Sun One EJB problem - PortableRemoteObject.narrow ClassCastException...

Hi all,
I'm using Sun One app server 7 for the first time and am having a bit of difficulty. I have deployed a very simple EAR containing one stateless session bean just to test it. The ear appears to have deployed correctly but PortableRemoteObject.narrow is throwing a ClassCastException when trying to do a remote lookup on the bean.
I'm using the following env settings...
initialContextFactory = com.sun.enterprise.naming.SerialInitContextFactory
providerUrl = iiop://127.0.0.1:3700The lookup appears to work okay - this line of code executes successfully
Object objref = initialContext.lookup(jndiHomeName);...objref appears to initalise succesfully (if I toString() it I get an iiop stream of some sort). However, it is the next line that is failing...
Object obj = PortableRemoteObject.narrow(objref, homeClass);...this is the exception I get...
java.lang.ClassCastException
     at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(Unknown Source)
     at javax.rmi.PortableRemoteObject.narrow(Unknown Source)
     at com.scorlog.ServiceLocator.getRemoteHome(ServiceLocator.java:145)Furthermore, when PortableRemoteObject.narrow() executes, I get the following console exception on the server...
com.sun.corba.ee.internal.core.DuplicateServiceContext
        at com.sun.corba.ee.internal.core.ServiceContexts.put(ServiceContexts.java:208)
        at com.sun.corba.ee.internal.iiop.ServerRequestImpl.getServiceContextsForReply(ServerRequestImpl.java:258)
        at com.sun.corba.ee.internal.iiop.ServerRequestImpl.createResponse(ServerRequestImpl.java:89)
        at com.sun.corba.ee.internal.POA.SubcontractResponseHandler.createReply(SubcontractResponseHandler.java:50)
        at org.omg.CosNaming.NamingContextExtPOA._invoke(NamingContextExtPOA.java:377)
        at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatchToServant(GenericPOAServerSC.java:569)
        at com.sun.corba.ee.internal.POA.GenericPOAServerSC.internalDispatch(GenericPOAServerSC.java:211)
        at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatch(GenericPOAServerSC.java:113)
        at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:275)
        at com.sun.corba.ee.internal.iiop.RequestProcessor.process(RequestProcessor.java:83)
        at com.iplanet.ias.corba.ee.internal.iiop.ServicableWrapper.service(ServicableWrapper.java:25)
        at com.iplanet.ias.util.threadpool.FastThreadPool$ThreadPoolThread.run(FastThreadPool.java:288)
        at java.lang.Thread.run(Thread.java:534)
FINE: No SAS context element found in service context listI have seen the forum that other users have had similar problems and the suggestion was that the client can't see the ejb stubs. I don't think this is the problem in my case as I deployed the same ear on weblogic 7 (obviously substituting sun-ejb-jar.xml for a weblogic-ejb-jar.xml) and successfully executed the same client code for the remote lookup.
My feeling is that the problem revolves around the JNDI binding. Could it be the case that even though the object is binding properly, the app server doesn't realise it is an ejb and not a jdbc/jms/mail object? The documentation gives details on looking up a JDBC, javamail, URL, JMS resource (http://docs.sun.com/source/817-2177/djjndi.html) but not ejb so I could be doing something simple wrong here...
My sun-ejb-jar.xml is as follows....
<?xml version="1.0" encoding="UTF-8"?>

<sun-ejb-jar>
    <enterprise-beans>
        <ejb>
            <ejb-name>SBTest</ejb-name>
            <jndi-name>ejb/SBTestBean</jndi-name>
        </ejb>
    </enterprise-beans>
</sun-ejb-jar>However, I noticed on another thread, a user had some additional elements under their <ejb> tag like this...
<?xml version="1.0" encoding="UTF-8"?>
<sun-ejb-jar>
<enterprise-beans>
    <name>Ejb1</name>
    <ejb>
      <ejb-name>HelloBean</ejb-name>
      <jndi-name>HelloBean</jndi-name>
      <ejb-ref>
        <ejb-ref-name>ejb/helloBean</ejb-ref-name>
        <jndi-name>HelloBean</jndi-name>
      </ejb-ref>
    </ejb>
</enterprise-beans>
</sun-ejb-jar>However, when I tried to add and <ejb-ref> element to my xml doc the ear failed to deploy. This is the error I get in the admin console...
Error
Deployment Error -- Error while running ejbc -- Fatal Error from EJB Compiler -- --
Failed to load deployment descriptor for: testApp cause: Error converting J2EE-
specific ejb xml to object representation: testApp.jar app_testApp Generated by
XDoclet This bean has no ejb reference by the name of [ejb/SBtest]
ejb/SBTestSBTestThis problem is eating up my time and being made all the more frustrating by the fact that a) it deploys on weblogic and b) the documentation is terrible. Even the sample application that comes with sun one only provides the .class files for the code that does the ejb look up and not the .java so you can't see how they hell they do it!
Unfortunately I am tied to using Sun One so I really need to solve this problem fast. If anyone can provide any help I'd greatly appreciate it.
Cheers,
John :)

I am having the same problem after upgrading to Sun One from iplanet. Any clue?

