Run the following program and you should get the following message:

java.io.NotSerializableException: javax.swing.TransferHandler$DropHandler
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:1148)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:366)
        at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:1841)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:480)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:1214)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:366)
        at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:1841)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:480)
        at java.awt.Component.writeObject(Component.java:4842)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectOutputStream.invokeObjectWriter(ObjectOutputStream.java:1878)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:1210)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:366)
        at TestSerialize.serializeAndDeserialize(TestSerialize.java:29)
        at TestSerialize.<init>(TestSerialize.java:16)
        at TestSerialize.main(TestSerialize.java:9)

This happens for the following components:

DefaultCellEditor, JTextField, JList, JEditorPane, JTextArea, JPasswordField, JTextPane, TableColumn

The TransferHandler class, which is for the new DnD feature, is not serializable which I assume is why these components are failing since all these components creates an instance of this object.


------------------------------------------------------------------------------
import java.io.*;

import javax.swing.*;
import javax.swing.table.*;

public class TestSerialize {

    public static void main(String[] args) {
        new TestSerialize();
    }

    public TestSerialize() {
        Object target = new JTextField();

        try {
            serializeAndDeserialize(target);
        } catch(Exception e) {
            e.printStackTrace();
        }

        System.exit(0);
    }

    private Object serializeAndDeserialize(Object toWrite)
        throws ClassNotFoundException, IOException {

        FileOutputStream fos = new FileOutputStream("cereal.dat");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(toWrite);
        oos.flush();
        fos.close();

        FileInputStream fis = new FileInputStream("cereal.dat");
        ObjectInputStream ois = new ObjectInputStream(fis);
        Object retVal = ois.readObject();
        fis.close();

        return retVal;
    }
}
------------------------------------------------------------------------------



edmund.lou@eng 2000-09-28
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