JDK1.2Beta4-I:Serialization bug on JFrame (Please run attached code)

java.io.NotSerializableException: java.lang.ref.SoftReference
        at java.io.ObjectOutputStream.outputObject(Compiled Code)
        at java.io.ObjectOutputStream.writeObject(Compiled Code)
        at java.io.ObjectOutputStream.outputClassFields(Compiled Code)
        at java.io.ObjectOutputStream.defaultWriteObject(Compiled Code)
        at java.awt.Frame.writeObject(Compiled Code)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectOutputStream.invokeObjectWriter(Compiled Code)
        at java.io.ObjectOutputStream.outputObject(Compiled Code)
        at java.io.ObjectOutputStream.writeObject(Compiled Code)
        at SerialTest.test(Compiled Code)
        at SerialTest.main(Compiled Code)
(fail): 1

bae-chul.kim@eng 1998-06-05