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As of Maven 3 beta 1, parallel builds are now supported added as an experimental feature in maven. The command is as follows:

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Plugin/Settings compatibility

The functionality within the Maven3 core is thread safe and well behaved, but the maven ecosystem consists of a large number of subsystems, and a lot of plugins have a large number of dependencies. Not all of these plugins/libraries were written with thread safety in mind.

The following plugins/settings are KNOWN to have incompatibilities when running any of the parallel modes:

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There is a bug in plexus io that causes all the jar/war/ear plugins to intermittently fail with output on the form "Failed to retrieve numeric file attributes using: '/bin/sh -c "ls -1nlaR <a path>" (Maybe nix linux issue only. Jira issue TBA, working on patch; might be related to http://jira.codehaus.org/browse/PLXCOMP-122^{Image Added} )