In merlin, the type of field 'fRequestedAttributes' in java.awt.Font was changed
from java.util.Hashtable to java.util.HashMap. Since 'fRequestedAttributes' is
non-transient, Font is Serializable, and Font.writeObject uses default
serialzation, the type of this field cannot change. Otherwise, kestrel cannot
read Fonts serialized by merlin, and merlin cannot read Fonts serialized by
kestrel.

To reproduce this bug, run the test test/java/awt/CONFORMANCE under kestrel.
From the test menu, select "Persistent serialization" and then "Save serialized
state...". Choose a file name, save, and exit. Restart the test with merlin
and selection "Load serialized state...". Load in the file you just created.
You will the see the following:

java.lang.ClassCastException: Assigning instance of class java.util.Hashtable to field java.awt.Font#fRequestedAttributes
        at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2270)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
        at java.awt.Font.readObject(Font.java:953)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectInputStream.invokeObjectReader(ObjectInputStream.java:2213)
        at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1410)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
        at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2262)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)
        at java.awt.Component.readObject(Component.java:5723)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.io.ObjectInputStream.invokeObjectReader(ObjectInputStream.java:2213)
        at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1410)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)
        at AWTConformanceTest.loadSerializedFile(AWTConformanceTest.java:424)
        at AWTConformanceTest.loadSerialize(AWTConformanceTest.java:439)
        at AWTConformanceTest.actionPerformed(AWTConformanceTest.java:371)
        at AWTConformanceTest.actionPerformed(AWTConformanceTest.java:337)
        at java.awt.MenuItem.processActionEvent(MenuItem.java:540)
        at java.awt.MenuItem.processEvent(MenuItem.java:504)
        at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:276)
        at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:266)
        at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:278)
        at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:266)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:425)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:122)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:118)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)
Serialization error -- please file a bug report


A similar error will appear if you attempt to read a merlin byte stream in
kestrel.