问Hibernate 4默认事务超时值

EN

2014-11-14 17:39:44 [WARN]SqlExceptionHelper:143    SQL Error: 0, SQLState: 08S01
2014-11-14 17:39:44 [ERROR]SqlExceptionHelper:144   Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
2014-11-14 17:39:44 [ERROR]BackupService:245    org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Could not open connection

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan">
            <list>
                <value>com.test.db.entity</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>
                <prop key="hibernate.show_sql">false</prop>             
                <prop key="hibernate.bytecode.use_reflection_optimizer">false</prop>
                <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.search.autoregister_listeners">false</prop>
                <prop key="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</prop>         
            </props>
        </property>
</bean>