java.lang.ClassNotFoundException: weblogic.rmi.extensions.DisconnectListener
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Caused: java.lang.NoClassDefFoundError: weblogic/rmi/extensions/DisconnectListener
   at java.lang.ClassLoader.defineClass1(ClassLoader.java:0)
   at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
   at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
   at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
   at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
   at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
   at java.lang.Class.forName0(Class.java:0)
   at java.lang.Class.forName(Class.java:247)
   at javax.management.remote.JMXConnectorFactory.getProvider(JMXConnectorFactory.java:470)
   at javax.management.remote.JMXConnectorFactory.getProvider(JMXConnectorFactory.java:396)
   at javax.management.remote.JMXConnectorFactory.newJMXConnector(JMXConnectorFactory.java:296)
   at org.netbeans.modules.j2ee.weblogic9.WLConnectionSupport$1.call(WLConnectionSupport.java:121)
   at org.netbeans.modules.j2ee.weblogic9.WLConnectionSupport.executeAction(WLConnectionSupport.java:78)
   at org.netbeans.modules.j2ee.weblogic9.WLConnectionSupport.executeAction(WLConnectionSupport.java:103)
   at org.netbeans.modules.j2ee.weblogic9.deploy.WLDeploymentManager.getTargets(WLDeploymentManager.java:461)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.getTargetMap(ServerInstance.java:557)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.getTargets(ServerInstance.java:515)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance._retrieveTarget(ServerInstance.java:1793)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.isSuspended(ServerInstance.java:976)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance$1.run(ServerInstance.java:387)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NoClassDefFoundError: weblogic/rmi/extensions/DisconnectListener
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:421)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.refresh(ServerInstance.java:363)
   at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.start(ServerInstance.java:1086)
   at org.netbeans.modules.j2ee.deployment.impl.ui.actions.StartAction$1.run(StartAction.java:110)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1426)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)