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If you deploy a Oracle -ds.xml file and name the datasource DefaultDS JBoss create the tables for you.
Except if you use a XA-Datasource, in this case it happen to me that an error raise during startup.
If you use a local-tx-datasource it will work (maybe you change to XA afterwards)
If you remove the hsqldb-ds.xml JBoss will not start without error, if your oracle is in place the errors are solved