EJB called via JNDI in a Repository Service :: ClassCastException

Question

Hi SDN,
I've got a problem in calling an EJB from a Repository Service...
Here the steps I've follow:
  -  An EJB has been created with some Business Methods in it; it has been packaged in an EAR and deployed;
  -  This EJB is looked up succesfully via JNDI in a WDJ application and also in an Abstract Portal Component; I use the following guides:
[Accessing EJB Apps using JNDI|http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/0736159e-0301-0010- 9ea4-c63d83d0797b?QuickLink=index&overridelayout=true]
[Referencing an EJB in an Abstract Portal Component|http://wiki.sdn.sap.com/wiki/display/HOME/ConnectingEJBUsing ExternalJars]
  -  A Repository Service has been created and registered on "CREATE_CHILD_TEMPLATE" ResourceEvent; I can see from logs that this service works correctly;
   -  I've copied in the PAR lib and private/lib folders two jars (ejb20.jar and the JAR created building the EJB) and they are added to the build path;
  -  If I try to look up the EJB via JNDI in the received service method, I get a ClassCastException...
Here some code:
try {
     //I use System.err to see log in the Default Trace
     System.err.println("Initialize EJB");
     //TestJNDIHome class seems to be visible at runtime, following instruction does not throw any exception
     System.err.println("ToString TestJNDIHome: " + TestJNDIHome.class.toString());
     //EJB and PAR are on the same J2EE engine, so no InitialContext parameters, I'm right?
     InitialContext context = new InitialContext();
     Object jndiobj = context.lookup("altevie.com/testear/TestJNDIBean");
     System.err.println("Classe oggetto recuperato da lookup: " + jndiobj.getClass());
     TestJNDIHome home = (TestJNDIHome) javax.rmi.PortableRemoteObject.narrow(jndiobj, TestJNDIHome.class);
     testJNDI = home.create();
} catch (NamingException ex) {
     System.err.println("NamingException :: " + ex.getLocalizedMessage());
} catch (RemoteException ex) {
     System.err.println("RemoteException :: " + ex.getLocalizedMessage());
} catch (CreateException ex) {
     System.err.println("CreateException :: " + ex.getLocalizedMessage());          
Here the portalapp.xml (in the same PAR there are two objects, the Repository Service and an Abstract Portal Component, but I've got the same problem also removing the Abstract Portal Component...):
<application>
  <application-config>
    <property name="com.sap.engine.interfaces.cross.ObjectReferenceImpl" value="SAPJ2EE::altevie.com/testEAR"/>
    <property name="SharingReference" value="usermanagement, knowledgemanagement, landscape, htmlb, exportalJCOclient, exportal"/>
    <property name="PrivateSharingReference" value="SAPJ2EE::altevie.com/testEAR"/>
  </application-config>
  <components>
    <component name="TestJSP">
      <component-config>
        <property name="ClassName" value="com.comer.eps.epcomp.TestJSP"/>
      </component-config>
      <component-profile/>
    </component>
  </components>
  <services>
    <service name="RFServiceWrapper">
      <service-config>
        <property name="className" value="com.sap.netweaver.rf.wrapper.RFServiceWrapper"/>
        <property name="startup" value="true"/>
      </service-config>
    </service>
  </services>
</application>
javax.rmi.PortableRemoteObject.narrow method call throws a ClassCastException...
From the previous println I can see the lookup method returns a com.sap.engine.interfaces.cross.ObjectReferenceImpl object, I do not know if it is correct...
I've tried to lookup the Local (localejbs/altevie.com/testear/TestJNDIBean) and Remote (altevie.com/testear/TestJNDIBean) JNDI Bean name, but I get the same error...
I'm sure the JNDI name is correct (it works with WDJ and Abstract Portal Component... I've also tested via LOOKUP command using telnet to connect to J2EE AS and I've checked JNDI Registry and EJB Container services in Visual Admin)...
Here the stack trace of the error:
java.lang.ClassCastException: com.comer.eps.ejb.AccessiEJBHome
     at com.sap.engine.services.cross.PortableRemoteObjectContainer.narrow(PortableRemoteObjectContainer.java:179)
     at com.sap.engine.system.PortableRemoteObjectProxy.narrow(PortableRemoteObjectProxy.java:24)
     at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
     at com.comer.eps.repsrv.onsave.RipubblicaByDE.initializeEJB(RipubblicaByDE.java:145)
Can you help me? Why JNDI lookup works in an Abstract Portal Application and doesn't in a Repository Service (same code...)?
Thank you so much and best regards,
Manuel
Text Formatted: Manuel Xiccato on Sep 27, 2011 12:29 PM

