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https://issues.apache.org/jira/browse/VELOCITY-566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Etienne Massip closed VELOCITY-566.
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> EmptyStackException when rendering macros simultaneously
> --------------------------------------------------------
>
> Key: VELOCITY-566
> URL: https://issues.apache.org/jira/browse/VELOCITY-566
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.6
> Reporter: Etienne Massip
> Fix For: 1.6
>
> Attachments: emptyStackExceptionMacrosVTL.patch
>
>
> When two threads are running VelocimacroFactory.startRenderingMacro()
> simultaneously (same template), both check that templateMap is empty, then
> both create a new stack, then the second thread put it in templateMap,
> replacing the one added by the first thread.
> At this time we got a stack which size == 1 instead of 2.
> Then both threads endProcessingMacros(), both get stack from templateMap and
> check that its size is > 0, first one empty stack then second pop() macro and
> gets an EmptyStackException.
> behavior was introduced by improvement VELOCITY-297.
> patch is joined, synchronize(templateMap) in
> VelocimacroFactory.startRenderingMacro().
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