NPE occurs on opening a file which was created and saved with stylepad demo.

I tested on solsparc6, solsparc8, linux RH7.1, winNT and win2K and was able to reproduce this problem on all these configs with Merlin B75.

Steps to Reproduce:

1) Launch Stylepad demo.
2) In the demo window, click on "Create a New file" button.
3) Enter some text in the new file.
4) Save this new file by clicking the "Save to a file" button.
5) Again click the "Create a New file" button to make sure the stylepad window becomes blank.
6) Now try to open the file which you saved by clicking "Open a file" button and selecting the filename in the file dialog which opens.
On doing so, NPE occurs on the console.

The following exception was raised:
java.lang.NullPointerException
        at javax.swing.text.AbstractDocument$AbstractElement.readObject(AbstractDocument.java:2218)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
        at java.lang.reflect.Method.invoke(Method.java:313)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:816)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1721)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1818)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:445)
        at javax.swing.text.AbstractDocument$AbstractElement.readObject(AbstractDocument.java:2214)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
        at java.lang.reflect.Method.invoke(Method.java:313)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:816)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1721)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1818)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1744)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1818)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1744)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:323)
        at javax.swing.event.SwingPropertyChangeSupport.readObject(SwingPropertyChangeSupport.java:320)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
        at java.lang.reflect.Method.invoke(Method.java:313)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:816)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1721)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1818)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:445)
        at javax.swing.JComponent.readObject(JComponent.java:5041)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
        at java.lang.reflect.Method.invoke(Method.java:313)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:816)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1721)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1818)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1744)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:323)
        at javax.swing.event.EventListenerList.readObject(EventListenerList.java:258)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
        at java.lang.reflect.Method.invoke(Method.java:313)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:816)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1721)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1818)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:445)
        at javax.swing.text.AbstractDocument.readObject(AbstractDocument.java:1431)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
        at java.lang.reflect.Method.invoke(Method.java:313)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:816)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1721)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1624)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1252)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:323)
        at Stylepad$OpenAction.actionPerformed(Stylepad.java:231)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1770)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1823)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:422)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:260)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:261)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:230)
        at java.awt.Component.processMouseEvent(Component.java:4992)
        at java.awt.Component.processEvent(Component.java:4791)
        at java.awt.Container.processEvent(Container.java:1383)
        at java.awt.Component.dispatchEventImpl(Component.java:3501)
        at java.awt.Container.dispatchEventImpl(Container.java:1440)
        at java.awt.Component.dispatchEvent(Component.java:3363)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3195)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2906)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2842)
        at java.awt.Container.dispatchEventImpl(Container.java:1426)
        at java.awt.Window.dispatchEventImpl(Window.java:1568)
        at java.awt.Component.dispatchEvent(Component.java:3363)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:193)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:147)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:141)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:133)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:101)


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