I don't think this is implemented yet. I tried it yesterday myself. :)
See: http://issues.apache.org/jira/browse/JCR-322
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Hi
When I tired to change existing node using NodeTypeRegistry.reregister(). I am
getting a exception "says not implemented"
javax.jcr.RepositoryException: not yet implemented
at
org.apache.jackrabbit.core.nodetype.NodeTypeRegistry.checkForConflictingContent(NodeTypeRegistry.java:1690)