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https://issues.apache.org/jira/browse/VELOCITY-966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claude Brisson closed VELOCITY-966.
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Resolution: Fixed
Since Velocity does support template caching, it does obviously support
rendering several times the same AST.
We would need more details or some example code.
I'm closing the issue for now, but feel free to reopen it if you provide new
materials.
> 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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