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This bug was originally marked as duplicate of bug 247884, 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-178-on-20150729) VM: Java HotSpot(TM) 64-Bit Server VM, 25.45-b02, Java(TM) SE Runtime Environment, 1.8.0_45-b14 OS: Windows 8.1 User Comments: marckoby: updates, restart dj_pilgrim: On application start Stacktrace: java.lang.IllegalStateException: Module org.netbeans.modules.java.source.base is already enabled at org.netbeans.ModuleManager.attachModuleFragment(ModuleManager.java:1019) at org.netbeans.ModuleManager.maybeAddToEnableList(ModuleManager.java:1585) at org.netbeans.ModuleManager.maybeAddToEnableList(ModuleManager.java:1595) at org.netbeans.ModuleManager.simulateEnable(ModuleManager.java:1534) at org.netbeans.ModuleManager.simulateEnable(ModuleManager.java:1508) at org.netbeans.modules.autoupdate.services.OperationValidator$EnableValidator.getModulesToEnable(OperationValidator.java:363)
Created attachment 155245 [details] stacktrace
This is only reported for one dev. build from 15/07/29. Closing as fixed.