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org.hibernate.exception.GenericJDBCException: Cannot open
connection	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)	at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142)	at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85)	at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1463)	at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:60)	at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1235)	at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1168)	at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1245)	at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:63)	at com.hsl.chi.persistence.dao.jpa.DAO.beginEntityTransaction(DAO.java:1505)	at com.hsl.chi.persistence.dao.jpa.DAO.beginFirstSubOperation(DAO.java:992)	at com.hsl.chi.persistence.dao.jpa.SequenceDAO.internalResetSequence(SequenceDAO.java:568)