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java.lang.NoClassDefFoundError: net.jini.loader.pref.PreferredClassProvider	at java.rmi.server.RMIClassLoader.initializeProvider(RMIClassLoader.java:687)	at java.rmi.server.RMIClassLoader.access$000(RMIClassLoader.java:110)	at java.rmi.server.RMIClassLoader$1.run(RMIClassLoader.java:120)	at java.rmi.server.RMIClassLoader$1.run(RMIClassLoader.java:119)	at java.security.AccessController.doPrivileged(Native Method)	at java.rmi.server.RMIClassLoader.(RMIClassLoader.java:117)	at net.jini.loader.ClassLoading.loadClass(ClassLoading.java:138)	at net.jini.io.MarshalInputStream.resolveClass(MarshalInputStream.java:296)	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)	at net.jini.io.MarshalledInstance.get(MarshalledInstance.java:358)	at com.sun.jini.discovery.DiscoveryV1.doUnicastDiscovery(DiscoveryV1.java:397)	at net.jini.discovery.LookupDiscovery$13.run(LookupDiscovery.java:3327)	at java.security.AccessController.doPrivileged(Native Method)	at net.jini.discovery.LookupDiscovery.doUnicastDiscovery(LookupDiscovery.java:3324)	at net.jini.discovery.LookupDiscovery.doUnicastDiscovery(LookupDiscovery.java:3355)	at net.jini.discovery.LookupDiscovery.access$3900(LookupDiscovery.java:696)	at net.jini.discovery.LookupDiscovery$UnicastDiscoveryTask.run(LookupDiscovery.java:1744)	at com.sun.jini.thread.TaskManager$TaskThread.run(TaskManager.java:331)