[PMD] Collecting PMD analysis files... 
  ERROR: Publisher hudson.plugins.pmd.PmdPublisher aborted due to exception java.lang.NullPointerException: Name is null 
    at java.lang.Enum.valueOf(Enum.java:195) 
    at hudson.plugins.analysis.util.model.Priority.valueOf(Priority.java:18) 
    at hudson.plugins.analysis.core.HealthAwarePublisher.getMinimumPriority(HealthAwarePublisher.java:488) 
    at hudson.plugins.analysis.core.AbstractHealthDescriptor.<init>(AbstractHealthDescriptor.java:42) 
    at hudson.plugins.pmd.PmdHealthDescriptor.<init>(PmdHealthDescriptor.java:25) 
    at hudson.plugins.pmd.PmdResultAction.<init>(PmdResultAction.java:31) 
    at hudson.plugins.pmd.PmdPublisher.perform(PmdPublisher.java:105) 
    at hudson.plugins.analysis.core.HealthAwarePublisher.perform(HealthAwarePublisher.java:208) 
    at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:27) 
    at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:601) 
    at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:580) 
    at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:558) 
    at hudson.model.Build$RunnerImpl.post2(Build.java:158) 
    at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:528) 
    at hudson.model.Run.run(Run.java:1280) 
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) 
    at hudson.model.ResourceController.execute(ResourceController.java:88) 
    at hudson.model.Executor.run(Executor.java:127)