[jboss-jira] [JBoss JIRA] (DROOLS-144) LinkageError exception during multi-threaded execution

Tue May 21 06:07:06 EDT 2013

Davide Sottara created DROOLS-144:
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             Summary: LinkageError exception during multi-threaded execution
                 Key: DROOLS-144
                 URL: https://issues.jboss.org/browse/DROOLS-144
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 6.0.0.Beta2, 5.5.0.Final
         Environment: Linux Ubuntu 12.10, OpenJDK 1.7
            Reporter: Davide Sottara
            Assignee: Mark Proctor
            Priority: Blocker

The exception is thrown in org.drools.rule.JavaRuntimeDialectData, when the CompositeClassLoader tries to define the class implementing a rule consequence. The method fastFindClass, which does the lazy initialization, is not thread-safe. It is possible for two threads to call findLoadedClass(..), get null and thus start the definition process which eventually results in the exception.

The situation is indeed very rare

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