I tried to serialize DefaultTreeModel with Motif Look&Feel and I got not-serializable TreeLeafIcon exception below:

java.io.NotSerializableException: java.awt.swing.motif.MotifTreeCellRenderer$Tre
eLeafIcon
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:718)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:251)
        at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:
1347)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java
:348)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:765)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:251)
        at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:
1347)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java
:348)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:765)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:251)
        at java.io.ObjectOutputStream.outputArray(ObjectOutputStream.java:695)
        at java.io.ObjectOutputStream.checkSpecialClasses(ObjectOutputStream.jav
a:328)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:199)
        at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:
1347)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java
:348)
        at java.awt.Container.writeObject(Container.java:1268)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectOutputStream.invokeObjectWriter(ObjectOutputStream.java
:1366)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:761)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:251)
        at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:
1347)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java
:348)
        at java.awt.swing.basic.BasicTreeUI.writeObject(BasicTreeUI.java:1588)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectOutputStream.invokeObjectWriter(ObjectOutputStream.java
:1366)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:761)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:251)
        at java.awt.swing.event.EventListenerList.writeObject(EventListenerList.
java:214)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectOutputStream.invokeObjectWriter(ObjectOutputStream.java
:1366)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:761)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:251)
        at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:
1347)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java
:348)
        at java.awt.swing.tree.DefaultTreeModel.writeObject(DefaultTreeModel.jav
a:403)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectOutputStream.invokeObjectWriter(ObjectOutputStream.java
:1366)
        at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:761)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:251)
        at SerialListTest$1.actionPerformed(SerialListTest.java:33)
        at java.awt.swing.AbstractButton.fireActionPerformed(AbstractButton.java
:765)
        at java.awt.swing.AbstractButton$ForwardActionEvents.actionPerformed(Abs
tractButton.java:800)
        at java.awt.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonMo
del.java:314)
        at java.awt.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:
212)
        at java.awt.swing.basic.BasicButtonListener.mouseReleased(BasicButtonLis
tener.java:137)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:2
29)
        at java.awt.Component.processMouseEvent(Component.java:2495)
        at java.awt.Component.processEvent(Component.java:2338)
        at java.awt.Container.processEvent(Container.java:889)
        at java.awt.Component.dispatchEventImpl(Component.java:1909)
        at java.awt.Container.dispatchEventImpl(Container.java:934)
        at java.awt.Component.dispatchEvent(Component.java:1824)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:1541
)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1450)

        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1382)
        at java.awt.Container.dispatchEventImpl(Container.java:921)
        at java.awt.Window.dispatchEventImpl(Window.java:517)
        at java.awt.Component.dispatchEvent(Component.java:1824)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:45)