LSP4IJ 0.21.0 Release

[angelozerr]

We are about to release LSP4IJ 0.21.0. Highlights of this release include some memory leak issues, performance improvement.

More details in the changelog.

Please give a try to the latest nightly build.

Unless you report a blocking issue, we'll proceed with the release next Friday 08/27/2026. If you need to have more time, please tell me.

cc @CppCXY @InSyncWithFoo @seachicken @KUGDev @AlexWeinstein92 @aparnamichael @MituuZ @turkeylurkey @mrglavas @koxudaxi @FalsePattern @onriv @kristofvb @kdvolder @rcjsuen @jansorg @SCWells72 @ericdallo @nikunjarora12345 @sergeysavchuk @bzoracler @bratorange @ericbodden @jomof @cwarden @Haraprosad @WalterWoshid @charlieegan3 @nya3jp @gaborbernat @eliseevh @bodiam @mobiletoly @Arthurdw @tim-sh @yhk1038 @rz1989s @nikitusik @SergejSalnikov @helin24 @thakyZ @hamada-develop @jorgsowa @MilkdromedaStudios @Haraprosad @3Lord3 @aridclown @dessina-devasia

[dessina-devasia]

Hi @angelozerr, I've tested liberty-tools-intellij with LSP4IJ 0.21.0 latest nightly build (0.20.2-20260831-065524). No issues observed. Thank you!

[angelozerr]

Thanks @dessina-devasia!

[SergejSalnikov]

I'm getting:

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'file' of com/redhat/devtools/lsp4ij/server/definition/LanguageServerFileAssociation.match must not be null
	at com.redhat.devtools.lsp4ij.server.definition.LanguageServerFileAssociation.$$$reportNull$$$0(LanguageServerFileAssociation.java)
	at com.redhat.devtools.lsp4ij.server.definition.LanguageServerFileAssociation.match(LanguageServerFileAssociation.java)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.match(LanguageServiceAccessor.java:176)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.getMatchedLanguageServerDefinitions(LanguageServiceAccessor.java:582)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.getMatchedLanguageServersWrappers(LanguageServiceAccessor.java:449)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.getLanguageServers(LanguageServiceAccessor.java:367)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.getLanguageServers(LanguageServiceAccessor.java:358)
	at com.redhat.devtools.lsp4ij.ConnectDocumentToLanguageServerSetupParticipant.connectToLanguageServer(ConnectDocumentToLanguageServerSetupParticipant.java:53)
	at com.redhat.devtools.lsp4ij.ConnectDocumentToLanguageServerSetupParticipant.lambda$selectionChanged$0(ConnectDocumentToLanguageServerSetupParticipant.java:120)
	at com.intellij.util.RunnableCallable.call(RunnableCallable.java:20)

[angelozerr]

Have you this issue every time?

[angelozerr]

@SergejSalnikov please try nighty and tell me if it works better. I plan to do a new release soon.

[SergejSalnikov]

Have not tried nightly, but run into another exception:

