Error "Could not initialize class org.kie.internal.utils.ServiceRegistryImpl" appear when managing sample business process

Solution Unverified - Updated -

Issue

I created sample jBPM project by JBDS 8 like the following.

  1. select [File]→[New]→[other]
  2. select [jBPM project] in [jBPM] and then click [Next]
  3. input project name
  4. select [a more advanced process including human tasks and persistence] and then click
  5. select [jBPM 6 or above] and then click [Finish]
  6. open sample.bpmn

When opening business process 'sample.bpm' in this project, the following 2 kind of error appear randomly.

  • Could not initialize class org.kie.internal.utils.ServiceRegistryImpl
  • SOLVER

This business process can be run by JUnit test even though above error happens.
This seems to happen more frequently on Windows environment and performing Project -> Clear sometimes trigger of these error.

How can I solve this error?

Environment

  • JBoss Developer Studio 8.1.0
  • JBoss Developer Studio Integration Stack 8.0.7
    • "JBoss Drools Core" plugin 6.2/6.3
  • Windows 7 Professional SP1
  • JBoss BRMS 6.3.0

Note: It's also reported with JBDS 9.1 / Integration Stack 9. The root factor is "JBoss Drools Core" plugin version.

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