java.lang.LinkageError: loader constraint violation: loader (instance of org/netbeans/StandardModule$OneModuleClassLoader) previously initiated loading for a different type with name "com/sun/jdi/VirtualMachineManager"
   at org.netbeans.modules.debugger.jpda.ui.ConnectPanel.initConnectors(ConnectPanel.java:154)
   at org.netbeans.modules.debugger.jpda.ui.ConnectPanel.access$100(ConnectPanel.java:115)
   at org.netbeans.modules.debugger.jpda.ui.ConnectPanel$1.run(ConnectPanel.java:140)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)