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Asked: 2026-05-11T00:38:20+00:00

When trying to launch and run a flex/java project in eclipse I kept getting

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When trying to launch and run a flex/java project in eclipse I kept getting a ‘Out of Memory Exception’ and ‘Java Heap Space’ using Eclipse, Tomcat and a JRE.

While researching trying to adjust the memory settings I found three places to adjust these:

  • Eclipse.ini

  • The JRE Settings under Window > Preferences

  • Catalina.sh or Catalina.bat

What are the differences between setting -xms and -xmx in these different places and what does is mean?

Is there any way to verify these memory settings are being set accordingly?

What are the optimal -xms and -xmx settings for a computer with 2gb of RAM?

Any other memory tips?

Thanks.

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1 Answer

  1. -xms is the start memory (at the VM start), -xmx is the maximum memory for the VM

    • eclipse.ini : the memory for the VM running eclipse
    • jre setting : the memory for java programs run from eclipse
    • catalina.sh : the memory for your tomcat server
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