java.lang.LinkageError: loader constraint violation

[prurph]

What happened?

I'm noticing the following errors occurring repeatedly that appear to be coming from RyeCharm. I'm using PyCharm 2025.1 on macOS with ruff installed globally. The errors coincide with broken syntax highlighting and create error artifacts that appear to be resulting from partial scanning of the file (e.g. red squiggles in places where there isn't invalid syntax or other errors). Generally reopening the file or restarting PyCharm temporarily fixes it, then they crop up again as files are edited and the plugin runs. It is frequent enough that it makes things unusable.

Steps to reproduce

• Install RyeCharm with default settings on PyCharm 2025.1
• Load a Python project
• Error usually occurs when the project opens, as well as repeats when editing and/or explicitly invoking ruff (e.g. through Actions > Format File)

Relevant log output or stack trace

java.lang.LinkageError: loader constraint violation: loader com.intellij.ide.plugins.cl.PluginClassLoader @51013e01 wants to load class org.eclipse.lsp4j.Diagnostic. A different class with the same name was previously loaded by com.intellij.util.lang.PathClassLoader @13221655. (org.eclipse.lsp4j.Diagnostic is in unnamed module of loader com.intellij.util.lang.PathClassLoader @13221655)
	at insyncwithfoo.ryecharm.ruff.LSPKt.isForSyntaxError(LSP.kt:17)
	at insyncwithfoo.ryecharm.ruff.lsp.DiagnosticsSupport.getHighlightSeverity(DiagnosticsSupport.kt:35)
	at insyncwithfoo.ryecharm.ruff.lsp.DiagnosticsSupport.createAnnotation(DiagnosticsSupport.kt:46)
	at com.intellij.platform.lsp.impl.highlighting.LspAnnotator.m(LspAnnotator.kt:104)
	at com.intellij.platform.lsp.impl.highlighting.LspAnnotator.m(LspAnnotator.kt:158)
	at com.intellij.platform.lsp.impl.highlighting.LspAnnotator.m(LspAnnotator.kt:180)
	at com.intellij.platform.lsp.impl.highlighting.LspAnnotator.m(LspAnnotator.kt:158)
	at com.intellij.platform.lsp.impl.highlighting.LspAnnotator.m(LspAnnotator.kt:102)
	at com.intellij.platform.lsp.impl.highlighting.LspAnnotator.annotate(LspAnnotator.kt:70)
	at com.intellij.codeInsight.daemon.impl.AnnotationHolderImpl.runAnnotatorWithContext(AnnotationHolderImpl.java:213)
	at com.intellij.codeInsight.daemon.impl.AnnotatorRunner.lambda$runAnnotator$2(AnnotatorRunner.java:132)
	at com.intellij.codeInsight.daemon.impl.AnnotationSessionImpl.computeWithSession(AnnotationSessionImpl.java:87)
	at com.intellij.codeInsight.daemon.impl.AnnotatorRunner.runAnnotator(AnnotatorRunner.java:122)
	at com.intellij.codeInsight.daemon.impl.AnnotatorRunner.lambda$runAnnotatorsAsync$0(AnnotatorRunner.java:70)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
	at com.intellij.codeInsight.daemon.impl.AnnotatorRunner.lambda$runAnnotatorsAsync$1(AnnotatorRunner.java:70)
	at com.intellij.concurrency.ApplierCompleter.processArrayItem(ApplierCompleter.java:121)
	at com.intellij.concurrency.ApplierCompleter.processArray(ApplierCompleter.java:205)
	at com.intellij.concurrency.ApplierCompleter.execAll(ApplierCompleter.java:171)
	at com.intellij.concurrency.JobLauncherImpl.lambda$invokeConcurrentlyUnderProgressAsync$3(JobLauncherImpl.java:109)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
	at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
	at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
	at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
	at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
	at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
	at com.intellij.concurrency.JobLauncherImpl.lambda$invokeConcurrentlyUnderProgressAsync$4(JobLauncherImpl.java:109)
	at com.intellij.concurrency.JobLauncherImpl.safeIterate(JobLauncherImpl.java:177)
	at com.intellij.concurrency.JobLauncherImpl.invokeConcurrentlyUnderProgressAsync(JobLauncherImpl.java:106)
	at com.intellij.concurrency.JobLauncherImpl.processConcurrentlyAsync(JobLauncherImpl.java:468)
	at com.intellij.codeInsight.daemon.impl.AnnotatorRunner.runAnnotatorsAsync(AnnotatorRunner.java:71)
	at com.intellij.codeInsight.daemon.impl.GeneralHighlightingPass.collectHighlights(GeneralHighlightingPass.java:258)
	at com.intellij.codeInsight.daemon.impl.GeneralHighlightingPass.lambda$collectInformationWithProgress$12(GeneralHighlightingPass.java:191)
	at com.intellij.codeInsight.daemon.impl.HighlightInfoUpdaterImpl.lambda$runWithInvalidPsiRecycler$42(HighlightInfoUpdaterImpl.java:869)
	at com.intellij.codeInsight.daemon.impl.ManagedHighlighterRecycler.runWithRecycler(ManagedHighlighterRecycler.java:87)
	at com.intellij.codeInsight.daemon.impl.HighlightInfoUpdaterImpl.runWithInvalidPsiRecycler(HighlightInfoUpdaterImpl.java:850)
	at com.intellij.codeInsight.daemon.impl.GeneralHighlightingPass.lambda$collectInformationWithProgress$13(GeneralHighlightingPass.java:216)
	at com.intellij.codeInsight.daemon.impl.HighlightVisitorRunner.createHighlightVisitorsFor(HighlightVisitorRunner.java:82)
	at com.intellij.codeInsight.daemon.impl.GeneralHighlightingPass.collectInformationWithProgress(GeneralHighlightingPass.java:113)
	at com.intellij.codeInsight.daemon.impl.ProgressableTextEditorHighlightingPass.doCollectInformation(ProgressableTextEditorHighlightingPass.java:88)
