<jdbc.driver>com.mysql.jdbc.ReplicationDriver</jdbc.driver>
                <jdbc.url>jdbc:mysql:replication://db1db_front,db2db_front</jdbc.url>
                <jdbc.username>****</jdbc.username>
                <jdbc.password****</jdbc.password>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" p:driverClass="${jdbc.driver}" p:jdbcUrl="${jdbc.url}" destroy-method="close">
        <property name="properties">
            <props>
                <prop key="c3p0.acquire_increment">5</prop>
                <prop key="c3p0.idle_test_period">2000</prop>
                <prop key="c3p0.timeout">5000</prop>
                <prop key="c3p0.max_size">500</prop>
                <prop key="c3p0.max_statements">0</prop>
                <prop key="c3p0.min_size">10</prop>
                <prop key="user">${jdbc.username}</prop>
                <prop key="password">${jdbc.password}</prop>
            </props>
        </property>
    </bean>

@Transactional(readOnly = true, propagation=Propagation.REQUIRED)