Setting Java heap space under Maven 2 on Windows

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The environment variable to set is MAVEN_OPTS, for example MAVEN_OPTS=-Xmx1024m. The maxmem configuration in the pom only applies when you set the compiler plugin to fork javac into a new JVM. Otherwise the plugin runs inside the same VM as Maven and thus within the memory passed on the command line via the MAVEN_OPTS.

To set MAVEN_OPTS under Windows 7:

  1. Right click on My Computer and select Properties (keyboard shortcut press Windows + Pause/Break)
  2. Click the Advanced System Settings link located in the left navigation of System Properties to display the Advanced System Properties
  3. Go to the Advanced tab and click the Environment Variables button located at the bottom of the Advanced System Properties configuration window
  4. Create a New user variable, set the Variable name to MAVEN_OPTS and set the Variable value to -Xmx1024m (or more)

Open a new command window and run mvn.

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