Access datasource from standalone application using weblogic 9.0 getting exception

[ashok bantu]

javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalException: failed to unmarshal class weblogic.security.acl.internal.AuthenticatedUser; nested exception is:
java.io.StreamCorruptedException: invalid type code: 31]
at weblogic.jndi.internal.ExceptionTranslator.toNamingException(ExceptionTranslator.java:84)
at weblogic.jndi.internal.ExceptionTranslator.toNamingException(ExceptionTranslator.java:40)
at weblogic.jndi.WLInitialContextFactoryDelegate.toNamingException(WLInitialContextFactoryDelegate.java:739)
at weblogic.jndi.WLInitialContextFactoryDelegate.pushSubject(WLInitialContextFactoryDelegate.java:639)
at weblogic.jndi.WLInitialContextFactoryDelegate.newContext(WLInitialContextFactoryDelegate.java:440)
at weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialContextFactoryDelegate.java:353)
at weblogic.jndi.Environment.getContext(Environment.java:257)
at weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFactory.java:117)
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.InitialContext.<init>(Unknown Source)
at Conpool.main(Conpool.java:26)
Caused by: java.rmi.UnmarshalException: failed to unmarshal class weblogic.security.acl.internal.AuthenticatedUser; nested exception is:
java.io.StreamCorruptedException: invalid type code: 31
at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:199)
at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:155)
at weblogic.common.internal.RMIBootServiceImpl_900_WLStub.authenticate(Unknown Source)
at weblogic.security.acl.internal.Security$1.run(Security.java:185)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
at weblogic.security.acl.internal.Security.authenticate(Security.java:181)
at weblogic.jndi.WLInitialContextFactoryDelegate.authenticateRemotely(WLInitialContextFactoryDelegate.java:700)
at weblogic.jndi.WLInitialContextFactoryDelegate.pushSubject(WLInitialContextFactoryDelegate.java:633)
... 9 more
Caused by: java.io.StreamCorruptedException: invalid type code: 31
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:195)
at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:539)
at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:191)
at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:62)
at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:197)
... 17 more



can any one help on this