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The fix for bug 1039016 isn't complete, as it misses <pluginRepositories>. This is slightly less severe than the original issue, although the symptoms are the same - if a project references a plugin that is not found in the existing repositories, the project will fail.
Fixed by https://github.com/droolsjbpm/drools/commit/5b1ff2a94
VERIFIED with 6.0.1.ER2