gistfile1.txt

        Connection connection = null;
        CallableStatement call = null;
        try {
            connection = dataSource.getConnection();
            call = connection.prepareCall("{? = call get_entity2 (?)}");
            call.registerOutParameter(1, Types.VARCHAR);
            call.setString(2, tableName);
            call.executeUpdate();
            return call.getString(1);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            if(call != null) {
                try {
                    call.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
            if(connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
        }