Error logs show in the output filew

Environment

Operating System: MacOS Sierra 10.12.6
JDK version: 1.8.0_131
Visual Studio Code version: 1.16.1
Java extension version: 0.10.1
Steps To Reproduce

When open a project base folder, there are some error logs show in the output console.
Output Exception:
Error - 11:02:43] Sep 21, 2017 11:01:54 AM Error computing hover
null
org.eclipse.core.runtime.OperationCanceledException
	at org.eclipse.core.runtime.SubMonitor$RootInfo.checkForCancellation(SubMonitor.java:276)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:984)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:897)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:223)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:583)
	at org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:600)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.isResolved(HoverInfoProvider.java:127)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.computeHover(HoverInfoProvider.java:100)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.computeHover(HoverHandler.java:40)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.hover(HoverHandler.java:31)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$5(JDTLanguageServer.java:302)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
	at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

[Error - 11:02:44] Sep 21, 2017 11:01:54 AM Error computing hover
null
org.eclipse.core.runtime.OperationCanceledException
	at org.eclipse.jdt.internal.core.search.processing.JobManager.performConcurrentJob(JobManager.java:222)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:220)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:583)
	at org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:600)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.isResolved(HoverInfoProvider.java:127)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.computeHover(HoverInfoProvider.java:100)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.computeHover(HoverHandler.java:40)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.hover(HoverHandler.java:31)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$5(JDTLanguageServer.java:302)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
	at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

[Error - 11:03:49] Sep 21, 2017 11:01:54 AM Error computing hover
null
org.eclipse.core.runtime.OperationCanceledException
	at org.eclipse.jdt.internal.core.search.matching.MatchLocator.parseAndBuildBindings(MatchLocator.java:1797)
	at org.eclipse.jdt.internal.core.search.matching.MatchLocator.locateMatches(MatchLocator.java:1232)
	at org.eclipse.jdt.internal.core.search.matching.MatchLocator.locateMatches(MatchLocator.java:1337)
	at org.eclipse.jdt.internal.core.search.matching.MatchLocator.locateMatches(MatchLocator.java:1469)
	at org.eclipse.jdt.internal.core.search.JavaSearchParticipant.locateMatches(JavaSearchParticipant.java:122)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:236)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:583)
	at org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:600)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.isResolved(HoverInfoProvider.java:127)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.computeHover(HoverInfoProvider.java:100)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.computeHover(HoverHandler.java:40)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.hover(HoverHandler.java:31)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$5(JDTLanguageServer.java:302)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
	at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

[Error - 11:03:50] Sep 21, 2017 11:01:54 AM Error computing hover
null
org.eclipse.core.runtime.OperationCanceledException
	at org.eclipse.core.runtime.SubMonitor$RootInfo.checkForCancellation(SubMonitor.java:276)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:984)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:897)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:223)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:583)
	at org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:600)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.isResolved(HoverInfoProvider.java:127)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.computeHover(HoverInfoProvider.java:100)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.computeHover(HoverHandler.java:40)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.hover(HoverHandler.java:31)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$5(JDTLanguageServer.java:302)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
	at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

[Error - 11:04:02] Sep 21, 2017 11:01:54 AM Error computing hover
null
org.eclipse.core.runtime.OperationCanceledException
	at org.eclipse.core.runtime.SubMonitor$RootInfo.checkForCancellation(SubMonitor.java:276)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:984)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:897)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:223)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:583)
	at org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:600)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.isResolved(HoverInfoProvider.java:127)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.computeHover(HoverInfoProvider.java:100)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.computeHover(HoverHandler.java:40)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.hover(HoverHandler.java:31)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$5(JDTLanguageServer.java:302)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
	at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

[Error - 11:05:16] Sep 21, 2017 11:01:54 AM Error computing hover
null
org.eclipse.core.runtime.OperationCanceledException
	at org.eclipse.core.runtime.SubMonitor$RootInfo.checkForCancellation(SubMonitor.java:276)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:984)
	at org.eclipse.core.runtime.SubMonitor.split(SubMonitor.java:897)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:223)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:583)
	at org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:600)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.isResolved(HoverInfoProvider.java:127)
	at org.eclipse.jdt.ls.core.internal.HoverInfoProvider.computeHover(HoverInfoProvider.java:100)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.computeHover(HoverHandler.java:40)
	at org.eclipse.jdt.ls.core.internal.handlers.HoverHandler.hover(HoverHandler.java:31)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$5(JDTLanguageServer.java:302)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
	at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Log:
log.txt