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http://jira.codehaus.org/browse/MOJO-905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_108091
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David Holroyd commented on MOJO-905:
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I've applied a slightly modified version of your patch (the build should not
fail if the POM lacks a specification of <libDirectory>, so I add a test for
this case).
I'll keep this issue open for the moment, as the docs need updating too.
> [antlr3] .tokens files for tokenVocab can't be found in package subfolders
> --------------------------------------------------------------------------
>
> Key: MOJO-905
> URL: http://jira.codehaus.org/browse/MOJO-905
> Project: Mojo
> Issue Type: Bug
> Reporter: David Holroyd
> Attachments: MOJO-905.patch
>
>
> Due to the plugin arranging the output files into a folder structure that
> matches the package structure of the source folder, ANTLR end's up not being
> able to find the .tokens file specified by a tokenVocab option (unless the
> 'imported' grammar, and therefore the generated java classes, are in the
> default top-level package).
> This issue has been reported on antlr-interest (as ideally ANTLR would
> support this use case directly),
> http://www.antlr.org:8080/pipermail/antlr-interest/2007-August/023196.html
> It isn't clear if this is something that the antlr3-maven-plugin can work
> around, since ANTLR only allows the specification of a single folder to
> search for .tokens files. In a multi-grammar build with grammars a.A, b.B
> and c.C, the plugin could not know which of 'a' or 'b' to specify as the lib
> folder when processing grammar C. We could inspect the dependencies of
> grammar C, and on seeing a dependence on 'B.tokens' infer that the lib option
> should be set to 'b', but this will still be defeated in the pathological
> case of multiple grammars with the same name but in different 'packages'.
> I think the cause for all this confusion is that 'packages' are a
> Java-output-specific concept that ANTLR itself doesn't have direct support
> for (as it is intended to be able to generate code in arbitrary languages).
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