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java.io.InvalidClassException: com.dtn.petro2.petroadmin.NodeUserObject; no valid constructor at java.io.ObjectStreamClass.<init>(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)