TaskModelProvider's ServiceLoader sync problem ---------------------------------------------- Key: DROOLS-457 URL: https://issues.jboss.org/browse/DROOLS-457 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 6.0.0.Final, 6.0.1.Final, 6.1.0.Beta1, 6.1.0.Beta2, 6.1.0.Final Reporter: Mariano De Maio Assignee: Mark Proctor Fix For: 6.1.0.Beta2 Attachments: test-case.zip This bug was found related to jBPM6 components, but its solution needs to be implemented in the kie-internal project, hence we report it in this project. When the TaskModelProvider access the factory object, it iterates the service loader directly. Unfortunately, the ServiceLoader class states: "Instances of this class are not safe for use by multiple concurrent threads." (http://docs.oracle.com/javase/6/docs/api/java/util/ServiceLoader.html) This causes that environments that need to use the TaskModelProvider from different threads with no prior invocation. I'll add a maven test to reproduce the issue. We have also a solution we'll submit in a pull request