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- org.apache.openjpa.persistence.ArgumentException: Attempt to assign id "0"
to new instance "my.package.A-0" failed; there is already an object in the
L1 cache with this id. You must delete this object (in a previous
transaction or the current one) before reusing its id. This error can also
occur when a horizontally or vertically mapped classes uses auto-increment
application identity and does not use a hierarchy of application identity