EmptyStackException when rendering macros simultaneously
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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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