Enterprise java beans(ejb) update 2
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Enterprise Java Beans (EJBs) allow developers to create reusable components (beans) that can be assembled into applications. EJBs provide services like transactions and security so developers can focus on business logic. Beans run under an EJB container that handles method calls and inserts services. There are three types of beans: entity beans represent database rows, session beans represent processes, and message-driven beans consume JMS messages. Session beans can be stateless, with one bean handling multiple clients concurrently without state, or stateful, where each client is assigned its own bean that maintains state.
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Session 3 Tp3
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.
Ejb intro
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.
Abstract #236765 advanced essbase java api tips and tricks
This document provides tips and tricks for using the Advanced Essbase Java API. It discusses getting started with a good IDE and required libraries. It also covers understanding the object model and task sequences, connecting to Essbase databases in embedded and 3-tier modes, accessing member information through IEssMember objects and member strings, using the fast grid API to retrieve data, and best practices for building software like using source code control, automating build scripts, and implementing robust logging.
Ruby on Rails survival guide of an aged Java developer
Cucumber
FactoryGirl
capybara
shoulda
spork
database_cleaner
launchy
selenium
timecop
simplecov
guard
spork
guard-rspec
guard-spork
guard-test
guard-cucumber
guard-livereload
guard-bundler
guard-rails
guard-rspec
guard-spork
guard-test
guard-cucumber
guard-livereload
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guard-rails
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Ejb notes
EJB 3.0, 3.1, Framework, Tutorials, Learning, Beginners, Basics, Environment Setup, Application Server, Container, Enterprise Bean, Annotations, Session Bean, Stateless Session Bean, Stateful Session Bean, Message Driven Bean, Entity Bean, Remote Interface, Lookup, Life Cycle, Interfaces, Interceptors, Callbacks, Deployment Descriptor, Create Application, Access Database, Query Language, Dependency Injection, Exception Handling
Ejb intro
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.
EJB et WS (Montreal JUG - 12 mai 2011)
http://www.montreal-jug.org/content/pr%C3%A9sentation-sur-ejb-web-service-par-romain-roc%C3%A8s-le-jeudi-12-mai-2011-%C3%A0-17h45
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Enterprise java beans(ejb) update 2
- 1. Enterprise Java Beans(EJB) With EJBs, you can develop building blocks ‘ejb components ’ – that u and someone else can assemble and reassemble into different applications. For example , you might create a customer bean that represents a customer in database. You can use that Customer bean in an accouting program, an e-commerce shopping cart and a tech support application. One beauty of EJBs is that you take code reuse to a whole new level, instead of just code it reuses whole functionality and allows you modify that way bean behaves at runtime with touching its java code. 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 14. Put the Bean, the interface and the DD into ejb-jar file META-INF EJB-JAR.XML MYPACKAGE AdvcieBean.class AdviceHome.class Advice.class MYEJB.JAR ejb-jar.xml must be in a directory named META-INF 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 15. Deploy the bean into the server,using the tools provided by the server vendor 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 18. EJB ARCHITECTURE 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 19. EJB uses RMI 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 20. How EJB uses RMI 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 25. How EJB really Works? 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 26. How EJB really Works? 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 27. How EJB really Works? 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 49. Container callbacks invocation 06/25/10 JavaTruths.com:A Portal for all java related stuff!!! Does not Exist Method ready Passivated setSessionContext() ejbCreate() ejbPassivate() ejbActivate() ejbRemove() or timeout Bean throw system exception timeout
- 53. Use sessioncontext for 06/25/10 JavaTruths.com:A Portal for all java related stuff!!! setSessionContext() ejbCreate() Within business method Use your SessionContext for: Get a reference to your home Get a reference to home Get a reference to home Get a reference to your EJB Object Get a reference to your EJB Object Get security info about the client Get security info about the client Get a transaction reference and call methods on it(BMT Beans) For a transaction to rollback(CMT beans) Find out if the transaction has already been set to rollback(CMT beans) Get a transaction reference and call methods on it (BMT beans) Access : Your special JNDI Environment Your special JNDI Env. Your special JNDI Env. Another beans methods Another beans methods A resource manager(like a DB) A resource manager(like a DB)
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- 60. Entity Bean Remote Home Interface 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
- 70. CMP entity Bean is abstract? 06/25/10 JavaTruths.com:A Portal for all java related stuff!!! Match every create with ejbCreate() and ejbPostCreate() Match every home method with and ejbHome<Mname> The finder methods are part of the bean class, but we won’t actually define them in our bean in case of CMP.
- 72. 06/25/10 JavaTruths.com:A Portal for all java related stuff!!!
Editor's Notes
- 06/25/10
- 06/25/10