This problem starts on Merlin-beta build 30. Tried it on the previous builds and it didn't show up.

While trying to serialize and deserialize JToolBar, the following exception gets thrown:

java.io.NotSerializableException: javax.swing.JToolBar$DefaultToolBarLayout
        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.awt.Container.writeObject(Container.java:1789)
        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:30)
        at TestSerialize.<init>(TestSerialize.java:17)
        at TestSerialize.main(TestSerialize.java:10)

Here is a simple test program to reproduce the problem:

---------------------------------------------------------------------------------

import java.io.*;

import javax.swing.*;

public class TestSerialize {

    JToolBar toolBar1;

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

    public TestSerialize() {
        toolBar1 = new JToolBar();

        try {
            serializeAndDeserialize(toolBar1);
        } 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 2000-09-01
Swing SQE