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==== Manifestation ====

The Crimson DOM implementation in (some versions of) the Sun JDK 1.4 has a bug in the implementation of <code>hasAttributeNS</code>. This bug can be seen, when ''loading or importing a model from XML Schema'', as either: 

* a null pointer exception, or
* the error message "Specify a valid XML Schema and try loading again".

==== Workaround ====

To avoid this, use the following to control the JAXP implementation: 
 '''<eclipse-install-dir>'''eclipse.exe -vmargs -Djava.endorsed.dirs='''<path-to-your-xerces-jars-folder>'''

For your convenience, here are some links to XML4J and Xerces2-J, for anyone wishing to use Eclipse 3.0M8 or later. 
* [http://alphaworks.ibm.com/tech/xml4j Download XML4J from IBM alphaWorks]
* [http://xml.apache.org/xerces2-j/download.cgi Download Xerces2-J from apache.org]

====Note====

* If you use the IBM JDK 1.4 or a 5.0 JDK instead of the SUN JDK 1.4, this workaround is '''not required'''.

* If you will '''NOT''' be loading or importing model(s) from XML Schema, or do not plan to use the XSD plugin, but intend to generate models from Rose, annotated java code, or using pre-existing ecore file(s), this workaround is also '''not required'''. EMF & SDO will work fine without Xerces.

* Please do '''NOT''' open any bugs or post comments to the newsgroup regarding the absence of Xerces in the Eclipse plugin directory or that the above workaround no longer works.


[[Category:Java]][[Category:EMF]][[Category:MDT]]

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