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https://issues.apache.org/jira/browse/VELOCITY-811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Osipov closed VELOCITY-811.
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Resolution: Duplicate
> Concurrency problems with rendering macros
> ------------------------------------------
>
> Key: VELOCITY-811
> URL: https://issues.apache.org/jira/browse/VELOCITY-811
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.7.x
> Environment: Oracle JVM 1.6.0_26-b03 on Ubuntu 11.04
> Reporter: Alex
>
> When using a single instance of Velocity engine from multiple threads
> sometimes the macro invocation is rendered as literal (#macroName...) as
> opposed to rendering the macro itself.
> I looked at source code and there is at least one problem with the
> implementation of VelocimacroManager.addNamespace. The code there is
> "strange" from the multi-threading point of view and puts an empty namespace
> into the ConcurrentHashMap before restoring it back. It should probably use
> "putIfAbsent" method instead.
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