Some time to time after editing a PUML file, even if the file is not open in any tab, I get this error from IntelliJ :
java.lang.NullPointerException
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
at java.base/java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:564)
at java.base/java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:591)
at java.base/java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:672)
at com.intellij.concurrency.JobLauncherImpl.processQueue(JobLauncherImpl.java:357)
at com.intellij.codeInsight.daemon.impl.InspectionRunner.processInOrder(InspectionRunner.java:293)
at com.intellij.codeInsight.daemon.impl.InspectionRunner.visitElements(InspectionRunner.java:268)
at com.intellij.codeInsight.daemon.impl.InspectionRunner.lambda$inspect$5(InspectionRunner.java:121)
at com.intellij.codeInspection.InspectionEngine.withSession(InspectionEngine.java:226)
at com.intellij.codeInsight.daemon.impl.InspectionRunner.inspect(InspectionRunner.java:109)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.collectInformationWithProgress(LocalInspectionsPass.java:131)
at com.intellij.codeInsight.daemon.impl.ProgressableTextEditorHighlightingPass.doCollectInformation(ProgressableTextEditorHighlightingPass.java:97)
at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:57)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$1(PassExecutorService.java:400)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1154)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$2(PassExecutorService.java:393)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:608)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:683)
at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:639)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:607)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.doRun(PassExecutorService.java:392)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$0(PassExecutorService.java:368)
at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:174)
at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:215)
at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:366)
at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:184)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)
Caused by: java.lang.NullPointerException: Cannot invoke "com.intellij.openapi.vfs.VirtualFile.findFileByRelativePath(String)" because the return value of "com.intellij.openapi.vfs.VirtualFile.getParent()" is null
at org.plantuml.idea.grammar.navigation.PumlIncludeReference.resolve(PumlIncludeReference.java:53)
at com.intellij.psi.PsiReferenceBase.isReferenceTo(PsiReferenceBase.java:118)
at com.intellij.psi.search.SingleTargetRequestResultProcessor.processTextOccurrence(SingleTargetRequestResultProcessor.java:38)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$5.lambda$execute$0(PsiSearchHelperImpl.java:962)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processTreeUp(LowLevelSearchUtil.java:85)
at com.intellij.psi.impl.search.LowLevelSearchUtil.lambda$processElementsAtOffsets$0(LowLevelSearchUtil.java:176)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processOffsets(LowLevelSearchUtil.java:203)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processElementsAtOffsets(LowLevelSearchUtil.java:175)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processElementsContainingWordInElement(LowLevelSearchUtil.java:129)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processInjectedFile(LowLevelSearchUtil.java:51)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processTreeUp(LowLevelSearchUtil.java:80)
at com.intellij.psi.impl.search.LowLevelSearchUtil.lambda$processElementsAtOffsets$0(LowLevelSearchUtil.java:176)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processOffsets(LowLevelSearchUtil.java:203)
at com.intellij.psi.impl.search.LowLevelSearchUtil.processElementsAtOffsets(LowLevelSearchUtil.java:175)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$5.execute(PsiSearchHelperImpl.java:958)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$2.processInReadAction(PsiSearchHelperImpl.java:283)
at com.intellij.psi.impl.search.PsiSearchHelperImpl$2.processInReadAction(PsiSearchHelperImpl.java:274)
at com.intellij.openapi.application.ReadActionProcessor.lambda$process$0(ReadActionProcessor.java:11)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:941)
at com.intellij.openapi.application.ReadAction.compute(ReadAction.java:68)
at com.intellij.openapi.application.ReadActionProcessor.process(ReadActionProcessor.java:11)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processCandidates$18(PsiSearchHelperImpl.java:919)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processVirtualFile$11(PsiSearchHelperImpl.java:555)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1154)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.processVirtualFile(PsiSearchHelperImpl.java:534)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processPsiFileRoots$7(PsiSearchHelperImpl.java:405)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processFilesConcurrentlyDespiteWriteActions$9(PsiSearchHelperImpl.java:476)
at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:174)
at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:215)
at com.intellij.psi.impl.search.PsiSearchHelperImpl.lambda$processFilesConcurrentlyDespiteWriteActions$10(PsiSearchHelperImpl.java:475)
at com.intellij.concurrency.ApplierCompleter.execAndForkSubTasks(ApplierCompleter.java:136)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1154)
at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$1(ApplierCompleter.java:92)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:608)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:683)
at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:639)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:607)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:104)
at com.intellij.concurrency.ApplierCompleter.lambda$compute$0(ApplierCompleter.java:83)
at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:174)
at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:215)
at com.intellij.concurrency.ApplierCompleter.compute(ApplierCompleter.java:83)
at java.base/java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:754)
... 5 more
Some time to time after editing a PUML file, even if the file is not open in any tab, I get this error from IntelliJ :