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Changing the memory used by JOnAS

If JOnAS throws a out of memory exception (e.g. Heap Space) change its configuration.

Valid for Windows NT/XP/Vista/Server, Sun JVM >1.5

In bin/nt/config_env.bat add a new line "JAVA_OPTS" like this:


Set JAVA_OPTS=-server -Xms512m -Xmx1024m -Xss256k 


  • -server enables server behaviour of the JVM
  • -Xms512m -Xmx1024m changes lower and upper limit for heap space
  • -Xss256k influences the stack size