We have an email notification which uses a Jelly template. So far it worked ok, but recently we started getting these:
Jan 25, 2012 2:11:23 PM hudson.plugins.emailext.ExtendedEmailPublisher sendMail
WARNING: Could not send email.
java.lang.NullPointerException
at hudson.model.Slave.createLauncher(Slave.java:311)
at hudson.plugins.perforce.PerforceMailResolver.findMailAddressFor(PerforceMailResolver.java:60)
at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:100)
at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:488)
at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:331)
at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:251)
at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:243)
at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:203)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:694)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:669)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:647)
at hudson.model.Build$RunnerImpl.cleanUp(Build.java:171)
at hudson.model.Run.run(Run.java:1448)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:230)