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See the attached process output and the exception. Raised when I was running Clean and Build on a NetBeans Platform Application maven project. The project was created back in 6.9.1. I was able to successfully open it in maven-dev build (maven-dev-213-on-100823), but Clean and Build failed.
Created attachment 101629 [details] output
Created attachment 101630 [details] exception
The build failure is http://jira.codehaus.org/browse/MNBMODULE-79 and is fixed in the upcoming release of the plugin. I'm not sure exactly what causes the NPE (as usual there is no Javadoc for Maven internals and various things are null at various times for no clear reason), but it is easy to fix at least: core-main #8eddfc836868
Integrated into 'main-golden', will be available in build *201008250001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/8eddfc836868 User: Jesse Glick <jglick@netbeans.org> Log: #189807: NPE when building.