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

[Dmitri Farafonov (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798306#comment-12798306 ] 

Dmitri Farafonov commented on DROOLS-144:
-----------------------------------------

Submitted pull request that solve this issue: https://github.com/droolsjbpm/droolsjbpm-knowledge/pull/47
                
> 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: 5.5.0.Final, 6.0.0.Beta2
>         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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