Derby seems too unstable in multithreaded situations to be a good database for 
ManifoldCF, so try to add support for HSQLDB
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                 Key: CONNECTORS-114
                 URL: https://issues.apache.org/jira/browse/CONNECTORS-114
             Project: ManifoldCF
          Issue Type: Bug
          Components: Framework core
            Reporter: Karl Wright


Derby seems to have multiple problems:
(1) It has internal deadlocks, which even if caught cause poor performance due 
to stalling (CONNECTORS-111);
(2) It has no support for certain SQL constructs (CONNECTORS-109 and 
CONNECTORS-110);
(3) It locks up entirely for some people (CONNECTORS-100).

HSQLDB has been recommended as another potential embedded database that might 
work better.

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