Grails and unit#junit;4.8.1: configuration not found in junit#junit;4.8.1:

After upgrading to grails 1.3.x I started getting the following error...

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  ::          UNRESOLVED DEPENDENCIES         ::

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  :: junit#junit;4.8.1: configuration not found in junit#junit;4.8.1: 'master'. It was required from org.grails.internal#Books;0.1 test

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A found a few posts suggesting I needed to clear my ivy cache, but that did sfa. Turned out to be something in the jawr 3.3.2 plugin. It went away when I excluded junit from compile scope in the plugins dependencies.groovy

    dependencies {
        // specify dependencies here under either 'build', 'compile', 'runtime', 'test' or 'provided' scopes eg.
     compile ('net.jawr:jawr:3.3.2') {
      excludes "mail", "activation", "ejb","jms","jmxri","jmxremote", "junit"
 }