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https://issues.apache.org/jira/browse/VELOCITY-776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905340#action_12905340
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Nathan Bubna commented on VELOCITY-776:
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No solution yet, but i can replicate it via Velocity.mergeTemplate, by turning
caching off on the resource loader (StringResourceLoader in this case). Of
course, that's effectively the same as using evaluate(...). Using a resource
loader and turning caching on fixes the problem.
> "velocimacro.permissions.allow.inline.local.scope" makes VelocityEngine not
> threadsafe
> --------------------------------------------------------------------------------------
>
> Key: VELOCITY-776
> URL: https://issues.apache.org/jira/browse/VELOCITY-776
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.6.4
> Environment: Sun java jdk1.6.0_21, Ubuntu 10.04
> Reporter: Simon Kitching
> Attachments: RenderVelocityTemplate.java,
> RenderVelocityTemplateTest.java
>
>
> The attached unit test shows that when
> "velocimacro.permissions.allow.inline.local.scope" is set to true, and
> multiple threads use the same VelocityEngine instance then macros sometimes
> don't get expanded and the #macroname call remains in the output text.
> Notes:
> * running test method "testMultipleEvals" (single threaded case) always
> succeeds
> * running test method "testMultiThreadMultipleEvals" always fails
> * commenting out the allow.inline.local.scope line makes the multithread test
> pass (but of course has other side-effects)
> Interestingly, for the multithread case it seems that 1 thread always
> succeeds and N-1 threads fail.
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