Fails to create a Statement object on the obtained datasource connection.
Fails at: Statement stmt = conn.createStatement();

Below is the exception stack trace

java.lang.NullPointerException
at java.lang.reflect.Proxy.getProxyClass(Proxy.java:326)
at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:552)
at org.jboss.proxy.GenericProxyFactory.createProxy(GenericProxyFactory.java:145)
at org.jboss.proxy.GenericProxyFactory.createProxy(GenericProxyFactory.java:61)
at org.jboss.resource.adapter.jdbc.remote.WrapperDataSourceService.createStatementProxy(WrapperDataSourceService.java:519)
at org.jboss.resource.adapter.jdbc.remote.WrapperDataSourceService.doConnectionMethod(WrapperDataSourceService.java:366)
at org.jboss.resource.adapter.jdbc.remote.WrapperDataSourceService.invoke(WrapperDataSourceService.java:211)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:260)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
at org.jboss.invocation.jrmp.server.JRMPInvoker$MBeanServerAction.invoke(JRMPInvoker.java:819)
at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:420)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:534)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:133)
at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:348)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:197)
at org.jboss.proxy.ClientMethodInterceptor.invoke(ClientMethodInterceptor.java:74)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:100)
at $Proxy2.createStatement(Unknown Source)
at org.jboss.test.jca.test.SecurityContextUnitTestCase.testCallerIdentityPropagation(SecurityContextUnitTestCase.java:68)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.extensions.TestSetup.run(TestSetup.java:23)

Test results can be found here:
http://cruisecontrol.jboss.com/cc/artifacts/jboss-4.0-testsuite/20060308010418/results/index.html