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This bug was originally marked as duplicate of bug 222000, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 (Build 201510222201) VM: Java HotSpot(TM) Client VM, 25.60-b23, Java(TM) SE Runtime Environment, 1.8.0_60-b27 OS: Linux User Comments: GUEST: Another one Stacktrace: java.lang.NullPointerException at org.netbeans.modules.html.editor.hints.css.CssClassesVisitor.<init>(CssClassesVisitor.java:79) at org.netbeans.modules.html.editor.hints.css.MissingClassRule.run(MissingClassRule.java:92) at org.netbeans.modules.html.editor.hints.HtmlHintsProvider.computeErrors(HtmlHintsProvider.java:321) at org.netbeans.modules.csl.hints.GsfHintsProvider.processProviderErrors(GsfHintsProvider.java:322) at org.netbeans.modules.csl.hints.GsfHintsProvider.processErrors(GsfHintsProvider.java:408) at org.netbeans.modules.csl.hints.GsfHintsProvider.processErrorsRecursive(GsfHintsProvider.java:384)
Created attachment 162296 [details] stacktrace
There is corrupted index, I would clean netbeans home directory or start new one.