I want to take load test for the application, using JMeter. The application use Message Driven Bean. First, I try with 10 thread, the http response is OK. But when I increase with 100 thread, some of the http response is error, with http response code 500, message : Internal Server Error. And in JBoss log, message : javax.jms.IllegalStateException - Message producer is closed Why it is happened, and how to solve this problem ? Thank you.