Extension randomly crashes on hovering a symbol ("Request textDocument/hover failed")

Hi, from time to time the extension crashes when I hover with pressed control key over a symbol [1]. I can continue coding, but e.g. Goto and code completion gets unresponsive so I have to restart the Actionscript/MXML server. Unfortunately, I can’t reproduce this issue on demand. It seems to me that it happens randomly… not sure… I have to observe this a bit more. I would say I never ran into this with v0.14.0.

I am using Flex with AIR on Windows7 here,

Thanks! Olaf

[1]

[Error - 12:58:20 PM] Request textDocument/hover failed.
  Message: Internal error.
  Code: -32603 
java.util.concurrent.CompletionException: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:604)
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException
	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2214)
	at com.google.common.cache.LocalCache.get(LocalCache.java:4053)
	at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4057)
	at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4986)
	at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4992)
	at org.apache.royale.compiler.internal.projects.CompilerProject.getCacheForScope(CompilerProject.java:676)
	at org.apache.royale.compiler.internal.definitions.InterfaceDefinition.resolveExtendedInterfaces(InterfaceDefinition.java:122)
	at org.apache.royale.compiler.internal.definitions.TypeDefinitionBase$TypeIterator.pushChildren(TypeDefinitionBase.java:290)
	at org.apache.royale.compiler.internal.definitions.TypeDefinitionBase$TypeIterator.next(TypeDefinitionBase.java:217)
	at org.apache.royale.compiler.internal.definitions.TypeDefinitionBase$TypeIterator.next(TypeDefinitionBase.java:175)
	at org.apache.royale.compiler.internal.scopes.TypeScope.getPropertyForScopeChain(TypeScope.java:262)
	at org.apache.royale.compiler.internal.scopes.ScopeView.getPropertyForScopeChain(ScopeView.java:72)
	at org.apache.royale.compiler.internal.scopes.ASScope.findProperty(ASScope.java:1119)
	at org.apache.royale.compiler.internal.scopes.ASScope.findProperty(ASScope.java:1061)
	at org.apache.royale.compiler.internal.scopes.ASScope.findProperty(ASScope.java:1277)
	at org.apache.royale.compiler.internal.scopes.ASScope.findProperty(ASScope.java:999)
	at org.apache.royale.compiler.internal.scopes.ASScopeCache.findProperty(ASScopeCache.java:153)
	at org.apache.royale.compiler.internal.scopes.ASScope.findProperty(ASScope.java:1428)
	at org.apache.royale.compiler.internal.tree.as.IdentifierNode.resolve(IdentifierNode.java:394)
	at com.as3mxml.vscode.ActionScriptTextDocumentService.actionScriptHoverWithNode(ActionScriptTextDocumentService.java:3389)
	at com.as3mxml.vscode.ActionScriptTextDocumentService.actionScriptHover(ActionScriptTextDocumentService.java:3370)
	at com.as3mxml.vscode.ActionScriptTextDocumentService.lambda$hover$1(ActionScriptTextDocumentService.java:526)
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)
	... 5 more
Caused by: java.lang.NullPointerException
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770)
	at com.google.common.cache.LocalCache.get(LocalCache.java:4052)
	at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4057)
	at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4986)
	at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4992)
	at org.apache.royale.compiler.internal.scopes.ASProjectScope.addScopeToCompilationUnitScopeList(ASProjectScope.java:1310)
	at org.apache.royale.compiler.internal.projects.CompilerProject$ScopeCacheLoader.load(CompilerProject.java:107)
	at org.apache.royale.compiler.internal.projects.CompilerProject$ScopeCacheLoader.load(CompilerProject.java:96)
	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3628)
	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2336)
	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2295)
	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2208)
	... 27 more

[olafkrueger]

I am using v0.16.0 now and will observe if the issue is fixed. Thank you so much for the new release!

[joshtynjala]

Earlier today, I committed a fix for a potential multi-threading conflict. The fix will be included in the upcoming v0.16. If we’re lucky, your issue may be fixed after the update.