FULL PRODUCT VERSION :
java version "1.4.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)

FULL OPERATING SYSTEM VERSION : customer  Windows XP
[Version 5.1.2600]


A DESCRIPTION OF THE PROBLEM :
JTextField cant be serialized when JTextField instance is containing Japanese characters.

import java.io.*;
import javax.swing.*;

public class Test {
   public static void main(String[] args) throws Exception {
      JTextField ta = new JTextField("ã??"); // Japanese Character
      ObjectOutputStream out = new ObjectOutputStream(System.out);
      out.writeObject(ta);
      out.close();
   }
}


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile and run the code

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.io.NotSerializableException: java.lang.Object
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
        at java.util.Hashtable.writeObject(Hashtable.java:801)
        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: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.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 Test.main(Test.java:17)

REPRODUCIBILITY :
This bug can be reproduced always.
(Review ID: 166410) 
======================================================================

N/A

Serialization is failing because the JTextField instance, somewhere in its
graph of non-transient field values, contains an instance of java.lang.Object,
which is not serializable.

The offending object appears to be located at:

JTextField, field JTextComponent.model
  [AbstractDocument subclass], field AbstractDocument.documentProperties
     Hashtable.writeObject()
       java.lang.Object (appears to be a key in the hashtable)

  xxxxx@xxxxx   2002-10-31

I should add that the serialization failure occurs in JDK >= 1.3.1, but not
in 1.3.0 or 1.2.2.

  xxxxx@xxxxx   2002-10-31