Hi guys, Some maven poms declare their dependency <version> in the pom itself. For example in guvnor-webapp-core (mea culpa): <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-jaxrs</artifactId> <version>2.3.2.Final</version> </dependency> The problem is that if other modules use the same dependency, they duplicate the version. And in time, as the <version> in 1 module is upgraded, the other gets forgotten. Why is this a problem? Both modules unit test with their own version of the dependency, but in production, when both modules are combined, only 1 version of the dependency can exist on the classpath. Solution: don't declare dependency <version> in your poms, declare it in the droolsjbpm-parent pom.