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- 3. Enterprise JavaBean ◦ Business Object Classes that have fields and methods to implement modules of business logic Session Bean ◦ A transient bean that its data are gone when the client finishes execution. Message Driven Bean ◦ It combines session bean and message listener, allows message to be transferred asynchronously.
- 4. It extends server, typically web server to host applications by way of http request-response model. SingleThreadModel interface controls concurrent access to shared resources. Session Management ◦ To ensure an active session is not timed out, periodic access the session by using service method. ◦ When client interaction is finished, call invalidate method.
- 5. RequestServlet extends HttpServlet and implement request data in HTML. Specified URI pattern relative to the context root. Get data from request object and Create RequestDispatcher to process and include request and response data. ResponseServlet extends HttpServlet and implement response data in HTML. Both override PUT, GET, POST method etc.
- 6. It is a GUI component framework. It has a standard RenderKit for generating HTML 4.01 markup. Features include: ◦ Input validation ◦ Event handling ◦ Page navigation config ◦ Managed model object creation
- 7. JTA provides API for transaction management. JAX-RS defines API for REST service. JAX-WS defines API for SOAP service JDBC API New APIs in J2EE7 ◦ JSON-P ◦ WebSocket ◦ Batch ◦ Concurrency
- 10. It can be used with support of JavaScript resource library code in a JSF application.
- 12. REST Web Services are Synchronous and Request Response in nature. GET based REST web services support only simple types as arguments. POST based Web Service do not need a SOAP envelope or SOAP body. REST web service do not have headers and payload is sent directly. Axis2 allows user to access web services that have simple type parameters via HTTP GET. The web service arriving via GET assumes REST.Other parameters are converted into XML and put into SOAP.
- 13. Junit4
- 16. Spring Framework Mockito JMockit
- 18. EJB supports transaction processing, in the ejb-jar.xml, when it is deployed, the container reads the information and provide necessary support, which includes: ◦ Requiring the client provide an open transaction context ◦ Requiring container start a new transaction when bean is invoked ◦ Requiring the bean be allowed to manage its own transaction ◦ It provides six possible modes of transaction management.
- 19. To speed up loading process, it is possible to keep a cache of EJB database update in memory or in a highly indexed database table, and handle them all in a batch at a later time. But this approach does not prevent data loss during power outage or other serious problem occurs. When remote invocation is needed, ◦ First, use a naming service to locate the EJB’s home interface ◦ Then call on EJB’s home interface to gain access to its remote interface, the container generates a proxy object that interacts with remote clients and passes their method calls to the bean. ◦ Make calls to business method against the remote interface
- 20. There are two approaches to maintain the synchronization: ◦ Bean managed persistence which is preferred if the Entity beans actually represent aggregations of data in several underlying tables, or if you have other complex “data-massaging” to do between the state of the data in the object and its state in an underlying database. ◦ Container managed persistence is straight-forward, at run time, it used ejbStore and ejbLoad depends on the entity bean deployment descriptor.
- 21. Recent architecture trend includes Microservice, SpringBoot. The high demand of scalability, adaptable and quick accessible cloud-based application led the evolution of the technologies. Microservice is component based, independently deployed and is usually utilized across functional teams. The downside of it includes expensive remote calls, coarser-grained remote APIs and increased complexity when redistributing responsibilities between components. Since SpringMVC requires a lot of configuration such as component scan, dispatcher servlet and view resolver, web jars, SpringBoot can autoconfig data sources and dispatch servlet, which makes configuration easier. It also allows packaged jars to be autodeployed with embedded tomcat, so that it becomes self deployable unit into Docker Container with one or more instances running on Virtual Machines.
- 22. Mongo DB is a type of No-SQL database which can be used with micro-service to build scalable applications. When dealing with database, theoretical computer science proposed a CAP theorem, i.e, Consistency, Availability and Partition Tolerance. Database designed with traditional ACID such as RDBMS chose consistency over availability, whereas BASE type such as NoSQL choose availability over consistency. In real time application such as financial application where the transaction truly matters, it is probably a bad idea to use NoSQL.
- 23. One advantage to use SpringBoot is autoConfig, this is achieved via @ComponentScan, @EnableMongoRepositories Spring Data MongDB API uses MongoTemplate to execute the queries, the repository implementation class autowired the mongoTemplate and implements a list of methods to query Mongo data based on Json request input data parameters. For example, it will create a criteria where clause and build main criterion and execute mongTemplate.find() by given Query object.
- 24. http://axis.apache.org/axis2/java/core/docs https://docs.oracle.com/javaee/7/tutorial Enterprise JavaBeans by Tom Valesky