Java: Unable to create new native thread

Question

I have a Java application that is hosted on by a web hosting company. Every few days my app goes down with:

[2011-03-09 15:52:14,501] ERROR http-12021-9 
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Answer 1

Looks like thread leaking. Threads are created but then stuck somewhere. Dump the threads periodically to see if the number of allocated threads is growing. Look for any sleeping/hanging threads in the dump.

kill -QUIT jvm_pid