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    Exception in thread "main" java.io.NotSerializableException: java.util.Hashtable$Enumerator at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSe

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java.io.NotSerializableException: weblogic.servlet.internal.ServletRequestImpl	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)	at java.util.Hashtable.writeObject(Hashtable.java:802)	at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:795)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1294)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)	at weblogic.servlet.internal.session.SessionData.writeExternal(SessionData.java:906)	at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1265)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1243)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)	at weblogic.servlet.internal.session.FileSessionContext.sync(FileSessionContext.java:325)	at weblogic.servlet.internal.ServletRequestImpl.syncSession(ServletRequestImpl.java:2433)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3691)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2585)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)