2 servers creating objects

[Mike Vallender <mi...@uk.ibm.com>]

Hello, 

If I have two servers which are both running an OpenJPA program which is
referencing the same database - what's the best way to create an object
which references other objects? E.g. - I have object A - which references
object B and C - and object A1 - which references objects B and C also. If
object A is created on server 1 - then it'll first try to create B & C. If
server 2 creates A - then it will also try to create objects B and C. 
Depending on which server starts creating objects first - B, C could be
created by either server1 or server2. 

Is there anything better than - try to select B - if not there persist it?
IS there a best way to create an object if it doesn't already exist?

Thanks

Mike

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