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https://issues.apache.org/jira/browse/NETBEANS-4460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17191761#comment-17191761
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Laszlo Kishalmi commented on NETBEANS-4460:
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Well, I think this shall be fixed in the C++ support module.
> C++ Code Completion not working
> -------------------------------
>
> Key: NETBEANS-4460
> URL: https://issues.apache.org/jira/browse/NETBEANS-4460
> Project: NetBeans
> Issue Type: Bug
> Components: cnd - Code Completion
> Affects Versions: 12.0, 11.2, 11.3
> Environment: Windows 10, msys64
> Reporter: Holger Weber
> Priority: Major
>
> Sometimes the Code Completion doesn't work. So creating a derived class and
> try to auto complete a constructor just shows "Please wait.." tool tip and a
> notification is created.
> Part of Log:
> SEVERE [org.openide.util.RequestProcessor]: Error in RequestProcessor
> org.netbeans.spi.editor.completion.support.AsyncCompletionTask
> java.lang.ClassCastException: org.openide.util.ImageUtilities$ToolTipImage
> cannot be cast to java.desktop/javax.swing.ImageIcon
> at
> org.netbeans.modules.cnd.refactoring.completion.overridemethod.CsmOverrideMethodCompletionItem.<init>(CsmOverrideMethodCompletionItem.java:112)
> at
> org.netbeans.modules.cnd.refactoring.completion.overridemethod.CsmOverrideMethodCompletionItem.createImplementItem(CsmOverrideMethodCompletionItem.java:139)
> at
> org.netbeans.modules.cnd.refactoring.completion.overridemethod.CsmOverrideMethodCompletionProvider$Query.getItems(CsmOverrideMethodCompletionProvider.java:242)
> at
> org.netbeans.modules.cnd.refactoring.completion.overridemethod.CsmOverrideMethodCompletionProvider$Query.query(CsmOverrideMethodCompletionProvider.java:125)
> at
> org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:198)
> at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
> at
> org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
> at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
> [catch] at
> org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
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