Just a heads up, in case you are using the community release 5.4.0.Final in a multi-threaded application, be aware that we found a quite serious racing condition bug:

  The bug is now fixed in 5.4.x branch, so I strongly recommend that you build from source and use that instead. The bug was also fixed in the up-stream branch and will be released in 5.5.0.

  IMPORTANT: if you are a Red Hat subscriber, you don't need to do anything as the problem did not exist in the product release.

  Edson
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  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com