CancellationException while server is stopping

[fbricon]

Looks like this happened while an LS was stopping apparently:

Error while collecting LSP CodeLens

java.util.concurrent.ExecutionException: java.util.concurrent.CancellationException
	at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2096)
	at com.redhat.devtools.lsp4ij.internal.CompletableFutures.waitUntilDone(CompletableFutures.java:103)
	at com.redhat.devtools.lsp4ij.operations.codelens.LSPCodeLensProvider.computeCodeVision(LSPCodeLensProvider.java:104)
	at com.redhat.devtools.lsp4ij.operations.codelens.LSPCodeLensProvider.computeCodeVision(LSPCodeLensProvider.java:55)
	at com.intellij.codeInsight.codeVision.CodeVisionHost$calculateFrontendLenses$2.invoke(CodeVisionHost.kt:441)
	at com.intellij.codeInsight.codeVision.CodeVisionHost$calculateFrontendLenses$2.invoke(CodeVisionHost.kt:410)
	at com.intellij.codeInsight.codeVision.CodeVisionHost.executeOnPooledThread$lambda$11$lambda$10(CodeVisionHost.kt:498)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:192)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:610)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:685)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:641)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:609)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:78)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:179)
	at com.intellij.codeInsight.codeVision.CodeVisionHost.executeOnPooledThread$lambda$11(CodeVisionHost.kt:498)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804)
	at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:702)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:699)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:699)
	at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: java.util.concurrent.CancellationException
	at java.base/java.util.concurrent.CompletableFuture.cancel(CompletableFuture.java:2478)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.stop(LanguageServerWrapper.java:557)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.stop(LanguageServerWrapper.java:540)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.start(LanguageServerWrapper.java:300)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.getInitializedServer(LanguageServerWrapper.java:809)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.lambda$getLanguageServers$2(LanguageServiceAccessor.java:113)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:575)
	at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
	at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:616)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.lambda$getLanguageServers$4(LanguageServiceAccessor.java:127)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
	at java.base/java.util.concurrent.ForkJoinPool$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)

This showed up as an error popup in the UI

[fbricon]

FTR I was testing the build from #137

[fbricon]

Saw similar issue, after, I think, changing the typescript command providing an invalid launch command:

java.util.concurrent.CompletionException: java.util.concurrent.CancellationException
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:332)
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:347)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:636)
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
	at java.base/java.util.concurrent.CompletableFuture.cancel(CompletableFuture.java:2480)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.stop(LanguageServerWrapper.java:557)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.stop(LanguageServerWrapper.java:540)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.start(LanguageServerWrapper.java:300)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.getInitializedServer(LanguageServerWrapper.java:809)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.lambda$getLanguageServers$2(LanguageServiceAccessor.java:113)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:575)
	at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
	at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:616)
	at com.redhat.devtools.lsp4ij.LanguageServiceAccessor.lambda$getLanguageServers$4(LanguageServiceAccessor.java:127)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
	at java.base/java.util.concurrent.ForkJoinPool$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.util.concurrent.CancellationException
	at java.base/java.util.concurrent.CompletableFuture.cancel(CompletableFuture.java:2478)
	... 21 more