I've followed the steps on http://leanjavaengineering.wordpress.com/2010/08/25/grails-codenarc-hudson/ and I'm getting an ERROR: Publisher hudson.plugins.violations.ViolationsPublisher aborted due to exception
java.lang.NullPointerException.

Console Output

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Started by user anonymous
[workspace] $ grails clean
Welcome to Grails 1.3.5 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: /opt/install/grails

Base Directory: /home/tek/.hudson/jobs/myapp/workspace
Resolving dependencies...
Dependencies resolved in 4923ms.
Running script /opt/install/grails/scripts/Clean.groovy
Environment set to development
[delete] Deleting: /home/tek/.grails/1.3.5/projects/workspace/resources/web.xml
[delete] Deleting directory /home/tek/.hudson/jobs/myapp/workspace/target/classes
[delete] Deleting directory /home/tek/.grails/1.3.5/projects/workspace/plugin-classes
[delete] Deleting directory /home/tek/.grails/1.3.5/projects/workspace/resources
[delete] Deleting directory /home/tek/.hudson/jobs/myapp/workspace/target/test-classes
[workspace] $ grails test-app
Welcome to Grails 1.3.5 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: /opt/install/grails

Base Directory: /home/tek/.hudson/jobs/myapp/workspace
Resolving dependencies...
Dependencies resolved in 5055ms.
Running script /opt/install/grails/scripts/TestApp.groovy
Environment set to test
[mkdir] Created dir: /home/tek/.grails/1.3.5/projects/workspace/plugin-classes
[groovyc] Compiling 32 source files to /home/tek/.grails/1.3.5/projects/workspace/plugin-classes
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
[mkdir] Created dir: /home/tek/.hudson/jobs/myapp/workspace/target/classes
[groovyc] Compiling 8 source files to /home/tek/.hudson/jobs/myapp/workspace/target/classes
[copy] Copied 4 empty directories to 2 empty directories under /home/tek/.grails/1.3.5/projects/workspace/resources
[copy] Copied 7 empty directories to 6 empty directories under /home/tek/.grails/1.3.5/projects/workspace/resources
[copy] Copied 2 empty directories to 2 empty directories under /home/tek/.grails/1.3.5/projects/workspace/resources
[copy] Copied 2 empty directories to 2 empty directories under /home/tek/.grails/1.3.5/projects/workspace/resources
[mkdir] Created dir: /home/tek/.hudson/jobs/myapp/workspace/target/test-reports/html
[mkdir] Created dir: /home/tek/.hudson/jobs/myapp/workspace/target/test-reports/plain

Starting unit test phase ...
[mkdir] Created dir: /home/tek/.hudson/jobs/myapp/workspace/target/test-classes/unit

Starting integration test phase ...
[copy] Copying 1 file to /home/tek/.hudson/jobs/myapp/workspace/target/test-classes/integration
[copy] Copying 1 file to /home/tek/.hudson/jobs/myapp/workspace/target/test-classes
[mkdir] Created dir: /home/tek/.grails/1.3.5/projects/workspace/resources/grails-app/i18n
[native2ascii] Converting 13 files from /home/tek/.hudson/jobs/myapp/workspace/grails-app/i18n to /home/tek/.grails/1.3.5/projects/workspace/resources/grails-app/i18n
[mkdir] Created dir: /home/tek/.grails/1.3.5/projects/workspace/resources/plugins/code-coverage-1.1.8/grails-app/i18n
[native2ascii] Converting 1 file from /home/tek/.grails/1.3.5/projects/workspace/plugins/code-coverage-1.1.8/grails-app/i18n to /home/tek/.grails/1.3.5/projects/workspace/resources/plugins/code-coverage-1.1.8/grails-app/i18n
[mkdir] Created dir: /home/tek/.grails/1.3.5/projects/workspace/resources/plugins/codenarc-0.7/grails-app/i18n
[native2ascii] Converting 1 file from /home/tek/.grails/1.3.5/projects/workspace/plugins/codenarc-0.7/grails-app/i18n to /home/tek/.grails/1.3.5/projects/workspace/resources/plugins/codenarc-0.7/grails-app/i18n
[copy] Copying 1 file to /home/tek/.hudson/jobs/myapp/workspace/target/classes

Starting other test phase ...
[junitreport] Processing /home/tek/.hudson/jobs/myapp/workspace/target/test-reports/TESTS-TestSuites.xml to /tmp/null1784349293
[junitreport] Loading stylesheet /opt/install/grails/lib/junit-frames.xsl
[junitreport] Transform time: 5212ms
[junitreport] Deleting: /tmp/null1784349293

Tests PASSED - view reports in target/test-reports
Application context shutting down...
Application context shutdown.
[workspace] $ grails codenarc
Welcome to Grails 1.3.5 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: /opt/install/grails

Base Directory: /home/tek/.hudson/jobs/myapp/workspace
Resolving dependencies...
Dependencies resolved in 6465ms.
Running script /home/tek/.grails/1.3.5/projects/workspace/plugins/codenarc-0.7/scripts/Codenarc.groovy
Environment set to development
Running CodeNarc ...
CodeNarc completed: (p1=0; p2=1; p3=58) 8666ms
CodeNarc finished; report generated: target/test-reports/CodeNarcReport.xml
ERROR: Publisher hudson.plugins.violations.ViolationsPublisher aborted due to exception
java.lang.NullPointerException
at hudson.plugins.violations.generate.OutputFileModel.doViolation(OutputFileModel.java:198)
at hudson.plugins.violations.generate.OutputFileModel.createLimited(OutputFileModel.java:113)
at hudson.plugins.violations.generate.OutputFileModel.execute(OutputFileModel.java:80)
at hudson.plugins.violations.generate.ExecuteFilePath.execute(ExecuteFilePath.java:45)
at hudson.plugins.violations.generate.GenerateXML.execute(GenerateXML.java:47)
at hudson.plugins.violations.ViolationsCollector.invoke(ViolationsCollector.java:124)
at hudson.plugins.violations.ViolationsCollector.invoke(ViolationsCollector.java:27)
at hudson.FilePath.act(FilePath.java:753)
at hudson.FilePath.act(FilePath.java:735)
at hudson.plugins.violations.ViolationsPublisher.perform(ViolationsPublisher.java:74)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$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$RunnerImpl.post2(Build.java:157)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:528)
at hudson.model.Run.run(Run.java:1303)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:137)
Finished: FAILURE