org.hibernate.exception.GenericJDBCException: Cannot open connection*

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Cannot open connection
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org.hibernate.exception.GenericJDBCException: Cannot open connection*
at org.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(
at org.hibernate.exception.ErrorCodeConverter.convert(
at org.hibernate.exception.JDBCExceptionHelper.convert(
at org.hibernate.exception.JDBCExceptionHelper.convert(
at org.hibernate.jdbc.ConnectionManager.openConnection(
at org.hibernate.jdbc.ConnectionManager.getConnection(
at org.hibernate.jdbc.JDBCContext.connection(
at org.hibernate.transaction.JDBCTransaction.begin(
at org.hibernate.transaction.JDBCTransactionFactory.beginTransaction(

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