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

Did you do any memory tracking? Fire up jconsole and watch or log your memory consumption over a 24 hour period. If it (on average) goes up without coming back down, then you are running out of memory and possibly have insufficient memory to store the details of your new thread.