JNDI lookup fails for client applications

Question

I am currently porting our j2ee application to weblogic 7.0. The application already
runs successfully on Orion and Jboss. I have got everything working now except
for our client applications, which all fail with a JNDI lookup error. The exception
is:
javax.naming.NameNotFoundException: Unable to resolve 'java:comp.env/ejb/QualiferInstance'
Resolved: '' Unresolved:'java:comp' ; remaining name 'java:comp.env
/ejb/QualifierInstance'
at weblogic.rmi.internal.BasicOutboundRequest.sendReceive(BasicOutbound
equest.java:109)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemote
ef.java:262)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemote
ef.java:229)
at weblogic.jndi.internal.ServerNamingNode_WLStub.lookup(Unknown Source
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:338)
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:333)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at BatchIndexer.main(BatchIndexer.java:89)
I have looked up numerous postings on various mailing lists describing similar
problems, but none of them give an explanation which helps me.
I am convinced that I have the ejb deployment descriptors correct because all
our JSPs, servlets and session beans successfully lookup and use the EJBs.
I am also convinced that I have the correct code for the JNDI lookup in our client
applications, because they work perfectly well on Orion and Jboss and use syntax
which is described as correct in the jsee specification, i.e. "java:comp/env/..."
Here is the descriptor from weblogic-ejb-jar.xml for the EJB mentioned in the
example exception above:
<weblogic-enterprise-bean>
<ejb-name>QualifierInstance</ejb-name>
<jndi-name>comp/env/ejb/QualifierInstance</jndi-name>
</weblogic-enterprise-bean>
And here is the descriptor in the application-client.xml file:
     <ejb-ref>
          <ejb-ref-name>ejb/QualifierInstance</ejb-ref-name>
          <ejb-ref-type>Entity</ejb-ref-type>           <home>com.espritsoutron.xengine.ejb.metamodel.QualifierInstanceHome</home>
          <remote>com.espritsoutron.xengine.ejb.metamodel.QualifierInstance</remote>
          <ejb-link>QualifierInstance</ejb-link>
     </ejb-ref>
And here is the code in the client application that attempts to perform the lookup:
qiHome = (QualifierInstanceHome)PortableRemoteObject.narrow(context.lookup("java:comp/env/ejb/QualifierInstance"),
QualifierInstanceHome.class);
The annoying thing is that I know I can make this work if I change the code to
omit the "java:" prefix, but I don't want to do this because then it would no
longer work on either Orion and Jboss.
P.S. I have also tried changing the jndi-name in the weblogic-ejb-jar descriptor
to "ejb/QualifierInstance" and just "QualifierInstance", but neither of these
make any difference. I even tried chaning it to "java:comp/env/ejb/QualifierInstance"
but that totally breaks the server.
Can anyone can please help with this?

Answer 1

you can find the JNDI name in the JNDI tree from the admin console
right click on your server and choose "view jndi tree".
if you bind your ejb to ejb/QualifierInstance
you look it up with that exact same name ejb/QualifierInstance
Julian Fawcett wrote:
I am currently porting our j2ee application to weblogic 7.0. The application already
runs successfully on Orion and Jboss. I have got everything working now except
for our client applications, which all fail with a JNDI lookup error. The exception
is:
javax.naming.NameNotFoundException: Unable to resolve 'java:comp.env/ejb/QualiferInstance'
Resolved: '' Unresolved:'java:comp' ; remaining name 'java:comp.env
/ejb/QualifierInstance'
at weblogic.rmi.internal.BasicOutboundRequest.sendReceive(BasicOutbound
equest.java:109)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemote
ef.java:262)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemote
ef.java:229)
at weblogic.jndi.internal.ServerNamingNode_WLStub.lookup(Unknown Source
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:338)
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:333)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at BatchIndexer.main(BatchIndexer.java:89)
I have looked up numerous postings on various mailing lists describing similar
problems, but none of them give an explanation which helps me.
I am convinced that I have the ejb deployment descriptors correct because all
our JSPs, servlets and session beans successfully lookup and use the EJBs.
I am also convinced that I have the correct code for the JNDI lookup in our client
applications, because they work perfectly well on Orion and Jboss and use syntax
which is described as correct in the jsee specification, i.e. "java:comp/env/..."
Here is the descriptor from weblogic-ejb-jar.xml for the EJB mentioned in the
example exception above:
<weblogic-enterprise-bean>
<ejb-name>QualifierInstance</ejb-name>
<jndi-name>comp/env/ejb/QualifierInstance</jndi-name>
</weblogic-enterprise-bean>
And here is the descriptor in the application-client.xml file:
     <ejb-ref>
          <ejb-ref-name>ejb/QualifierInstance</ejb-ref-name>
          <ejb-ref-type>Entity</ejb-ref-type>           <home>com.espritsoutron.xengine.ejb.metamodel.QualifierInstanceHome</home>
          <remote>com.espritsoutron.xengine.ejb.metamodel.QualifierInstance</remote>
          <ejb-link>QualifierInstance</ejb-link>
     </ejb-ref>
And here is the code in the client application that attempts to perform the lookup:
qiHome = (QualifierInstanceHome)PortableRemoteObject.narrow(context.lookup("java:comp/env/ejb/QualifierInstance"),
QualifierInstanceHome.class);
The annoying thing is that I know I can make this work if I change the code to
omit the "java:" prefix, but I don't want to do this because then it would no
longer work on either Orion and Jboss.
P.S. I have also tried changing the jndi-name in the weblogic-ejb-jar descriptor
to "ejb/QualifierInstance" and just "QualifierInstance", but neither of these
make any difference. I even tried chaning it to "java:comp/env/ejb/QualifierInstance"
but that totally breaks the server.
Can anyone can please help with this?