Intermittent Analysis failure after adding pitest plugin

[snakhawa]

sonarqube version : LTS Version 6.7.6 (build 38781) Community Edition
pitest plugin: 0.9.1

We are seeing errors where analysis is failing due to the following error after installing the plugin

Failed to execute task AWekg9mkm9yLZn4XDN_2
java.lang.IllegalArgumentException: Plugin [pitest] does not exist
at org.sonar.ce.container.CePluginRepository.getPluginInfo(CePluginRepository.java:95)
at org.sonar.server.computation.task.projectanalysis.step.LoadReportAnalysisMetadataHolderStep.getBasePluginKey(LoadReportAnalysisMetadataHolderStep.java:132)
at org.sonar.server.computation.task.projectanalysis.step.LoadReportAnalysisMetadataHolderStep.lambda$loadQualityProfiles$1(LoadReportAnalysisMetadataHolderStep.java:127)
at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1321)
at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at org.sonar.server.computation.task.projectanalysis.step.LoadReportAnalysisMetadataHolderStep.loadQualityProfiles(LoadReportAnalysisMetadataHolderStep.java:125)
at org.sonar.server.computation.task.projectanalysis.step.LoadReportAnalysisMetadataHolderStep.execute(LoadReportAnalysisMetadataHolderStep.java:88)
at org.sonar.server.computation.task.step.ComputationStepExecutor.executeSteps(ComputationStepExecutor.java:64)
at org.sonar.server.computation.task.step.ComputationStepExecutor.execute(ComputationStepExecutor.java:52)
at org.sonar.server.computation.task.projectanalysis.taskprocessor.ReportTaskProcessor.process(ReportTaskProcessor.java:73)
at org.sonar.ce.taskprocessor.CeWorkerImpl.executeTask(CeWorkerImpl.java:134)
at org.sonar.ce.taskprocessor.CeWorkerImpl.findAndProcessTask(CeWorkerImpl.java:97)
at org.sonar.ce.taskprocessor.CeWorkerImpl.withCustomizedThreadName(CeWorkerImpl.java:81)
at org.sonar.ce.taskprocessor.CeWorkerImpl.call(CeWorkerImpl.java:73)
at org.sonar.ce.taskprocessor.CeWorkerImpl.call(CeWorkerImpl.java:43)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

The 'pitest' plugin does exist in sonar. Not sure what’s causing this, but its intermittent and is causing analysis failures.

We had to remove the plugin to fix this problem.