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"Sandy Barletta" <[email protected]> wrote in message
news:[email protected]...
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I have same problem in Java Web Start.
This Situation is same.
I report the result of my investigation.
I'm having a problem in lookup remote object when using JWS.
My application runs normally in Java Application without JWS.
I'm using BEA WebLogic Server 6.1.
My application acts in EJB client application.
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When I cast remote object to my interface, I encountered this kind of error.
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at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow
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ok
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Hep, we have the same problem. I am still trying to figure out why. I have some idea about the reason but I am testing my founding. It seems to me that the problem shows up when I add my database driver in Runtime/Databases/drivers tree (IBM DB2 driver: db2jcc.jar)
Like I am saying I am still checking the connection. When I am convinced that indeed that is the problem, I will then try to find out why and what to do to make my life easier.
clogon

Remote Interface problem using Sun ONE App & web server

HI,
1) I am using an S'less SB. I have local & remote interfaces. I am using the sun one appserver7 & the sun ones's htttp server. By default it doesnt pick up the remote interfaces is it ? How do i make my remote interfaces work ? what are the changes required in config/xml ?
2) However i changed my client code (i.e my action class which is called by the struts action servlet ) to access the localhome rather than the remote home, but then i get java.lang.classcastexception.
pls help !
sanjay

Hi parsuram,
Thanks for the tip. After looking at the sample source code, I did finally figure out the solution - so I'll post it in case anyone else happens to be working with websphere studio has the same issue deploying on sun one.
To access local interface ejb, you must have the following
1. ejb-local-ref tag in the ejb-jar.xml like so underneath the <session> or <entity> tag of the bean which you plan to access the local ejb with.
<ejb-local-ref>
<ejb-ref-name>TestL</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home>memory.simple.TestLLocalHome</local-home>
<local>memory.tool.simple.TestLLocal</local>
<ejb-link>TestL</ejb-link>
</ejb-local-ref>
2. similar ejb-ref tag in sun-ejb-jar.xml
<ejb-ref>
<ejb-ref-name>TestL</ejb-ref-name>
<jndi-name>localejbs/module_memory.betaEJB/TestL68640023372300293</jndi-name>
</ejb-ref>
note: sun generates the <jndi-name> and overwrites whatever you put in that tag no matter what you put in there.
3. here is the code to access
Context initial = new InitialContext();
TestLLocalHome tlHome=(TestLLocalHome) Initial.lookup
("TestL");
//the string must match <ejb-ref-name> underneath <ejb-local-ref>
4. note that the jndi name for the local interface bean becomes irrelevant. only the <ejb-ref-name> in the ejb-jar and sun-ejb-jar matter. furthermore, both <ejb-ref-name> must be the same or you won't be able to deploy.
5. This is completely my fault for not checking the "proper" way to access local interfaces. in websphere, they let you get away without the ejb-ref tags and just use the string "local:/TestL"!
-matt

PortableRemoteObject.narrow Problem

Hello, I have a jsp that is talking to a servlet that is suppose to connect to a stateless session bean in 9.0.3. The bean deploys fine. I continue to get the following error when the servlet tries to talk to the bean. The servlet works fine on JRun 4 talking to the same bean. Here is my code.
Hashtable env = new Hashtable();
env.put(Context.PROVIDER_URL, "ormi://141.254.22.145:23791/JRun2");
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "admin");
env.put(Context.URL_PKG_PREFIXES, "com.evermind.naming");
Context context = new InitialContext(env);
System.out.println("context: " + context.getEnvironment().toString());
Object o = (Object) context.lookup("SessionManagerLiteStateless");
System.out.println("o: " + o.toString());
sessionManagerLiteStatelessHome = (SessionManagerLiteStatelessHome)PortableRemoteObject.narrow(o, SessionManagerLiteStatelessHome.class);
The context outputs the Home interface fine but it bombs on sessionManagerLiteStatelessHome = (SessionManagerLiteStatelessHome)PortableRemoteObject.narrow(o, SessionManagerLiteStatelessHome.class);
Here is the error.
java.lang.ClassCastException
at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(Unkno
wn Source)
at javax.rmi.PortableRemoteObject.narrow(Unknown Source)
at JRun2.OracleServlet.init(OracleServlet.java:30)
at com.evermind.server.http.HttpApplication.loadServlet(HttpApplication.
java:1956)
at com.evermind.server.http.HttpApplication.findServlet(HttpApplication.
java:4355)
at com.evermind.server.http.HttpApplication.getRequestDispatcher(HttpApp
lication.java:2184)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpReques
tHandler.java:617)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.ja
va:259)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.ja
va:106)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExec
utor.java:803)
at java.lang.Thread.run(Unknown Source)

