Problems using the Java API inside a Web Service

Hi,
after I've built a standalone Java RMI client, using the API, I wanted to use the same code in a Web Service I've built and deployed in tomcat (jwsdp-1.3). But i ran into a few problems..
- although I have the exact same code in both programs, the one in the web service simply blocks when I initiate the Locator class (see above...);
- all the .jar's that I use in the client are deployed in the WEB-IF/lib of the web service directory on tomcat;
- no exceptions are thrown in tomcat, so i don't know what's going on;
Is there any specific configuration for the API to run on tomcat?
Could it be that the .jar's needed by the Locator class may have some kind of conflict with the ones in tomcat?
Thanks...
Note: The code on the client is totaly stable and fully operational.
The web service uses java.rmi.Remote (extends Remote).
Here's part of the code:
Properties env = new Properties();
env.setProperty("orabpel.platform", "oc4j_10g");
env.setProperty("java.naming.factory.initial","com.evermind.server.rmi.RMIInitialContextFactory");
env.setProperty("java.naming.provider.url","ormi://dellpc05/orabpel");
env.setProperty("java.naming.security.principal","admin");
env.setProperty("java.naming.security.credentials","welcome");
Locator locator = new Locator("default", "bpel", env);
IDeliveryService deliveryService = (IDeliveryService)locator.lookupService(IDeliveryService.SERVICE_NAME );
(...)

I've put a
try{Locator...}
}catch(Throwable t) {
System.out.println(t.getMessage());
t.printStackTrace();
around the Locator..
I still don't know why it's throwing this...
Here's what it gets:
before Locator
javax/jms/JMSException
java.lang.NoClassDefFoundError: javax/jms/JMSException
 at com.evermind.server.ThreadState.getCurrentState(ThreadState.java:206)
 at com.evermind.server.rmi.RMIConnection.checkServletCaller(RMIConnection.java:3448)
 at com.evermind.server.rmi.RMIConnection.<init>(RMIConnection.java:181)
 at com.evermind.server.rmi.RMIServer.addNode(RMIServer.java:856)
 at com.evermind.server.rmi.RMIServer.getConnection(RMIServer.java:953)
 at com.evermind.server.rmi.RMIInitialContextFactory.getInitialContext(RMIInitialContextFactory.java:309)
 at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:662)
 at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
 at javax.naming.InitialContext.init(InitialContext.java:219)
 at javax.naming.InitialContext.<init>(InitialContext.java:195)
 at com.collaxa.cube.util.CXBeanRegistry.lookupDomainManagerBean(CXBeanRegistry.java:205)
 at com.oracle.bpel.client.auth.DomainAuthFactory.authenticate(DomainAuthFactory.java:84)
 at com.oracle.bpel.client.Locator.<init>(Locator.java:120)
 at com.oracle.bpel.client.Locator.<init>(Locator.java:91)
 at dmc.tm.resultprovider.ResultProviderImpl$ResultProviderThread.taskTimeoutExceeded(ResultProviderImpl.java:231)
 at dmc.tm.resultprovider.ResultProviderImpl$ResultProviderThread.run(ResultProviderImpl.java:160)

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