	at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:70)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$2(PassExecutorService.java:435)
	at com.intellij.platform.diagnostic.telemetry.helpers.TraceKt.use(trace.kt:28)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$3(PassExecutorService.java:431)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
	at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$4(PassExecutorService.java:421)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.doRun(PassExecutorService.java:420)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$0(PassExecutorService.java:395)
	at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.cacheFileTypesInside(FileTypeManagerImpl.java:834)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$1(PassExecutorService.java:395)
	at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:393)
	at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:267)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:507)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1491)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:2073)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2035)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.execAll(ApplierCompleter.java:178)
		... 55 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.JobLauncherImpl.safeIterate(JobLauncherImpl.java:203)
		... 38 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.helpAll(ApplierCompleter.java:190)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:111)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.helpAll(ApplierCompleter.java:190)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:111)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.helpAll(ApplierCompleter.java:190)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:111)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.helpAll(ApplierCompleter.java:190)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:111)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.execAll(ApplierCompleter.java:178)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:110)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.execAll(ApplierCompleter.java:178)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:110)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.execAll(ApplierCompleter.java:178)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:110)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.execAll(ApplierCompleter.java:178)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:110)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more
	Suppressed: com.intellij.util.ExceptionUtilRt$RethrownStack: Rethrown at
		at com.intellij.util.ExceptionUtilRt.addRethrownStackAsSuppressed(ExceptionUtilRt.java:41)
		at com.intellij.util.ExceptionUtilRt.rethrowUnchecked(ExceptionUtilRt.java:16)
		at com.intellij.util.ExceptionUtil.rethrowUnchecked(ExceptionUtil.java:131)
		at com.intellij.util.ExceptionUtil.rethrow(ExceptionUtil.java:146)
		at com.intellij.concurrency.ApplierCompleter.execAll(ApplierCompleter.java:178)
		at com.intellij.concurrency.ApplierCompleter.lambda$exec$0(ApplierCompleter.java:110)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction$lambda$11(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
		at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.tryRunReadAction(AnyThreadWriteThreadingSupport.kt:522)
		at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1064)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapInReadActionAndIndicator$2(ApplierCompleter.java:153)
		at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:680)
		at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
		at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
		at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:679)
		at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:77)
		at com.intellij.concurrency.ApplierCompleter.wrapInReadActionAndIndicator(ApplierCompleter.java:164)
		at com.intellij.concurrency.ApplierCompleter.lambda$wrapAndRun$1(ApplierCompleter.java:145)
		at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:197)
		at com.intellij.concurrency.ApplierCompleter.wrapAndRun(ApplierCompleter.java:145)
		at com.intellij.concurrency.ApplierCompleter.exec(ApplierCompleter.java:113)
		... 5 more

Operating system

macOS

[prurph]

I discovered I had the LSP4J plugin installed as well (but I'm using ruff as "Native LSP client" in RyeCharm settings). Disabling it seems to have fixed this issue. I'll update if it reoccurs.

[InSyncWithFoo]

This is a known problem; see the warning at the end of this page. Also, RyeCharm uses Command line as the default running mode; this mode won't cause said error and is thus the recommended mode.

I assume you have been using PyCharm Community, which doesn't support LSP natively, with LSP4IJ? JetBrains added LSP support for PyCharm in 2025.1 as part of the "unification", and these two clients clash with each other.

[prurph]

Thank you! No I've been using pro I was updating from an older version and didn't realize I was running LSP4J. I'll check out command mode. Appreciate the plugin!