在Spring+hebernate中 Cannot get a connection, pool error Timeout waiting for idle object異常的解決辦法
最近寫了個留言板,tomcat+Spring+hibernate+MyEclipse
使用jdbc連接數據庫所有功能都沒問題,發佈到tomcat中也沒問題,可是如果使用tomcat的數據源,來連接數據庫,開始很正常,但是刷新幾次就會出現這個異常……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 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
at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection (LocalDataSourceConnectionProvider.java:81)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:417)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:105)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1561)
at org.hibernate.loader.Loader.doQuery(Loader.java:661)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2145)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
at org.hibernate.loader.Loader.list(Loader.java:2024)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:308)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:153)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1106)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at org.springframework.orm.hibernate3.HibernateTemplate$29.doInHibernate(HibernateTemplate.java:849)
at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:372)
at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:840)
at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:832)
……………………
開始弄了半天也不知道怎麼回事,後來發現是我自己寫的分頁代碼有問題……原來的代碼如下:
/**
* 自定義的,用屬性模糊查詢
*
* */
public List find(String propertyName, Object value) {
log.debug("finding Message instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from Message as model where model."
+ propertyName + " like "+value+" order by model.time desc";
return getHibernateTemplate().find(queryString);
} catch (RuntimeException re) {
log.error("find by property name failed", re);
throw re;
}
}
/**
*
* 自定義的方法,獲取指定頁的數據
*
* */
public List gotoPage(int page,int pageSize){
int totItem = this.findAll().size();//記錄總條數
int pageNum = totItem / pageSize +1;//總頁數
int begin = 0;//當前起始記錄數
begin=page*pageSize-pageSize+1; //計算當前起始位置
Session s =this.getSession();
String hql = "from Message message order by message.time desc";
Query q =s.createQuery(hql);
q.setFirstResult(begin);
q.setMaxResults(pageSize);
return q.list();
}
在這句中: Session s =this.getSession();
String hql = "from Message message order by message.time desc";
Query q =s.createQuery(hql);
查詢數據時,Spring並不能夠自動管理連接,也就是說,在使用中這幾句代碼重視不段的獲取數據庫的連接,每調用一次就申請一個連接……直到 tomcat連接池中的連接耗盡……所以就再也申請不到連接了……出現了這個異常,解決辦法是使用事務來管理這段代碼,讓Spring自動管理這段代碼中申請的連接。我使用了Spring AOP自動事務代理……配置文件如下……
<!-- 來自JNDI的tomcat數據源,有連接池。但是用起來怎麼就釋放不了連接呢?程序只知道申請,不知道釋放! -->
<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的會話工廠 -->
<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>
<!-- 顯示SQL,爲了方便測試 -->
<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>
<!-- 事務管理器 -->
<bean id="transactionManger"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<!-- 配置事務攔截器-->
<bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
<property name="transactionManager">
<ref bean="transactionManger" />
</property>
<!-- 下面定義事務傳播屬性-->
<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>
</props>
</property>
</bean>
<!-- 自動代理 -->
<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>
<!-- 這裏的配置是必須的,否則無法完成代理的類型轉化
這是使用CGLIB來生成代理
-->
<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>
OK,問題成功解決!
ssh 不能釋放tomcat數據庫連接池中的連接
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