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

When you fire up your process, the JVM has a limited heap size (default is 128MB). That server may well have more memory, but your JVM doesn't - you used it all.

You can change this with the -Xms and -Xmx command line arguments, but I would suggest finding the memory leak first :)