From @andxu on July 18, 2018 12:52

copied from microsoft/vscode-java-pack#27
@abhinavtk97
Issue Type: Bug

java.util.concurrent.CompletionException: org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Request workspace/executeClientCommand failed with message: command 'java.classpath.refresh' not found
at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1934)
at org.eclipse.jdt.ls.core.internal.JavaClientConnection.executeClientCommand(JavaClientConnection.java:81)
at com.microsoft.java.test.plugin.internal.JavaModelEventProvider.elementChanged(JavaModelEventProvider.java:55)
at org.eclipse.jdt.internal.core.DeltaProcessor$3.run(DeltaProcessor.java:1735)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyListeners(DeltaProcessor.java:1723)
at org.eclipse.jdt.internal.core.DeltaProcessor.fireReconcileDelta(DeltaProcessor.java:1574)
at org.eclipse.jdt.internal.core.DeltaProcessor.fire(DeltaProcessor.java:1533)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:774)
at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:799)
at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1319)
at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1278)
at org.eclipse.jdt.ls.core.internal.handlers.DocumentLifeCycleHandler.performValidation(DocumentLifeCycleHandler.java:134)
at org.eclipse.jdt.ls.core.internal.handlers.DocumentLifeCycleHandler.access$0(DocumentLifeCycleHandler.java:120)
at org.eclipse.jdt.ls.core.internal.handlers.DocumentLifeCycleHandler$1.runInWorkspace(DocumentLifeCycleHandler.java:88)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:39)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:60)
Caused by: org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Request workspace/executeClientCommand failed with message: command 'java.classpath.refresh' not found
at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleResponse(RemoteEndpoint.java:205)
at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:189)
at org.eclipse.jdt.ls.core.internal.ParentProcessWatcher.lambda$0(ParentProcessWatcher.java:83)
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:188)
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:90)
at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:95)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Extension version: 0.3.0
VS Code version: Code - Insiders 1.26.0-insider (bd953248ad6a8e2f8896bfb78b3ae40e0fd47426, 2018-07-06T05:17:37.386Z)
OS version: Windows_NT x64 10.0.16299

Copied from original issue: redhat-developer/vscode-java#591