The env is:
RH9, IBM JVM 1.4.1 on the JMS client machine. Sun JVM 1.4.2 on the jboss server
Enable trace logging on the client.
export LD_ASSUME_KERNEL=2.4.1 on your RH9 machine.
What does the following line mean? Native pthread support? I think it is already enabled even i didn't set this env variable because pstree command shows only one process instead of a lot of processes as in RH7.3.