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org.apache.openjpa.persistence.PersistenceException: null at org.apache.openjpa.jdbc.kernel.AbstractJDBCSeq.getConnection(AbstractJDBCSeq.java:162) at org.apache.openjpa.jdbc.kernel.TableJDBCSeq.allocateSequence(TableJDBCSeq.java:366) at org.apache.openjpa.jdbc.kernel.TableJDBCSeq.nextInternal(TableJDBCSeq.java:266) at org.apache.openjpa.jdbc.kernel.AbstractJDBCSeq.next(AbstractJDBCSeq.java:60)