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This bug was originally marked as duplicate of bug 213969, 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 201411181905) VM: Java HotSpot(TM) Client VM, 25.40-b25, Java(TM) SE Runtime Environment, 1.8.0_40-b25 OS: Windows 7 User Comments: vanob: Created new json file Stacktrace: java.lang.NullPointerException: displayName attribute not specified for org.netbeans.modules.javascript2.editor.JsonLanguage at org.netbeans.core.spi.multiview.MultiViewFactory$MapMVD.get(MultiViewFactory.java:390) at org.netbeans.core.spi.multiview.MultiViewFactory$MapMVD.getDisplayName(MultiViewFactory.java:408) at org.netbeans.core.multiview.TabsComponent.createButton(TabsComponent.java:591) at org.netbeans.core.multiview.TabsComponent.setModel(TabsComponent.java:158) at org.netbeans.core.multiview.MultiViewPeer.setMimeLookup(MultiViewPeer.java:174) at org.netbeans.core.multiview.MultiViewCloneableTopComponent.setMimeLookup(MultiViewCloneableTopComponent.java:101)
Created attachment 152863 [details] stacktrace