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Java > Learn Java > What are the advanced features of EJB3.1?
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What are the advanced features of EJB3.1?

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1. Support for direct use of EJBs in the servlet container, including simplified packaging options. The current thought is to allow EJBs in the WEB-INF/classes directory while allowing ejb-jar.xml to reside in the WEB-INF directory, just like the web.xml file. In a similar vein, you would be able to...
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1. Support for direct use of EJBs in the servlet container, including simplified packaging options. The current thought is to allow EJBs in the WEB-INF/classes directory while allowing ejb-jar.xml to reside in the WEB-INF directory, just like the web.xml file. In a similar vein, you would be able to place an EJB jar into the WEB-INF/lib directory. 2. EJB Timer Service enhancements to support cron-like scheduling, deployment-time timer creation, and Stateful Session Bean timed objects. 3. Support for stateful web services via Stateful Session Bean web service endpoints. read less
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Support for direct use of EJBs in the servlet container, including simplified packaging options. The current thought is to allow EJBs in the WEB-INF/classes directory while allowing ejb-jar.xml to reside in the WEB-INF directory, just like the web.xml file. In a similar vein, you would be able to place...
read more
Support for direct use of EJBs in the servlet container, including simplified packaging options. The current thought is to allow EJBs in the WEB-INF/classes directory while allowing ejb-jar.xml to reside in the WEB-INF directory, just like the web.xml file. In a similar vein, you would be able to place an EJB jar into the WEB-INF/lib directory. EJB Timer Service enhancements... more» read less
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-Singletons:A singleton is a new kind of session bean that is guaranteed to be instantiated once for an application in a particular Java Virtual Machine (JVM)\*. A singleton is defined using the @Singleton annotation. - Application Startup/Shutdown Callbacks. - Sample Application:The Java EE 6...
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-Singletons:A singleton is a new kind of session bean that is guaranteed to be instantiated once for an application in a particular Java Virtual Machine (JVM)\*. A singleton is defined using the @Singleton annotation. - Application Startup/Shutdown Callbacks. - Sample Application:The Java EE 6 SDK Preview release includes an application that uses each of the EJB 3.1 features covered in this tip. The application is composed of a servlet, a singleton session bean, and a stateless session bean. Each session bean exposes a no-interface view. read less
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Let's simplify Coding, It's a great Fun.

Hi, One of the great feature of EJB3.1 is that they are POJO which means the EJBs can now be unit tested without Enterprise Server. Second being POJO, they do not need to implement and extend any Server related interface or classes as in the earlier 2.x EJBs. Vijay
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Optional interfaces for Session beans and Singleton beans. EJB Timer Service enhancements and simplified packaging. that have been discussed in detail—EJB Timer Service enhancements and simplified packaging. Remember, none of this has been finalized yet, although a draft of the specification will...
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Optional interfaces for Session beans and Singleton beans. EJB Timer Service enhancements and simplified packaging. that have been discussed in detail—EJB Timer Service enhancements and simplified packaging. Remember, none of this has been finalized yet, although a draft of the specification will be released for review soon. All of this is really just a peek into the inner workings of the JCP so that you have a chance to provide feedback. read less
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agree.
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6yrs exp in j2ee

like pojo , for persistany
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Professional Java J2EE Training with certification focus or Maths/English Tuition

Support for direct use of EJBs in the servlet container, including simplified packaging options. The current thought is to allow EJBs in the WEB-INF/classes directory while allowing ejb-jar.xml to reside in the WEB-INF directory, just like the web.xml file. In a similar vein, you would be able to place...
read more
Support for direct use of EJBs in the servlet container, including simplified packaging options. The current thought is to allow EJBs in the WEB-INF/classes directory while allowing ejb-jar.xml to reside in the WEB-INF directory, just like the web.xml file. In a similar vein, you would be able to place an EJB jar into the WEB-INF/lib directory. EJB Timer Service enhancements to support cron-like scheduling, deployment-time timer creation, and Stateful Session Bean timed objects. Support for stateful web services via Stateful Session Bean web service endpoints. read less
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Status DescriptionSTATUS_ACTIVE transaction is in an active stateSTATUS_MARKED_ROLLBACK transaction is marked for rollbackSTATUS_PREPARED transaction is in the prepared state because allresources have agreed to commitSTATUS_COMMITTED associated transaction has been committedSTATUS_ROLLEDBACK associated...
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Status DescriptionSTATUS_ACTIVE transaction is in an active stateSTATUS_MARKED_ROLLBACK transaction is marked for rollbackSTATUS_PREPARED transaction is in the prepared state because allresources have agreed to commitSTATUS_COMMITTED associated transaction has been committedSTATUS_ROLLEDBACK associated transaction has been rolled backSTATUS_UNKNOWN status for associated transaction is not knownSTATUS_NO_TRANSACTION no associated transaction in the current threadSTATUS_PREPARING associated transaction is preparing to be committed andawaiting response from subordinate resourcesSTATUS_COMMITTING transaction is in the process of committingSTATUS_ROLLING_BACK transaction is in the process of rolling back. read less
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EJB Interfaces are Optional -- @Stateless or @Stateful. The Singleton Beans are Here-@Singleton. It’s Time for Timer Service Features-@Timeout, @Schedule Stripped Down EJB Packaging-no need to create a separate EJB jar module. Rather, EJBs can be directly dropped into the WEB-INF/classes directory...
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EJB Interfaces are Optional – @Stateless or @Stateful. The Singleton Beans are Here-@Singleton. It’s Time for Timer Service Features-@Timeout, @Schedule Stripped Down EJB Packaging-no need to create a separate EJB jar module. Rather, EJBs can be directly dropped into the WEB-INF/classes directory and deployed as part of the WAR. In a similar vein, the ejb-jar.xml deployment descriptor, if you happen to be using one, can be placed into the WEB-INF directory along with the web.xml file. It may also be possible to place an EJB jar into the WEB-INF/lib directory. Asynchronous Invocation of Session Beans-annotating a session bean method with @Asynchronous. EJB 3.1 can also support a return type of java.util.concurrent.Futureread less
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