java.io.InvalidClassException: com.dtn.petro2.petroadmin.NodeUserObject; no valid constructor

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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 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 com.sun.enterprise.web.WebContainer.start(WebContainer.java:741)
at com.sun.enterprise.web.PEWebContainer.startInstance(PEWebContainer.java:515)
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)

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