org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool er

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2008-04-26 22:35:40,812 ERROR [org.hibernate.util.JDBCExceptionReporter] - Cannot get a connection, pool error Timeout waiting for idle object
2008-04-26 22:35:40,812 WARN [org.hibernate.util.JDBCExceptionReporter] - SQL Error: 0, SQLState: null
2008-04-26 22:35:40,812 ERROR [org.hibernate.util.JDBCExceptionReporter] - Cannot get a connection, pool error Timeout waiting for idle object
2008-04-26 22:35:40,812 ERROR [com.dao.MessageDAO] - find all failed
org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Cannot get a connection, pool error Timeout waiting for idle object; nested exception is org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object
Caused by:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object
　　查询数据时，Spring并不能够自动管理连接，也就是说，在使用中这几句代码重视不段的获取数据库的连接，每调用一次就申请一个连接……直到 tomcat连接池中的连接耗尽……所以就再也申请不到连接了……出现了这个异常，解决办法是使用事务来管理这段代码，让Spring自动管理这段代码中 申请的连接。我使用了Spring AOP自动事务代理……配置文件如下……

<!-- 来自JNDI的tomcat数据源,有连接池。但是用起来怎么就释放不了连接呢？程序只知道申请，不知道释放！ -->
<bean id="JndiDataSource"
class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName">
<value>ｊａｖａ:comp/env/SqlServer</value>
</property>
<property name="resourceRef">
<value>true</value>
</property>
</bean>
<!-- hibernate的会话工厂 -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="JndiDataSource"></ref>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.SQLServerDialect
</prop>
<!-- 显示SQL，为了方便测试 -->
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="mappingResources">
<list><!-- 映射文件 -->
<value>./Message.hbm.xml</value>
<value>./Setting.hbm.xml</value>
<value>./Admin.hbm.xml</value>
</list>
</property>
</bean>
<!-- 事务管理器 -->
<bean id="transactionManger"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<!--   配置事务拦截器-->
<bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
<property name="transactionManager">
<ref bean="transactionManger" />
</property>
<!--   下面定义事务传播属性-->
<property name="transactionAttributes">
<props>
<prop key="find*">PROPAGATION_REQUIRED</prop>
<prop key="delete*">PROPAGATION_REQUIRED</prop>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="merge*">PROPAGATION_REQUIRED</prop>
<prop key="attach*">PROPAGATION_REQUIRED</prop>               
<prop key="gotoPage">PROPAGATION_REQUIRED</prop>
<!--这里配置的事务管理相当重要, 在数据层所有的方法必须按照上面的格式进行编写-->
</props>
</property>
</bean>
<!--  自动代理 -->
<bean id="autoBeanNameProxyCreator"
class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<property name="beanNames">
<list>
<value>*DAO</value>              
<value>gotoPage</value>
<value>find</value>
</list>
</property>
<property name="interceptorNames">
<list>
<idref local="transactionInterceptor" />
</list>
</property>

<!--  这里的配置是必须的，否则无法完成代理的类型转化
这是使用CGLIB来生成代理
-->
<property name="proxyTargetClass" value="true"/>
</bean>
<bean id="MessageDAO" class="com.dao.MessageDAO">
<property name="sessionFactory">
<ref bean="sessionFactory"></ref>
</property>
</bean>
<bean id="SettingDAO" class="com.dao.SettingDAO">
<property name="sessionFactory">
<ref bean="sessionFactory"></ref>
</property>
</bean>
<bean id="AdminDAO" class="com.dao.AdminDAO">
<property name="sessionFactory">
<ref bean="sessionFactory"></ref>
</property>
</bean>
</beans>
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