I am trying to make an RMIAdaptor call from JBoss 4.0.0 to JBoss 3.2.5. However, when I lookup the RMIAdaptor in 3.2.5 from 4.0.0 using JNDI, I get the following error:

Caused by: java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
 java.io.InvalidClassException: org.jnp.interfaces.MarshalledValuePair; local class incompatible: stream classdesc serialVersionUID = -340384351571113913

Since the error seems to originate from incompatibilities in JNDI, I am assuming that any sort of remote lookup is not viable.

Is there any way to do this short of a custom solution ?

Thanks.

//Nicholas