Ramesh Devaraj wrote:
Hi

  I have custom node definition say

  [X] > nt: base
+ Y Using the above custom node definition I have create some node and saved in the database. But in the later stage I have changed the custom node definition to
 [X] > nt: base
+ Y + Z

Now how can I upgrade the node definition in the database according to new 
custom node definition?

See: http://comments.gmane.org/gmane.comp.apache.jackrabbit.devel/7805

Basically you can use NodeTypeRegistry.reregister() to change existing node 
types.

Cheers,
Christoph

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