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java.io.InvalidClassException: com.dtn.petro2.petroadmin.NodeUserObject; no valid constructor	at java.io.ObjectStreamClass.(ObjectStreamClass.java:428)	at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:268)	at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:504)	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1546)	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)	at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1628)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1293)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)	at javax.swing.tree.DefaultMutableTreeNode.readObject(DefaultMutableTreeNode.java:1281)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)	at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1628)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1293)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)	at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:468)	at javax.swing.tree.DefaultMutableTreeNode.readObject(DefaultMutableTreeNode.java:1279)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)	at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1671)	at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:968)	at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:414)	at org.apache.catalina.session.StandardManager.load(StandardManager.java:341)	at org.apache.catalina.session.StandardManager.start(StandardManager.java:681)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4472)	at com.sun.enterprise.web.WebModule.start(WebModule.java:241)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1086)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:847)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1086)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:483)	at org.apache.catalina.startup.Embedded.start(Embedded.java:894)	at com.sun.enterprise.web.WebContainer.start(WebContainer.java:741)	at com.sun.enterprise.web.PEWebContainer.startInstance(PEWebContainer.java:515)	at com.sun.enterprise.web.PEWebContainerLifecycle.onStartup(PEWebContainerLifecycle.java:54)	at com.sun.enterprise.server.ApplicationServer.onStartup(ApplicationServer.java:300)	at com.sun.enterprise.server.PEMain.run(PEMain.java:294)	at com.sun.enterprise.server.PEMain.main(PEMain.java:220)