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11
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Last Post:
Jul 18, 2007 12:09 PM
Last Post By: karthequian
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21
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10.1.3.1 Looking up a session EJB with DI from the Web tier
Posted:
Nov 24, 2006 2:17 AM
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Hi,
I am trying to use Dependency Injection in a class located in the Web tier.
I use the @EJB annotation but when I try to access the session bean in the code, it is a null pointer.
I have not modified any deployment descriptor. The bean is well present in the JNDI tree, with a name like <EJBmodulename>_<EJBimplementation classname> and if I do a JNDI lookup with that name, it works fine but I would like to use the Resource Injection.
I have tried to find such an example in the how-to's and in the documentation without success.
I am using Eclipse and OC4J 10.1.3.1. The EJB module descriptor is v3.0 and the Web module descriptor is v2.5 so I dont use the Jdeveloper wizardry here.
Robin
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Posts:
1,920
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Nov 24, 2006 1:42 PM
in response to: mulkers
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Nov 29, 2006 12:32 AM
in response to: Steve Button
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No it does not.
I am trying to reproduce my problem with your example, I am removing the persistency stuff which does not work in my environment.
I am wondering why, in this example, the EJB-JAR file is present as a module of the J2EE application in the EAR file but is also copied as a simple JAR file in the WEB-INF/lib of the WAR module?
I don't see a reason for this.
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Nov 29, 2006 3:01 AM
in response to: mulkers
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So Dependency Injection (@EJB annotation) does work in the Web tier only if this annotation is located in a Servlet.
If the @EJB is located in a POJO located in WEB-INF/classes, the @EJB annotation is currently not resolved and is null.
I've extended the example provided here http://www.oracle.com/technology/tech/java/oc4j/10131/how_to/how-to-di-from-web/doc/how-to-di-from-web.html
with a POJO acting as an intermediary between the servlet and the EJB to illustrate the problem. I can send you this EAR file if needed.
This problem is annoying, it prevents, for example, the use of @EJB annotations in a framework like Struts.
Any clue if this is a bug and when it will be solved?
Robin |
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Nov 29, 2006 2:02 PM
in response to: mulkers
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I'll check this out for you, please send me the ear file if possible.
steve [.] button [@] oracle [.] com
cheers
-steve-
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Posts:
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Jan 14, 2007 11:29 PM
in response to: mulkers
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A final word to close this issue.
DI works only in "container managed classes" like servlets, EJBs, etc etc
If we try to do DI in a simple Java class, the container will not resolve the DI.
According to Oracle support, this behaviour is explicitely described in the J2EE 5 specification.
If you have a look at the J2EE 5 spec, the classes where DI is supported are listed on page 64.
Component classes supporting injection
Servlet: servlets, servlet filters, event listeners
JSP: tag handlers, tag library event listeners
JSF: scoped managed beans
JAX-WS: service endpoints, handlers
EJB: beans, interceptors
Java EE platform: main class (static), login callback handler
So here, we are in a situation where the Oracle implementation works in line with the spec but this feature is useless in a lot of cases. Who is still writing servlets today?
I would prefer to see Oracle suggesting an extension to that spec in order to support DI from any kind of class.
Best regards.
Robin Mulkers
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Posts:
78
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12/14/06
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Jan 16, 2007 7:50 AM
in response to: mulkers
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I am still getting NULL when I use DI in JSF managed bean.
Did anybody make it work in managed bean???
-Rama
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586
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Jan 16, 2007 10:27 AM
in response to: Raam
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Support of injection in JSF managed bean is part of JSF 1.1 and OC4J 10.1.3.1 does not support JSF 1.1.
regards
Debu
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Jan 16, 2007 10:30 AM
in response to: mulkers
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We are process of adding our own extensions support injection in regular Java class and will be available in a future release of OC4J and we will work with next Java EE spec to make sure that this limitation is addressed
regards
Debu
http://debupanda.com
http://manning.com/panda - EJB 3 In Action |
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Jan 16, 2007 12:22 PM
in response to: debabrata.panda...
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Great news Debu, thanks.
I am looking forward for that feature in a next release.
Best regards.
Robin
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Posts:
22
Registered:
07/17/07
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Re: 10.1.3.1 Looking up a session EJB with Resource Injection from the Web
Posted:
Jul 18, 2007 12:09 PM
in response to: debabrata.panda...
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Hey Debu,
I'm curious to see if this issue has been fixed in OC4J 10.3.2? I ran your ActionBazaar example (Chapter 12) from EJB in Action and it worked great; I used the same implementation as you had provided (Facade, EAO etc) but used the the myFaces implementation of JSF (MyFaces 1.1.4 with Facelets).
I tried an injection from a managed bean, but I always have a null stateless session bean.
Any ideas?
Thanks,
-K
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