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This issue was reported manually by eviweb. It already has 1 duplicates Build: NetBeans IDE 7.4 (Build 201310111528) VM: Java HotSpot(TM) 64-Bit Server VM, 25.0-b61, Java(TM) SE Runtime Environment, 1.8.0-ea-b119 OS: Linux User Comments: GUEST: seems to be thrown for unknown file types step to reproduce : - in your system create a folder with a text file without extension (ie: LICENSE) - in netbeans, create a new project > Misc > Ad-Hoc Project - browse to the created folder and valid - try to edit the text file from the project Sources node I encountered the same issue when editing a bash script while the C/C++ module wasn't activated. Stacktrace: java.lang.NullPointerException at com.timboudreau.adhoc.project.AdhocProjectNode$ProxyOpenFilterChildren$FN$SimpleWrapper.addPropertyChangeListener(AdhocProjectNode.java:546) at org.openide.awt.Actions$Bridge.addNotify(Actions.java:908) at org.openide.awt.Actions$MenuBridge.prepare(Actions.java:1219) at org.openide.awt.Actions.connect(Actions.java:201) at org.openide.awt.Actions$MenuItem.<init>(Actions.java:1571) at org.netbeans.modules.openide.awt.DefaultAWTBridge.createPopupPresenter(DefaultAWTBridge.java:91)
Created attachment 143143 [details] stacktrace
A bug in third-party code: com.timboudreau.adhoc.project.AdhocProjectNode$ProxyOpenFilterChildren Uninstall that plugin and you should be fine.