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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: sun.swing.table.DefaultTableCellHeaderRenderer$EmptyIcon	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)	at javax.swing.table.JTableHeader.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeObject(Unknown Source)	at javax.swing.event.EventListenerList.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)	at javax.swing.JTable.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeArray(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.access$300(Unknown Source)	at java.io.ObjectOutputStream$PutFieldImpl.writeFields(Unknown Source)	at java.io.ObjectOutputStream.writeFields(Unknown Source)	at java.awt.Container.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeArray(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.access$300(Unknown Source)	at java.io.ObjectOutputStream$PutFieldImpl.writeFields(Unknown Source)	at java.io.ObjectOutputStream.writeFields(Unknown Source)	at java.awt.Container.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeArray(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.access$300(Unknown Source)	at java.io.ObjectOutputStream$PutFieldImpl.writeFields(Unknown Source)	at java.io.ObjectOutputStream.writeFields(Unknown Source)	at java.awt.Container.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeArray(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.access$300(Unknown Source)	at java.io.ObjectOutputStream$PutFieldImpl.writeFields(Unknown Source)	at java.io.ObjectOutputStream.writeFields(Unknown Source)	at java.awt.Container.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeArray(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.access$300(Unknown Source)	at java.io.ObjectOutputStream$PutFieldImpl.writeFields(Unknown Source)	at java.io.ObjectOutputStream.writeFields(Unknown Source)	at java.awt.Container.writeObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeObject(Unknown Source)	at undefined.CheckInInformationFrame.main(CheckInInformationFrame.java:64)