Bug Info:
---------
NullPointerException has occured in Stylepad demo application in the following scenario.

JDK Info:
---------
java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b15)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b15, mixed mode, sharing)

Steps to Reproduce:
-------------------

1. Open Stylepad(JAVA_HOME/demo/jfc/Stylepad) demo application.

JAVA_HOME/bin/java -jar JAVA_HOME/demo/jfc/Stylepad/Stylepad.jar

2. Choose Dumpmodel to System.err option in Debug menu.

3. Choose ShowElements in Debug menu and then close the child window.

4. Click on save icon and then give some file name to save the document.

5. Click on Open icon and choose saved file and then clcik OK button.

6. See the console and it shows the following error details.


Error Info:
-----------

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at javax.swing.text.AbstractDocument$AbstractElement.readObject(AbstractDocument.java:2216)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1628)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1293)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
        at javax.swing.tree.TreePath.readObject(TreePath.java:310)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:468)
        at javax.swing.tree.TreePath.readObject(TreePath.java:308)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:468)
        at javax.swing.JTree.readObject(JTree.java:2556)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1628)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1293)
        at java.io.ObjectInputStream.access$300(ObjectInputStream.java:181)
        at java.io.ObjectInputStream$GetFieldImpl.readFields(ObjectInputStream.java:2073)
        at java.io.ObjectInputStream.readFields(ObjectInputStream.java:507)
        at java.awt.Container.readObject(Container.java:3492)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1628)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1293)
        at java.io.ObjectInputStream.access$300(ObjectInputStream.java:181)
        at java.io.ObjectInputStream$GetFieldImpl.readFields(ObjectInputStream.java:2073)
        at java.io.ObjectInputStream.readFields(ObjectInputStream.java:507)
        at java.awt.Container.readObject(Container.java:3492)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1628)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1293)
        at java.io.ObjectInputStream.access$300(ObjectInputStream.java:181)
        at java.io.ObjectInputStream$GetFieldImpl.readFields(ObjectInputStream.java:2073)
        at java.io.ObjectInputStream.readFields(ObjectInputStream.java:507)
        at java.awt.Container.readObject(Container.java:3492)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
        at javax.swing.event.EventListenerList.readObject(EventListenerList.java:255)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:468)
        at javax.swing.text.AbstractDocument.readObject(AbstractDocument.java:1436)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
        at Stylepad$OpenAction.actionPerformed(Stylepad.java:228)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1863)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2183)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
        at java.awt.Component.processMouseEvent(Component.java:5506)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3153)
        at java.awt.Component.processEvent(Component.java:5271)
        at java.awt.Container.processEvent(Container.java:1966)
        at java.awt.Component.dispatchEventImpl(Component.java:3958)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3806)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
        at java.awt.Container.dispatchEventImpl(Container.java:2010)
        at java.awt.Window.dispatchEventImpl(Window.java:1768)
        at java.awt.Component.dispatchEvent(Component.java:3806)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:591)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)





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