bean instance EJB Container/ Server 1. Call remove() 2. Call ejbRemove() Client Code 3. Remove database data 1. Call remove() 2. Call ejbRemove()
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Editor's Notes
This slide is self explanatory. It states the three ways in which objects can be made persistent
The slide is self explanatory. The state of the object is saved to permanent storage. This is done by object serialization. Here an object graph is marshaled into a compact representation . When the object graph is serialized, it is converted into a byte stream. The developer can then push data over the network or save the stream to a storage such as a file system, database or JNDI tree. However, object serialization has some drawbacks. For example, A file system stores a huge amount of serializable employee objects. This is done by converting the objects to their bit blob representation and then storing the bytes on disk. Suppose, employee information is needed for employees who have a salary above a particular amount. With serialisation each and every employee account serialized bit-blob from the disk, construct the corresponding object and then execute a method query on the object to determine if the salary is over that amount. Also, a number of advanced queries may also have to be done. This cannot be done with object serialisation. Querying objects using object serialization is very expensive and cumbersome. Submitting queries against business data is an absolute necessity for large-scale applications, which make simple object serialization has its purpose, it is best used in restricted domains, such as network communications and simple persistence.
Here Java Objects are stored in traditional relational databases such as Oracle or Microsoft SQLServer. As evident in the slide each object is disintegrated into into its constituent parts. If you consider the previous example of the employee object, it can be decomposed into various parts. The employee number could be stored in one relational database row, name in another row and salary in another row. When you save these Java objects you will have to use JDBC or SQL/J to map the object data into a relational database.you could also store the name of the Java class that this data corresponds to, so that you know which class to instantiate when reading the object back from the database. When you want to load your objects from the database, you would first instantiate an object from that class, read the data in from the database and then populate that objects’s instance’s fields with the relational data read in. Object relational mapping as a persistence mechanism is a much more sophisticated mechanism of persisting objects than simple object serialisation. By disintegrating the Java objects as relational data you can issue arbitrary queries for information. For example, you can search through all the database records that have salary greater than the amount and load only objects that fulfill this query. More advanced queries are also possible. Mapping of objects to relational data can be done in two ways. You can either hand craft this mapping in your code or use an object-realtional mapping product such as ObjectPeople’s TOPLink or Sun’s JavaBlend to automate or facilitate this mapping. Today, most users hand-craft the mapping using a database access API such as JDBC or SQL/J. Because the cost of developing and maintaining an object relational mapping layer is significant, it is likely that the object relational mapping products will be adopted. Once a bean’s fields are mapped to the relational database, the container takes over the responsibility of keeping the state of an entity bean instance consistent with with corresponding tables in the database. This process is called synchronising the state of the bean instance.In the case of an EmployeeBean, bean insatnces at runtime will map one-to-one to rows in the Employee table of the relational database. When a change is mad e to the EmployeeBean, it is written to the appropriate row in the database. Frequently bean types will map to more than one table. These are more complicated mappings often requiring a SQL join. In addition to synchronizing the state of an entity, EJB provides mecahanisms for creating and removing entities. Calls to the EJB home to create and remove entities will result in a corresponding insertion or deletion of records in the database. Because entities store their state in a database tables, new records can be added from outside the EJB sytem. In other words, inserting a record into the Employee table or by direct access to the database – creates a new Employee entity . It is not created in the sense of instantiating a Java object, but in the sense that the data that describes an Employee entity has been added to the system. Object-to-relational persistence can become vety complex becauseobjects don’t always map cleanly to a relational database. Although you can specify any java serializable type as a container-managed field, Java objects don’t always map seamlessly to a relational database. You frequently need to convert Java types to some nonobject type just prior to synchronisation so that the data can be stored in a relational database. There are many other impedance mismatches when mapping object to realtinal databases, and then some EJB vendor implementations deal with them better than others. Relational databases however are still a very good persistence store because they are stable and well-understood. There is no shortage of developers who understood them or products that support them. In addition, the large number of SQL-standard relational databases makes it easy to migrate from one database to another.
Object-oriented datbases are designed to preserve object types and object graphs and therefore are a much better match for components written in an object oriented language like Java. They offer a cleaner mapping between entity beans and the database than a relational database. Serilasable objects can be preserved without the mismatch associated with object-to-relational persistence because the object’s definition and state are simply stored as is to the database. Not only are the object’s definition and state saved to the database, complex relationships like circular references can also be maintained. Because object databases store objects, object databases are viewed by many developers as superior database technology for object persistence. While object databases perform well when it comes to very complex object graphs, they are still fairly new to business systems and are not as widely accepted as relational databases. As a result, they are not as standardized as relational databases making it more difficult to migrate from one database to another. In addition, fewer third-party products exist that support object databases, like products for reporting and data warehousing. Several relational databases support extended features for native object persistence. These databases allow some objects to be preserved in relational database tables like other data types and offer some advantages over other databases.
The slide is self explanatory.
Other examples could include bank account information and college records and so on. Need for persistent data components- why should you deal with business data as objects rather than dealing with raw database data, such as relational rows. The answer is that it is very handy to treat data as objects because they are represented in a compact manner. We can group related data together in a unified object. You associate some simple methods with that data, such as compression or other data related services. You can also gain implicit middleware services from an application server such as transactions, network accessibility and security.
