[jboss-jira] [JBoss JIRA] (DROOLS-457) TaskModelProvider's ServiceLoader sync problem

[Mariano De Maio (JIRA)]

Mariano De Maio created DROOLS-457:
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             Summary: 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: 6.1.0.Beta1, 6.0.1.Final, 6.0.0.Final, 6.1.0.Beta2, 6.1.0.Final
            Reporter: Mariano De Maio
            Assignee: Mark Proctor


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

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