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The GLoaderBeanInfo class says that GLoader has a getExtensions() method which it does not: java.beans.IntrospectionException: No method "getExtensions" with 0 arg(s) at java.beans.Introspector.findMethod(Introspector.java:985) at java.beans.PropertyDescriptor.<init>(PropertyDescriptor.java:83) at org.netbeans.modules.antlr.GLoaderBeanInfo.initializeDescriptors(GLoaderBeanInfo.java:70) at org.netbeans.modules.antlr.GLoaderBeanInfo.getPropertyDescriptors(GLoaderBeanInfo.java:45) at java.beans.Introspector.getTargetPropertyInfo(Introspector.java:346) at java.beans.Introspector.getBeanInfo(Introspector.java:296) at java.beans.Introspector.getBeanInfo(Introspector.java:81) at org.netbeans.modules.projects.PSupport.hasGlobalAtrributeInBeanInfo(PSupport.java:539) at org.netbeans.modules.projects.PSupport.isProjectObject(PSupport.java:516) at org.netbeans.modules.projects.PSupport.getProjectObjects(PSupport.java:499) at org.netbeans.modules.projects.PSupport.projectSave(PSupport.java:323) at org.netbeans.modules.projects.PSupport$1.run(PSupport.java:788) at org.openide.util.Task.run(Task.java:124) at org.openide.util.RequestProcessor$ProcessorThread.run(RequestProcessor.java:626) This may be a carry-over from a previous version of MultiFileLoader which did have this method or may be completely bogus. Anyway, it needs updating with the available properties GLoader does have.
It probably used to be a UniFileLoader.
I think this was fixed as a byproduct of task 16555 secondary file recognition. We can always reopen it if not.