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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: org.apache.catalina.session.StandardSessionFacade	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.writeObject(ObjectOutputStream.java:278)	at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1381)	at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:863)	at org.apache.catalina.session.FileStore.save(FileStore.java:409)	at org.apache.catalina.session.PersistentManagerBase.writeSession(PersistentManagerBase.java:760)	at org.apache.catalina.session.PersistentManagerBase.processMaxIdleBackups(PersistentManagerBase.java:1064)	at org.apache.catalina.session.PersistentManagerBase.processPersistenceChecks(PersistentManagerBase.java:527)	at org.apache.catalina.session.PersistentManagerBase.run(PersistentManagerBase.java:1142)	at java.lang.Thread.run(Thread.java:536)