Wednesday, November 17, 2010

Java -=-Increase heap size

If Java runs out of memory, the following error occurs:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
This can have two reasons:
  • Your Java application has a memory leak. There are tools like YourKit Java Profiler that help you to identify such leaks.
  • Your Java application really needs a lot of memory (more than 128 MB by default!). In this case the Java heap size can be increased using the following runtime parameters:
java -Xms -Xmx
Defaults are:
java -Xms32m -Xmx128m
You can set this either in the Java Control Panel or on the command line, depending on the environment you run your application.

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