Caching primitive array types consumes excessive memory

                 Key: OPENJPA-71
             Project: OpenJPA
          Issue Type: Bug
          Components: datacache
            Reporter: Roger Keays

As reported on the mailing list: , 
in org.apache.openjpa.AbstractPCData#toData() an ArrayList is used to cache all 
types of arrays, including arrays of primitives. This can use excessively large 
amounts of memory because of the wrappers required for each element in the 
array. In one test case, a 7MB byte[] consumed 127MB when converted to a cached 

AbstractPCData needs to be fixed to handle simple arrays.

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