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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