How can I specify the default JVM arguments for programs I run from eclipse?

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Go to Window → Preferences → Java → Installed JREs. Select the JRE you’re using, click Edit, and there will be a line for Default VM Arguments which will apply to every execution. For instance, I use this on OS X to hide the icon from the dock, increase max memory and turn on assertions:

-Xmx512m -ea -Djava.awt.headless=true

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