Ryan Gardner created MVERSIONS-173:
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             Summary: compare-dependencies mojo fails with NPE
                 Key: MVERSIONS-173
                 URL: https://jira.codehaus.org/browse/MVERSIONS-173
             Project: Maven 2.x Versions Plugin
          Issue Type: Bug
    Affects Versions: 1.3
            Reporter: Ryan Gardner


When I try to run the compare-dependencies mojo against an older version of the 
same project I am getting the following exception on a couple of different 
projects (I haven't actually had a run of compare-dependencies work for me yet)

{noformat}
 Caused by: java.lang.NullPointerException
        at 
org.codehaus.mojo.versions.CompareDependenciesMojo.update(CompareDependenciesMojo.java:176)
        at 
org.codehaus.mojo.versions.AbstractVersionsUpdaterMojo.process(AbstractVersionsUpdaterMojo.java:322)
        at 
org.codehaus.mojo.versions.AbstractVersionsUpdaterMojo.execute(AbstractVersionsUpdaterMojo.java:257)
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
{noformat}

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