The slide is self explanatory.
No bean is complete without its implementation class. This will reside on the server. When a client invokes a business method on the bean’s remote interface, that method invocation is received by the EJB object, which then delegates it to the bean. When developing any bean, you have to use the bean’s remote interface as a guide. Business methods defined in the remote interface
The business methods of an enterprise bean are defined by a remote interface provided by the bean developer. The java.ejb.EJBObject interface, which extends the java.rmi.Remote interface is the base class for all remote interfaces. Remote interfaces are focused on the business problem and do not include methods for system level operations such as persistence, security, concurrency or transactions. System level operations are handled by the EJB server which relieves the client developer of many responsibilities. All remote interface methods for beans must throw at the very least, a java.rmi.RemoteException which identifies problems with distributed communications. In addition, methods in the remote interface can throw as many custom exceptions as needed to indicate abnormal business related conditions in executing the business method.
The home interface of any entity bean is used to create, locate and remove objects from EJB systems. Each entity bean type has its own home interface. The home interface defines two basic kinds of methods-zero or more create methods and one or more find methods. The create methods act like remote constructors and define how new beans are created. In the Employee example, the find method is used to locate a specific example.
Lets us say you have decided to author your own EJB container/server. Your product is responsible for instantiating entity beans as necessary, with each bean representing data in an underlying storage. As clients connect and disconnect, you could create and destroy data in an underlying storage. As clients connect and disconnect, you could create and destroy beans as necessary to service those clients. Unfortunately, this is not a scalable way to build an application server. Creation and destruction of objects is very expensive, especially if the client requests come frequently. How can we save this overhead? One thing to remember is that an entity bean class describes the fields and rules for your entity bean, but it does not dictate any specific data. For example, an entity bean class may specify that all employee accounts have the following data: Employee name Employee id Salary Department That bean class can then represent any distinct instance of database data such as a particular employee account record. The class itself, though is not specific to any particular employee account. Thus to save precious time instantiating objects, entity bean instances to represent different instances of the same type of data in an underlying storage. For example, a container could could use a employee account to represent different employee accounts. Thus when you are done with an entity bean instance, that instance may be assigned to handle a different client’s request and may be represent different data . The container performs this by dynamically assigning the entity bean instance to different client specific EJB-objects. Not only does this save the container from unnecessarily instantiating bean instances, but this scheme saves on the total amount of resources held by the system. Instance pooling is an interesting optimization that containers may provide and is not all unique to entity beans. Stateless session beans can also be recycled. But as with stateful session beans, there are complications when reassigning entity bean instances to different bean instances to different EJB objects. When your entity beans is assigned to a particular EJB object, it may be holding resources such as socket connections. But when it is in the pool, it may not need that socket. Thus to allow the bean to release and aquire resources, your entity bean class must implement two callback methods. ejbActivate() ejbPassivate()
The slide is self explanatory. Additional Teaching It is sometimes handy to separate the kind of resources that the beans use into two categories:bean specific resources and bean-independent resources. Bean specific resources are resources that your bean uses that are tied to a specific data instance in an underlying storage. For example, a socket connection is a bean specific resource if that socket is used only when your bean instance is bound to a particular object. Such a resource should be acquired when a bean instance is activated and released when the instance is passivated. Bean-independent resources are resources that can be used over and over again no matter what underlying data your instance represents. For example, a socket connection
An entity bean’s instance’s ejbCreate() method is used to initialise a bean for a particular client and to create underlying database data. Each ejbCreate() method you define gives clients a different way to create your beans. Here are some of the rules about ejbCreate(): You do not need to write any ejbCreate() methods with entity beans-Session beans require ejbCreate() methods, but they are optional for entities. You would define an ejbCreate() method if you want to providea way to create some underlying data through EJB. But remember that EJB does allow for you to create some underlying data indirectly, via direct database inserts or legacy systems. Thus ejbCreate() is optional. The parameters to ejbCreate() can vary. This allows for multiple ways to intialise an entity bean instance and thus allows for different ways to create entity bean instance and thus allows for different ways to create entity bean data in a database. For example, one ejbCreate() method might create a checking account,, while another might create a savings account. You must duplicate your ejbCreate() methods in your home interface.In EJB, remember that clients don’t directly invoke on beans-they invoke an EJB object proxy. The EJB object is generated through the home object. Therefore, for each ejbCreate() method signature you define in your bean, you must define a corresponding create() in the home interface. The client calls the home object’s create() which delegates to your bean’s interface. The client calls the home object’s create() which delegates to your beans’s ejbCreate().
Example: Let us say you have a bean-managed persistent bank account entity bean class called AccountBean, with a remote interface account, home interface AccountHome and primary key class AccountPK. Given the following ejbCreate()method in Accountbean: public AccountPK ejbCreate(String accountID,String owner)… You must have this create() in your home interface. public Account create(String accountID, String owner) throws… Notice that there are two different return values here. The bean instance returns a primary key(AccountPK), while the home object returns an EJB object(Account). This makes sense-the bean returns a primary key to the container( that is, to the home object) so that the container can identify the bean. Once the home object has this primary key, it can create an EJB object and return that to the client.