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https://issues.apache.org/jira/browse/VELOCITY-556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506756
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Will Glass-Husain commented on VELOCITY-556:
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Thanks for catching this. Seems similar to VELOCITY-536 too.
I'll try to do a visual inspection of the various nodes and see if this occurs
elsewhere.
> Another concurrency issue with macros
> -------------------------------------
>
> Key: VELOCITY-556
> URL: https://issues.apache.org/jira/browse/VELOCITY-556
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.5
> Reporter: Dima Tkach
> Fix For: 1.6
>
>
> The symptom is similar to
> https://issues.apache.org/jira/browse/VELOCITY-514 and
> https://issues.apache.org/jira/browse/VELOCITY-24
> - the 'Null AST' errors show up in the logs under concurrency.
> The issue is different however. First, unlike those two, this one only
> happens when the macro caching is ON (at least, I was never able to reproduce
> it with the cache off), and second, the issue only appears when there is a
> macro call from inside a macro. Like this:
> #macro A() A #end
> #macro AB() #A()B#end
> I have debugged this problem, and came up with this fix. I replaced
> Velocimacro.class file in velocity-1.5.jar with the one I compiled with my
> fix, and have been running it in production evironment for a while. It does
> indeed seem to have fixed the problem.
> Please feel free to use this fix if you like it.
> --- org/apache/velocity/runtime/directive/VelocimacroProxy.orig 2007-06-08
> 19:21:19.000000000 -0400
> +++ org/apache/velocity/runtime/directive/VelocimacroProxy.java 2007-06-08
> 19:22:10.000000000 -0400
> @@ -164,11 +164,14 @@
> if (nodeTree != null)
> {
> + synchronized (this)
> + {
> if ( !init )
> {
> nodeTree.init( context, rsvc);
> init = true;
> }
> + }
> /*
> * wrap the current context and add the VMProxyArg objects
> -- Dima
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