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https://issues.apache.org/jira/browse/VELOCITY-966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17878147#comment-17878147
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Dmitry Ponomarev commented on VELOCITY-966:
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Please see code example:
[https://github.com/techsup69/velocity-966]
It demonstrates multiple usage of parsed template with velocity 1.7 and 2.3.
In velocity 1.7 it works, in 2.3 it fails with NullPointerException.
> RuntimeInstance.render throws null pointer exception when trying to render
> the same AST
> ----------------------------------------------------------------------------------------
>
> Key: VELOCITY-966
> URL: https://issues.apache.org/jira/browse/VELOCITY-966
> Project: Velocity
> Issue Type: Bug
> Affects Versions: 2.3
> Reporter: Alex
> Priority: Major
>
> The objective is to use
> *RuntimeInstance.parse* to get the parsed AST for some template and cache the
> AST.
> Then use *RuntimeInstance.render* multiple times to render the text.
>
> It appears that in version 2.3 {*}RuntimeInstance.{*}{*}render{*} invokes the
> Node.init call and at the end of the rendering clears the parser and tokens.
> On the next attempt to render init fails with the NullPointerException
> because tokens have been cleared.{*}{*}
>
> So you can not call *RuntimeInstance.render* on the same AST several times
> which seems to be the intent of this method...
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