A NullPointerException occurs after a build completes if the check box to
publish the build results is checked and no configuration information is
entered in the build publisher plugin. (Stack trace, below.)

FATAL: null
java.lang.NullPointerException
at hudson.plugins.build_publisher.BuildPublisher.getServerName
(BuildPublisher.java:194)
at hudson.plugins.build_publisher.BuildPublisher.perform(BuildPublisher.java:55)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep
(AbstractBuild.java:309)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep
(AbstractBuild.java:297)
at hudson.model.Build$RunnerImpl.post2(Build.java:118)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:282)
at hudson.model.Run.run(Run.java:774)
at hudson.model.Build.run(Build.java:85)
at hudson.model.ResourceController.execute(ResourceController.java:70)
at hudson.model.Executor.run(Executor.java:82)