Concurrency problems with rendering macros
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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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