Very weird behavior of OptionalFieldEditor

Hi,

I am using the following editor to support a nullable list:

public class NullableListEditor<T, E extends Editor<T>> extends Composite implements IsEditor<OptionalFieldEditor< List<T>, ListEditor<T,E> >> {
private ListEditor<T, E> list = ListEditor.of(new ListEditorSource());
private final OptionalFieldEditor<List<T>, ListEditor<T, E> > editor = OptionalFieldEditor.of(list);
… }

NullableListEditor for type A and B:
public class NullableAListEditor extends NullableListEditor<A, AEditor> {..}
public class NullableBListEditor extends NullableListEditor<B, BEditor> {..}

If I use both editors in my application, say first create NullableAListEditor and then NullableBListEditor, NullableAListEditor will work fine but NullableBListEditor will fail with Error:
java.lang.ClassCastException: ..editor.B.BEditor cannot be cast to ...editor.A.AEditor
at ..editor.A.AEditor_SimpleBeanEditorDelegate.setEditor(AEditor_SimpleBeanEditorDelegate.java:6)
    at com.google.gwt.editor.client.impl.AbstractEditorDelegate.initialize(AbstractEditorDelegate.java:200)
    at com.google.gwt.editor.client.impl.AbstractEditorDelegate.addSubDelegate(AbstractEditorDelegate.java:156)
    at com.google.gwt.editor.client.impl.AbstractEditorDelegate$Chain.attach(AbstractEditorDelegate.java:78)
    at com.google.gwt.editor.client.adapters.ListEditorWrapper.attach(ListEditorWrapper.java:95)
    at com.google.gwt.editor.client.adapters.ListEditor.setValue(ListEditor.java:164)
    at com.google.gwt.editor.client.adapters.ListEditor.setValue(ListEditor.java:1)
    at com.google.gwt.editor.client.impl.Refresher.visit(Refresher.java:40)
    at com.google.gwt.editor.client.impl.Initializer.visit(Initializer.java:49)
    at com.google.gwt.editor.client.impl.AbstractEditorContext.traverse(AbstractEditorContext.java:128)
    at com.google.gwt.editor.client.impl.AbstractEditorDelegate$Chain.traverse(AbstractEditorDelegate.java:100)
    at com.google.gwt.editor.client.impl.AbstractEditorDelegate$Chain.attach(AbstractEditorDelegate.java:83)
    at com.google.gwt.editor.client.adapters.OptionalFieldEditor.setValue(OptionalFieldEditor.java:113)
    at com.google.gwt.editor.client.impl.Refresher.visit(Refresher.java:40)
    at com.google.gwt.editor.client.impl.Initializer.visit(Initializer.java:49)
    at com.google.gwt.editor.client.impl.AbstractEditorContext.traverse(AbstractEditorContext.java:128)

I debugged into it and it seemed to be related to AbstractEditorDelegate.java:
http://code.google.com/p/google-web-toolkit/source/browse/releases/2.4/user/src/com/google/gwt/editor/client/impl/AbstractEditorDelegate.java?r=10474
in line 75, for NullableBListEditor , the type returned by createComposedDelegate()is the same as that of NullableAListEditor(editor_A_AEditor_SimpleBeanEditorDelegate). As a result, the
subDelegate type is not correct for B and caused the above errors during attaching. (If I create B then A, B will work but A will fail for similar errors)

I couldn't figure out why. Anyone knows how to fix it?

Thanks a lot,

-Jeff

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