[jira] (MPMD-175) Work around PMD bug #1155 which crashes the plugin with an empty ruleset element.

["Henning Schmiedehausen (JIRA)" <ji...@codehaus.org>]

Henning Schmiedehausen created MPMD-175:
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             Summary: Work around PMD bug #1155 which crashes the plugin with an empty ruleset element.
                 Key: MPMD-175
                 URL: https://jira.codehaus.org/browse/MPMD-175
             Project: Maven PMD Plugin
          Issue Type: Improvement
          Components: CPD, PMD
    Affects Versions: 3.0.1
            Reporter: Henning Schmiedehausen


This is a workaround for a bug in PMD up to and including 5.0.5 (I have an outstanding pull request to fix it for 5.0.6). 

The PMD plugin passes an empty ruleset list into the RulesetFactory in PMD which in turn crashes. The workaround is to use a dummy ruleset that does nothing when no other rules are present. 

Unfortunately it is not possible to just omit the ruleset element in some cases (because then the default list of rulesets is used). In my use case, I want the plugin to be present but no rules active. 

The pull request to fix this problem is here: https://github.com/apache/maven-plugins/pull/16

The patch is here: https://github.com/apache/maven-plugins/pull/16.patch

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