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This bug was originally marked as duplicate of bug 244396, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.0.2 (Build 20150924-debian-8.0.2) VM: OpenJDK 64-Bit Server VM, 24.91-b01, OpenJDK Runtime Environment, 1.7.0_91-b01 OS: Linux User Comments: GUEST: Trying to view help to find out workaround to another crippling exception. Stacktrace: java.lang.IllegalArgumentException: view is invalid at javax.help.search.MergingSearchEngine.merge(MergingSearchEngine.java:91) at javax.help.JHelpSearchNavigator.merge(JHelpSearchNavigator.java:168) at javax.help.plaf.basic.BasicSearchNavigatorUI.addSubHelpSets(BasicSearchNavigatorUI.java:275) at javax.help.plaf.basic.BasicSearchNavigatorUI.reloadData(BasicSearchNavigatorUI.java:225) at javax.help.plaf.basic.BasicSearchNavigatorUI.installUI(BasicSearchNavigatorUI.java:174) at javax.swing.JComponent.setUI(JComponent.java:656)
Created attachment 157412 [details] stacktrace
Created attachment 158852 [details] stacktrace press help
This bug already has 5 duplicates see http://statistics.netbeans.org/exceptions/detail.do?id=221260
Created attachment 163658 [details] stacktrace Under Ubuntu 16.04 clicking on the "Help " and then "Help Contents" in the menu (File-Edit-View-...-Help) does not work. It works fine on Windows 10 1607, so I get along well enough.