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'future' of com/intellij/openapi/progress/util/ProgressIndicatorUtils.awaitWithCheckCanceled must not be null
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.$$$reportNull$$$0(ProgressIndicatorUtils.java)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.awaitWithCheckCanceled(ProgressIndicatorUtils.java)
	at com.redhat.devtools.lsp4ij.features.highlight.LSPHighlightUsagesHandlerFactory.getTargets(LSPHighlightUsagesHandlerFactory.java:81)
	at com.redhat.devtools.lsp4ij.features.highlight.LSPHighlightUsagesHandlerFactory.createHighlightUsagesHandler(LSPHighlightUsagesHandlerFactory.java:60)
	at com.intellij.codeInsight.highlighting.HighlightUsagesHandlerFactory.createHighlightUsagesHandler(HighlightUsagesHandlerFactory.java:30)
	at com.intellij.codeInsight.highlighting.HighlightUsagesHandler.createCustomHandler(HighlightUsagesHandler.java:125)
	at com.intellij.codeInsight.daemon.impl.IdentifierHighlightingComputer.computeRanges(IdentifierHighlightingComputer.kt:75)
	at com.intellij.codeInsight.daemon.impl.IdentifierHighlightingAccessorImpl.getMarkupData$lambda$0$0(IdentifierHighlightingAccessorImpl.kt:31)
	at com.intellij.openapi.progress.CoroutinesKt.jobToIndicator$lambda$0(coroutines.kt:588)
	at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:98)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$0(CoreProgressManager.java:308)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$0(CoreProgressManager.java:777)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:853)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:809)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:776)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:89)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:292)
	at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:98)
	at com.intellij.openapi.progress.CoroutinesKt.jobToIndicator(coroutines.kt:576)
	at com.intellij.openapi.progress.CoroutinesKt.contextToIndicator(coroutines.kt:558)
	at com.intellij.openapi.progress.CoroutinesKt.blockingContextToIndicator(coroutines.kt:534)
	at com.intellij.codeInsight.daemon.impl.IdentifierHighlightingAccessorImpl.getMarkupData$lambda$0(IdentifierHighlightingAccessorImpl.kt:30)
	at com.intellij.openapi.application.rw.InternalReadAction.insideReadAction(InternalReadAction.kt:123)
	at com.intellij.openapi.application.rw.InternalReadAction.tryReadCancellable$lambda$0(InternalReadAction.kt:113)
	at com.intellij.openapi.application.rw.CancellableReadActionKt.cancellableReadActionInternal$lambda$0$0$0(cancellableReadAction.kt:38)
	at com.intellij.openapi.application.RunnableToLambda.invoke(coroutines.kt:338)
	at com.intellij.openapi.application.RunnableToLambda.invoke(coroutines.kt:336)
	at com.intellij.platform.locking.impl.NestedLocksThreadingSupport.tryRunReadAction(NestedLocksThreadingSupport.kt:971)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1291)
	at com.intellij.openapi.application.rw.CancellableReadActionKt.cancellableReadActionInternal$lambda$0$0(cancellableReadAction.kt:36)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtilService.runActionAndCancelBeforeWrite(ProgressIndicatorUtilService.java:91)
	at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runActionAndCancelBeforeWrite(ProgressIndicatorUtils.java:165)
	at com.intellij.openapi.application.rw.CancellableReadActionKt.cancellableReadActionInternal$lambda$0(cancellableReadAction.kt:34)
	at com.intellij.concurrency.ThreadContext.installThreadContext(threadContext.kt:307)
	at com.intellij.concurrency.ThreadContext.installThreadContext$default(threadContext.kt:304)
	at com.intellij.openapi.application.rw.CancellableReadActionKt.cancellableReadActionInternal(cancellableReadAction.kt:30)
	at com.intellij.openapi.application.rw.InternalReadAction.tryReadCancellable(InternalReadAction.kt:112)
	at com.intellij.openapi.application.rw.InternalReadAction.tryReadAction(InternalReadAction.kt:98)
	at com.intellij.openapi.application.rw.InternalReadAction.readLoop(InternalReadAction.kt:85)
	at com.intellij.openapi.application.rw.InternalReadAction.access$readLoop(InternalReadAction.kt:23)
	at com.intellij.openapi.application.rw.InternalReadAction$readLoop$1.invokeSuspend(InternalReadAction.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:610)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runDefaultDispatcherTask(CoroutineScheduler.kt:1194)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:906)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:775)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:762)
	Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [Kernel@lh0tkcv6vin7pqjdt2gt, Rete(abortOnError=false, commands=capacity=2147483647,data=[onReceive], reteState=kotlinx.coroutines.flow.StateFlowImpl@35d019a3, dbSource=ReteDbSource(reteState=kotlinx.coroutines.flow.StateFlowImpl@35d019a3)), DbSourceContextElement(kernel lh0tkcv6vin7pqjdt2gt), ProjectImpl@1810327352, ClientIdPrecursor, CoroutineName(BackgroundHighlighter.updateHighlighted(DocumentImpl[BUILD])), StandaloneCoroutine{Cancelled}@72cce460, Dispatchers.Default]

[angelozerr]

@SergejSalnikov once https://github.com/redhat-developer/lsp4ij/actions/runs/33872932565 will be finished please install nighty.

[angelozerr]

Please install nighty, I have fixed your issue.