OPENJPA-1083 Fixed a mapping tool failure caused by the inability to discover and drop multi-column foreign key constraints. Multi-column FK's were not getting dropped, but got added after clearing out the tables. Trying to add an existing FK caused an exception when using Oracle.
Changed paths:
openjpa/trunk/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/schema/ForeignKey.java