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EJB FAQ Home Page

FAQ Manager is guru Alessandro A. Garbagnati PREMIUM.

Enterprise JavaBeans (EJB) is a server-side component architecture for the development and deployment of distributed object systems for the Java platform. Applications written using the EJB architecture are scalable, transactional, and multi-user secure. [FAQ Previously managed by Richard Monson-Haefel and Alex Chaffee..]

What's New

How do you implement ejbRemove in EJB 3.0?
Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
To implement ejbRemove in EJB 3.0 you will firstly need to import javax.ejb.Remove, then you can annotate the required method with @Remove. @Remove public...

How do I use the @PostConstruct annotation in EJB 3.0?
Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
You will firstly need to import javax.annotation.PostConstruct before you can use the annotation. Then annotate a method with @PostConstruct @Pos...

How do I use the @PreDestroy annotation in EJB 3.0?
Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
You will firstly need to import javax.annotation.PreDestroy before you can use the annotation. Then annotate a method with @PreDestroy @PreDestroy public...

How do I use the @PostActivate annotation in EJB 3.0?
Java:API:EJB:SessionBean:Stateful, Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
You will firstly need to import javax.ejb.PostActivate before you can use the annotation. Then annotate a method with @PostActivate @PostActivate public...

How do I use the @PrePassivate annotation in EJB 3.0?
Java:API:EJB:SessionBean:Stateful, Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
You will firstly need to import javax.ejb.PrePassivate before you can use the annotation. Then annotate a method with @PrePassivate @PrePassivate public...

How do you implement ejbCreate, ejbRemove, ejbActivate and ejbPassivate in EJB 3.0?
Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
There are 4 lifecycle callback methods available in EJB 3.0. They are specified by annotating a method with one of the lifecycle annotations. The annotations...

How do I create a statefull session bean with EJB 3.0?
Java:API:EJB:SessionBean:Stateful, Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
To create a statefull session bean you need to make use of the @Statefull annotation. You place the annotation on the line before the class declaration....

How do I create a stateless session bean with EJB 3.0?
Java:API:EJB:SessionBean:Stateless, Java:API:EJB:3.0
Byron Tymvios, Oct 4, 2006
To create a stateless session bean you need to make use of the @Stateless annotation. You place the annotation on the line before the class declaration....

When was Java EE 5 released?
Java:API:EJB
Byron Tymvios, Oct 2, 2006
May 16, 2006. See the press release at http://www.sun.com/smi/Press/sunflash/2006-05/sunflash.20060516.2.xml.

When was J2EE 1.2 released?
Java:API:EJB
John Zukowski PREMIUM, Apr 1, 2006
December 7, 1999. See the press release at http://www.sun.com/smi/Press/sunflash/1999-12/sunflash.991207.7.xml.

When was J2EE 1.3 released?
Java:API:EJB
John Zukowski PREMIUM, Apr 1, 2006
September 24, 2001. See the press release at http://www.sun.com/smi/Press/sunflash/2001-09/sunflash.20010924.i1.html.

When was J2EE 1.4 released?
Java:API:EJB
John Zukowski PREMIUM, Apr 1, 2006
April 26, 2004. See the press release at http://www.sun.com/smi/Press/sunflash/2004-04/sunflash.20040426.1.xml.

What kind of certification does JBoss offer?
Java:API:EJB, Certification:Java
John Zukowski PREMIUM, Oct 31, 2005
JBoss has a "Certified JBoss Developer" as its basic level. Additional levels are availalble. See http://www.jboss.org/services/certification for more...

What is GlassFish?
Java:API:Servlets, Java:API:EJB, Java:API:JavaMail
John Zukowski PREMIUM, Jul 29, 2005
The GlassFish Project is Sun's open source application server project. Found at https://glassfish.dev.java.net/, you can participate in the development...

Brief description on the 4 interfaces applicable to EJBs (Remote, Local, Home, LocalHome): when to use them and the differences between them?
Java:API:EJB
Sean Owen, Apr 28, 2004
The Remote and Home interfaces have somewhat misleading names, because both interfaces are used by the EJB client, which may be on a "remote" machine. You...

EJB and scalability EJB is scalable because it can run in cluster environment. What is there in EJB specification and in Application Server that supports this feature ?
Java:API:EJB
Satish Kumar Tedla, Jul 31, 2003
Capability is the current processing capability of an application. Like the No. of requests an application can handle with fair/good perfo...

Synchronization of Stateless Session bean instances. Is there anyway by which we can update/modify (not on server start up but at actual application run time) value of instance variables of ll stateless...
Java:API:EJB:SessionBean:Stateless
Nick Maiorano PREMIUM, Jun 23, 2003
Additional Note This is something related to snchronizing all the instances. If a user modify a variable in Stateless Session Bean can it be reflected...

What are the additional features of EJB 2.1 over EJB 2.0
Java:API:EJB:2.0
Alessandro A. Garbagnati PREMIUM, May 8, 2003
Compared to the 2.0 specifications, EJB 2.1 have focused the attention in trying to be more "web-services" oriented, and with the improving of some important...

What's difference between Servlet/JSP session and EJB session?
Java:API:EJB:SessionBean, Java:API:Servlets:Cookies, Sessions, and State Management
Alessandro A. Garbagnati PREMIUM, May 7, 2003
From a logical point of view, a Servlet/JSP session is similar to an EJB session. Using a session, in fact, a client can connect to a server and maintain...

why we use home interface in EJB. In RMI we dont have any concept like home interface.why we particularly go for Home Interface Both RMI and EJB are distributed applications. In EJB we use Home interface...
Java:API:EJB, Java:API:RMI
Nick Maiorano PREMIUM, May 5, 2003
By posing this question, you seem to be comparing RMI and EJB as if they were the same type of technology and they are definately not. RMI is a lower level...

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