Hi, I am using JBoss AS jboss-4.0.2. I am getting OutOfMemoryError when I send the messages to an MDB. It happens after i send 30-40 messages. What I have observed on the web-console of Jboss is that #Threads increases by some 30 whenever I sent one message to a queue. Even though message is getting consumed instantly, the thread count doesn?t come down but keep on increasing by a factor of approx 30 or more with each message. After sometime it reaches some 2000 figure and server starts giving out of memory error. If I make process synchronous (I mean not use MDB) , thread count doesnt increase. It implies that each message is adding approx. 30 threads and threads are not released after messages are getting consumed. Can anybody explain it and give a fix ? Please find the stack of errors below. I get either of these two stacks. Any help will be appreciated. Thank you Suhail 20 Dec 2006 16:20:10,176 WARN (UILServerILService Accept Thread:) [org.jboss.mq.il.uil2.UILServerILService] Unexpected error in setup of client connection java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.java:574) at org.jboss.mq.il.uil2.SocketManager.start(SocketManager.java:147) at org.jboss.mq.il.uil2.UILServerILService.run(UILServerILService.java:162) at java.lang.Thread.run(Thread.java:595) 20 Dec 2006 13:18:35,031 ERROR (TimeoutFactory-0:) [org.jboss.logging.Log4jService$ThrowableListenerLoggingAdapter] Unhandled Throwable org.jboss.util.threadpool.ThreadPoolFullException: java.lang.OutOfMemoryError: unable to create new native thread at org.jboss.util.threadpool.BasicThreadPool.execute(BasicThreadPool.java:417) at org.jboss.util.threadpool.BasicThreadPool.runTaskWrapper(BasicThreadPool.java:192) at org.jboss.util.threadpool.BasicThreadPool.run(BasicThreadPool.java:212) at org.jboss.util.threadpool.BasicThreadPool.run(BasicThreadPool.java:206) at org.jboss.util.timeout.TimeoutFactory.doWork(TimeoutFactory.java:223) at org.jboss.util.timeout.TimeoutFactory.access$000(TimeoutFactory.java:41) at org.jboss.util.timeout.TimeoutFactory$1.run(TimeoutFactory.java:136) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3995779#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...