I have a simple Session BEAN with 1 method which prints a message to the server's console. I start two clients, each looks up the home and creates a new session bean. They start calling the function in a tight loop. After some time (100 to 500) calls one of the client stops calling. A bit later I get an exception from BOTH clients: javax.transaction.TransactionRolledbackException: java.lang.NullPointerException at com.evermind.server.rmi.a2.invokeMethod(JAX, Compiled Code) at com.evermind.server.rmi.au.invoke(JAX, Compiled Code) at Proxy4.findByName(Unknown Source) at com.citysearch.ejb.Entity.EntityClient.main(EntityClient.java, Compiled Code) Sometimes I get a deadlock exception on the server, in other times nothing. I am running 0.9.4 version of Orion on Windows NT. Thanks. -AP_