Answer 1

Hi SDN,
I've got a problem in calling an EJB from a Repository Service...
Here the steps I've follow:
  -  An EJB has been created with some Business Methods in it; it has been packaged in an EAR and deployed;
  -  This EJB is looked up succesfully via JNDI in a WDJ application and also in an Abstract Portal Component; I use the following guides:
[Accessing EJB Apps using JNDI|http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/0736159e-0301-0010- 9ea4-c63d83d0797b?QuickLink=index&overridelayout=true]
[Referencing an EJB in an Abstract Portal Component|http://wiki.sdn.sap.com/wiki/display/HOME/ConnectingEJBUsing ExternalJars]
  -  A Repository Service has been created and registered on "CREATE_CHILD_TEMPLATE" ResourceEvent; I can see from logs that this service works correctly;
   -  I've copied in the PAR lib and private/lib folders two jars (ejb20.jar and the JAR created building the EJB) and they are added to the build path;
  -  If I try to look up the EJB via JNDI in the received service method, I get a ClassCastException...
Here some code:
try {
     //I use System.err to see log in the Default Trace
     System.err.println("Initialize EJB");
     //TestJNDIHome class seems to be visible at runtime, following instruction does not throw any exception
     System.err.println("ToString TestJNDIHome: " + TestJNDIHome.class.toString());
     //EJB and PAR are on the same J2EE engine, so no InitialContext parameters, I'm right?
     InitialContext context = new InitialContext();
     Object jndiobj = context.lookup("altevie.com/testear/TestJNDIBean");
     System.err.println("Classe oggetto recuperato da lookup: " + jndiobj.getClass());
     TestJNDIHome home = (TestJNDIHome) javax.rmi.PortableRemoteObject.narrow(jndiobj, TestJNDIHome.class);
     testJNDI = home.create();
} catch (NamingException ex) {
     System.err.println("NamingException :: " + ex.getLocalizedMessage());
} catch (RemoteException ex) {
     System.err.println("RemoteException :: " + ex.getLocalizedMessage());
} catch (CreateException ex) {
     System.err.println("CreateException :: " + ex.getLocalizedMessage());          
Here the portalapp.xml (in the same PAR there are two objects, the Repository Service and an Abstract Portal Component, but I've got the same problem also removing the Abstract Portal Component...):
<application>
  <application-config>
    <property name="com.sap.engine.interfaces.cross.ObjectReferenceImpl" value="SAPJ2EE::altevie.com/testEAR"/>
    <property name="SharingReference" value="usermanagement, knowledgemanagement, landscape, htmlb, exportalJCOclient, exportal"/>
    <property name="PrivateSharingReference" value="SAPJ2EE::altevie.com/testEAR"/>
  </application-config>
  <components>
    <component name="TestJSP">
      <component-config>
        <property name="ClassName" value="com.comer.eps.epcomp.TestJSP"/>
      </component-config>
      <component-profile/>
    </component>
  </components>
  <services>
    <service name="RFServiceWrapper">
      <service-config>
        <property name="className" value="com.sap.netweaver.rf.wrapper.RFServiceWrapper"/>
        <property name="startup" value="true"/>
      </service-config>
    </service>
  </services>
</application>
javax.rmi.PortableRemoteObject.narrow method call throws a ClassCastException...
From the previous println I can see the lookup method returns a com.sap.engine.interfaces.cross.ObjectReferenceImpl object, I do not know if it is correct...
I've tried to lookup the Local (localejbs/altevie.com/testear/TestJNDIBean) and Remote (altevie.com/testear/TestJNDIBean) JNDI Bean name, but I get the same error...
I'm sure the JNDI name is correct (it works with WDJ and Abstract Portal Component... I've also tested via LOOKUP command using telnet to connect to J2EE AS and I've checked JNDI Registry and EJB Container services in Visual Admin)...
Here the stack trace of the error:
java.lang.ClassCastException: com.comer.eps.ejb.AccessiEJBHome
     at com.sap.engine.services.cross.PortableRemoteObjectContainer.narrow(PortableRemoteObjectContainer.java:179)
     at com.sap.engine.system.PortableRemoteObjectProxy.narrow(PortableRemoteObjectProxy.java:24)
     at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
     at com.comer.eps.repsrv.onsave.RipubblicaByDE.initializeEJB(RipubblicaByDE.java:145)
Can you help me? Why JNDI lookup works in an Abstract Portal Application and doesn't in a Repository Service (same code...)?
Thank you so much and best regards,
Manuel
Text Formatted: Manuel Xiccato on Sep 27, 2011 12:29 PM