mysql - 我的 spring+hibernate 应用程序没有关闭 jdbc 连接

Question

我在生产环境中有一个 Spring+Hibernate+Tomcat+MySql 应用程序，我遇到了一个问题。我认为应用程序没有关闭它的 jdbc 连接，当它达到其限制(当前为 200)时，应用程序停止响应，我必须重新启动 tomcat。我需要在某处关闭此连接吗？这是我的数据源:

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/" override="true" reloadable="false" swallowOutput="false">
    <!-- jdbcInterceptors, removeAbandoned, removeAbandonedTimeout van juntos, ver http://www.tomcatexpert.com/blog/2012/01/24/using-tomcat-7-jdbc-\
    connection-pool-production, y https://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html -->
    <!-- removeAbandonedTimeout es en segundos -->

    <Resource name="jdbc/catWDB" auth="Container" type="javax.sql.DataSource"
              driverClassName="com.mysql.jdbc.Driver"
              factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory"
              url="@URL@"
              username="@USERNAME@"
              password="@PASSWORD@"

              maxActive="200"
              maxIdle="50"
              minIdle="10"
              suspectTimeout="60"
              timeBetweenEvictionRunsMillis="30000"
              minEvictableIdleTimeMillis="60000"

              validationQuery="select 1"
              validationInterval="30000"
              testOnBorrow="true"

              removeAbandoned="true"
              removeAbandonedTimeout="60"
              abandonWhenPercentageFull="10"
              maxWait="10000"

              jdbcInterceptors="ResetAbandonedTimer;StatementFinalizer"


            />

</Context>

这是从 3 天到现在监控连接的 appdynamics 的图像

这是我在 catalina.out 日志文件中得到的错误的摘录:

type Exception report

message Request processing failed; nested exception is org.hibernate.exception.JDBCConnectionException: Cannot open connection

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.exception.JDBCConnectionException: Cannot open connection org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:932) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:816) javax.servlet.http. . . .

root cause

org.hibernate.exception.JDBCConnectionException: Cannot open connection org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99) org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52) org.hibernate.jdbc.ConnectionManager. . . .

root cause

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections sun.reflect.GeneratedConstructorAccessor67.newInstance(Unknown Source) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) java.lang.reflect.Constructor.newInstance(Constructor.java:513) com.mysql.jdbc.Util.handleNewInstance(Util.java:406) com.mysql.jdbc.Util.getInstance(Util.java:381) com.mysql.jdbc.SQLError.

更新

public Category findByIdByApp(Integer id, int appListId) throws DataAccessException {

       Criteria criteria = getSession().createCriteria(Category.class,"category")
                .createAlias("appList", "app")
                .add(Restrictions.and(Restrictions.eq("category.categoryId", id), Restrictions.eq("app.appListId", appListId)));
          List result=criteria.list();

        if(result.size()==1)

                return (Category) result.get(0);
         else
                return null;
    }

Category 域对象映射如下:

@Entity
@Table(name = "category")
public class Category implements Comparable, Serializable {

所以我的猜测是，考虑到 mithridas 的评论，我正在手动使用 hibernate session ，我需要用这样的东西关闭它们:

this.getSession().clear();

或者我可以实现@PersistenceContext。谁能指导我使用此实现，以便我评估哪种最适​​合我们使用？

谢谢。

更新 2:添加了更多信息以回答 James Massey 的评论:

这些是我的:数据源、sessionFactory、transactionManager 和 categoryDAO sessionFactory 分配:

<!-- ========================= DATA ACCESS OBJECT DEFINITIONS ======================== -->

<bean id="dataSource"
      class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName">
        <value>java:comp/env/jdbc/catWDB</value>
    </property>
</bean>


<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource">
        <ref local="dataSource"/>
    </property>
    <property name="configLocation" value="classpath:hibernate.cfg.xml" />

    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.connection.pool_size">3</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.max_fetch_depth">1</prop>

        </props>
    </property>
</bean>


<!---->
<bean id="transactionManager" lazy-init="true"
      class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory">
        <ref local="sessionFactory"/>
    </property>

</bean>



<bean id="categoryDAOTarget" class="com.bamboo.catW3.DAO.impl.CategoryDAOImpl">
    <property name="sessionFactory">
        <ref local="sessionFactory"/>
    </property>
</bean>

Answer 1

问题不在 session 中，而是在连接池中， session 在正确管理的地方，但 JDBC 层中的连接池没有关闭连接。

这些是我为修复它们所做的事情。

JDBC 上下文配置

1.- 将 JDBC 连接工厂从 tomcat 的旧 BasicDataSourceFactory 更改为 tomcat 的新 DataSourceFactory

2.- 根据本文调整了 JDBC 设置: http://www.tomcatexpert.com/blog/2010/04/01/configuring-jdbc-pool-high-concurrency

session 工厂xml配置

3.- 从 session 工厂配置中删除了这一行:

<prop key="hibernate.max_fetch_depth">1</prop>

我的配置是这样结束的:

JDBC 上下文配置

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/" override="true" reloadable="false" swallowOutput="false">
    <Resource name="jdbc/catWDB" auth="Container" type="javax.sql.DataSource"
              driverClassName="com.mysql.jdbc.Driver"
              factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
              url="@URL@"
              username="@USERNAME@"
              password="@PASSWORD@"
              maxActive="200"
              maxIdle="50"
              minIdle="10"
              suspectTimeout="60"
              timeBetweenEvictionRunsMillis="30000"
              minEvictableIdleTimeMillis="60000"
              validationQuery="select 1"
              validationInterval="30000"
              testOnBorrow="true"
              removeAbandoned="true"
              removeAbandonedTimeout="60"
              abandonWhenPercentageFull="10"
              maxWait="10000"
              jdbcInterceptors="ResetAbandonedTimer;StatementFinalizer"
            />
</Context>

session 工厂xml配置

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref local="dataSource"/>
        </property>
        <property name="configLocation" value="classpath:hibernate.cfg.xml" />
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">false</prop>
                <prop key="hibernate.max_fetch_depth">3</prop>
            </props>
        </property>
</bean>