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This bug was originally marked as duplicate of bug 216892, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build nbms-and-javadoc-1215-on-20140120) VM: Java HotSpot(TM) 64-Bit Server VM, 24.51-b03, Java(TM) SE Runtime Environment, 1.7.0_51-b13 OS: Linux User Comments: estephanz: Tried updating! Stacktrace: java.lang.NoClassDefFoundError: org/netbeans/updater/XMLUtil at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.newEntityResolver(AutoupdateCatalogParser.java:115) at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.<init>(AutoupdateCatalogParser.java:84) at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getUpdateItems(AutoupdateCatalogParser.java:196) at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getUpdateItems(AutoupdateCatalogProvider.java:143) at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getDescription(AutoupdateCatalogProvider.java:106) at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.getDescription(UpdateUnitProviderImpl.java:113)
Created attachment 146096 [details] stacktrace
It's NetBeans 7.4 installation originally. The fix went to NetBeans 8.0. I suggest to install NetBeans 8.0 from https://netbeans.org/downloads/ as replacement of your current installation.