Parsing of following XML file....
<?xml version="1.0"?>
<!DOCTYPE root [
  <!ENTITY inner "val">
  <!ELEMENT inner EMPTY>
  <!ELEMENT root (inner)>
  <!ATTLIST inner attr CDATA #REQUIRED>
]>
<root>
  <inner attr="hi"/>
</root>

with DOM02.java ( File Attatched ) This bug can always be reproduced using
JAXP build b15 17th April

Exception in thread "main" java.lang.ClassCastException: org.apache.xerces.dom.DeferredAttrImpl
        at org.apache.xerces.dom.DeferredDocumentImpl.synchronizeChildren(DeferredDocumentImpl.java:1590)
        at org.apache.xerces.dom.DeferredEntityImpl.synchronizeChildren(DeferredEntityImpl.java:179)
        at org.apache.xerces.dom.ParentNode.setReadOnly(ParentNode.java:928)
        at org.apache.xerces.dom.NamedNodeMapImpl.setReadOnly(NamedNodeMapImpl.java:395)
        at org.apache.xerces.dom.DocumentTypeImpl.setReadOnly(DocumentTypeImpl.java:347)
        at org.apache.xerces.dom.DeferredDocumentTypeImpl.synchronizeChildren(DeferredDocumentTypeImpl.java:21
        at org.apache.xerces.dom.ParentNode.getChildNodes(ParentNode.java:253)
        at DomEcho02$AdapterNode.childCount(DomEcho02.java:273)
        at DomEcho02$DomToTreeModelAdapter.isLeaf(DomEcho02.java:291)
        at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(BasicTreeUI.java:2611)
        at javax.swing.tree.AbstractLayoutCache.getNodeDimensions(AbstractLayoutCache.java:406)
        at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(VariableHeightLayoutCa
e.java:1293)
        at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1429
        at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1221
        at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:674)
        at javax.swing.tree.VariableHeightLayoutCache.setModel(VariableHeightLayoutCache.java:92)
        at javax.swing.plaf.basic.BasicTreeUI.setModel(BasicTreeUI.java:299)
        at javax.swing.plaf.basic.BasicTreeUI$PropertyChangeHandler.propertyChange(BasicTreeUI.java:2726)
        at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:161
        at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:130
        at javax.swing.JComponent.firePropertyChange(JComponent.java:3208)
        at javax.swing.JTree.setModel(JTree.java:704)
        at javax.swing.JTree.<init>(JTree.java:514)
        at DomEcho02.<init>(DomEcho02.java:92)
        at DomEcho02.makeFrame(DomEcho02.java:182)
        at DomEcho02.main(DomEcho02.java:140)