Michael -
That looks like a correct set of calls to me.
Can I ask what environment are you running in? An OC4J standalone or a 9iAS environment?
** If this is a 9iAS environment, then the port number for the ORMI lookup will be different than 23791. The actual ORMI port number for a 9iAS instance is dynamically allocated when the OC4J processes are started. The defdault port ranges for ORMI are 3000-3100 by default. The process manager starts at the lower bound and works it's way sequentially along until a free port is found. So usually for the OC4J_Home instance, the ORMI port is 3000.
I've never used the URL_PKG_PREFIXES myself, what happens if you remove that entry for the Hashtable?
-steve-

Problem calling entity bean from session bean using sun one app server

Hi,
I am getting the following exception while calling entity bean(bmp) from stateless session(cmp)bean.
SEVERE: IOP5012: Some runtime exception ocurred in IIOP: [javax.ejb.EJBException: nested exception is: java.lang.RuntimeException: Unable to create reference org.omg.CORBA.OBJ_ADAPTER: vmcid: SUN minor code: 1015 completed: No]
SEVERE: IOP5013: Unable to create reference: [org.omg.CORBA.OBJ_ADAPTER: vmcid: SUN minor code: 1015 completed: No]
SEVERE: EJB5029: Exception getting ejb context : [CustomerEJB]
SEVERE:
WARNING: CORE3283: stderr: javax.transaction.TransactionRolledbackException: CORBA TRANSACTION_ROLLEDBACK 9998 Maybe; nested exception is:
WARNING: CORE3283: stderr: org.omg.CORBA.TRANSACTION_ROLLEDBACK: vmcid: 0x2000 minor code: 1806 completed: Maybe
WARNING: CORE3283: stderr: at com.sun.corba.ee.internal.iiop.ShutdownUtilDelegate.mapSystemException(ShutdownUtilDelegate.java:114)
WARNING: CORE3283: stderr: at com.sun.corba.ee.internal.javax.rmi.CORBA.Util.wrapException(Util.java:358)
WARNING: CORE3283: stderr: at javax.rmi.CORBA.Util.wrapException(Util.java:277)
WARNING: CORE3283: stderr:
My primary key implementation is
public class CustomerEJBKey implements java.io.Serializable {
static final long serialVersionUID = 3206093459760846163L;
public String customerId;
public DBConfigBean dbConfigBean;
* Creates an empty key for Entity Bean: CustomerEJB
/*public CustomerEJBKey() {
public CustomerEJBKey(String customerId,DBConfigBean dbConfigBean){
this.customerId = customerId;
this.dbConfigBean = dbConfigBean;
public String getCustomer(){
return customerId;
public DBConfigBean getDBConfigBean(){
return dbConfigBean;
* Returns true if both keys are equal.
public boolean equals(Object key) {
if(key instanceof CustomerEJBKey)
return this.customerId.equals(((CustomerEJBKey)key).customerId) &&
this.dbConfigBean.equals(((CustomerEJBKey)key).dbConfigBean);
else
return false;
* Returns the hash code for the key.
public int hashCode() {
return customerId.hashCode() + dbConfigBean.hashCode();
and entity bean method invocation is,
homeFactory = EJBHomeFactory.getInstance();
home = (CustomerEJBHome) homeFactory.lookup(CustomerEJBHome.class);
remote = (CustomerEJB) PortableRemoteObject.narrow( home.findByPrimaryKey(new CustomerEJBKey(customerId,dbBean)), CustomerEJB.class);
This works fine in Websphere and JBoss. Do you have any idea why I am getting this exception?
Appreciate your response.
Regards,
Sankar.

My suggestion is to put some System.out.println() statements and see if the output helps in any way in debugging. I can't think of anything on the top of my head although I have been working lightly on SunONE.
By the way, you referred the stateless bean as CMP. Just wanted to tell you that you are wrong. The terms CMP and BMP refer to persistence, which is applied to Database tables and not to stateless/stateful session beans which are written for some specific purpose independent of underlying database.

Sun One EJB problem - PortableRemoteObject.narrow ClassCastException...

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