Some of our build jobs are sporadically getting the following error at the end of the build:

[WARNINGS] Parsing warnings in console log with parser Maven
ERROR: Publisher hudson.plugins.warnings.WarningsPublisher aborted due to exception
java.lang.NullPointerException
at hudson.plugins.analysis.util.model.AbstractAnnotation.equals(AbstractAnnotation.java:499)
at com.google.common.collect.RegularImmutableSet.contains(RegularImmutableSet.java:54)
at java.util.AbstractSet.removeAll(AbstractSet.java:157)
at hudson.plugins.analysis.core.AnnotationDifferencer.difference(AnnotationDifferencer.java:43)
at hudson.plugins.analysis.core.AnnotationDifferencer.getNewAnnotations(AnnotationDifferencer.java:27)
at hudson.plugins.analysis.core.BuildResult.initialize(BuildResult.java:261)
at hudson.plugins.analysis.core.BuildResult.<init>(BuildResult.java:215)
at hudson.plugins.warnings.WarningsResult.<init>(WarningsResult.java:52)
at hudson.plugins.warnings.WarningsResult.<init>(WarningsResult.java:46)
at hudson.plugins.warnings.WarningsPublisher.annotate(WarningsPublisher.java:406)
at hudson.plugins.warnings.WarningsPublisher.parseConsoleLog(WarningsPublisher.java:365)
at hudson.plugins.warnings.WarningsPublisher.perform(WarningsPublisher.java:276)
at hudson.plugins.analysis.core.HealthAwareRecorder.perform(HealthAwareRecorder.java:289)
at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:27)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:710)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:685)
at hudson.model.Build$RunnerImpl.post2(Build.java:162)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:632)
at hudson.model.Run.run(Run.java:1463)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:239)

This only happens on some jobs, and only for some builds. Sometimes we can fix the the error by disabling and enabling the warnings plugin for that build, but sometimes the error will return after a couple of builds. So we don't really have a bulletproof workaround for this issue.

We have tried using warnings 4.17, but then we got a similar error, but without the whole stacktrace, so we reverted to 4.16:

[WARNINGS] Parsing warnings in console log with parser Maven
ERROR: Publisher hudson.plugins.warnings.WarningsPublisher aborted due to exception
java.lang.NullPointerException