Spring-Hibernate应用程序:非法访问:此Web应用程序实例已经停止

Question

我正在以适当的方式处理连接.
1.我在我的应用程序中使用"Hibernate"连接池.每当我从池中获得连接时,我都会在完成交易后返回池中.
2.我已经监测数据库,检查连接.我将'空闲连接'时间设置为60秒.我发现没有连接对象运行超过60秒.

我仍然经常收到这个错误.我的Web应用程序正在停止.我必须每天重启tomcat一次.但是,我正在寻找一个永久的解决方案,而无需重新启动tomcat.
任何人都可以解释根本原因吗？所以我可以解决这个问题.

错误日志:

INFO: Illegal access: this web application instance has been stopped already.  Could not load com.mchange.v2.c3p0.ComboPooledDataSourceBeanInfo.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1587)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1546)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    ...
    ...
    ...
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:679)

我的hibernate-contect.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns="http://www.springframework.org/schema/beans" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:p="http://www.springframework.org/schema/p" 
        xmlns:tx="http://www.springframework.org/schema/tx"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="
            http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
            http://www.springframework.org/schema/tx 
            http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-3.1.xsd
            ">

    <context:property-placeholder location="/WEB-INF/spring.properties" />

    <!-- Enable annotation style of managing transactions -->
    <tx:annotation-driven transaction-manager="transactionManager" />   

    <!-- Declare the Hibernate SessionFactory for retrieving Hibernate sessions -->
    <!-- See http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/orm/hibernate3/annotation/AnnotationSessionFactoryBean.html -->                           
    <!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/SessionFactory.html -->
    <!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/Session.html -->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
                 p:dataSource-ref="dataSource"
                 p:configLocation="${hibernate.config}"
                 p:packagesToScan="com.turborep.turbotracker"/>

    <!-- Declare a datasource that has pooling capabilities-->   
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
                destroy-method="close"
                p:driverClass="${app.jdbc.driverClassName}"
                p:jdbcUrl="${app.jdbc.url}"
                p:user="${app.jdbc.username}"
                p:password="${app.jdbc.password}"
                p:acquireIncrement="5"
                p:idleConnectionTestPeriod="60"
                p:maxPoolSize="100"
                p:maxStatements="50"
                p:minPoolSize="0" />

    <!-- Declare a transaction manager-->
    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager" 
                p:sessionFactory-ref="sessionFactory" />

</beans>

编辑1:
我今天又收到了一个错误.这是日志:

[ERROR] [ajp-bio-8009-exec-4 08:27:13] (JDBCExceptionReporter.java:logExceptions:234) Connections could not be acquired from the underlying database!
[ERROR] [ajp-bio-8009-exec-4 08:27:13] (JDBCExceptionReporter.java:logExceptions:234) Connections could not be acquired from the underlying database!
[ERROR] [ajp-bio-8009-exec-4 08:27:13] (JobServiceImpl.java:getRxmasterID:4399) Cannot open connection
org.hibernate.exception.GenericJDBCException: Cannot open connection
    at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)
    ...
    ...
    ... 
    at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
    ... 50 more

示例代码我如何使用连接:

@Resource(name="sessionFactory")
private SessionFactory itsSessionFactory;

@Override
public List<Userloginclone> getAllUserList() {
    itsLogger.debug("Retrieving all user list");
    Session aSession = null;
    List<Userloginclone> aQueryList = null;
    try {
        aSession = itsSessionFactory.openSession();
        Query aQuery = aSession.createQuery("FROM  Userloginclone");
        aQueryList = aQuery.list();
    } catch (Exception e) {
        itsLogger.error(e.getMessage(), e);
    } finally {
        aSession.close();
    }
    return  aQueryList;
}

如果我做错任何事,请纠正我.

Answer 1

您遇到的问题与数据库连接无关.

我猜你在重新启动tomcat并且不重新部署应用程序时不会遇到这个问题,对吧？

它的原因是在tomcat中重新部署应用程序.每次重新部署应用程序时,都会创建Web应用程序的新实例,并停止旧的实例.可能是某个旧应用程序在以前的应用程序中加载了旧类,或者应用程序未正确取消部署.

你在tomcat/lib中有一些jar吗？你能展示一下JobQuoteFormController和JobServiceImpl类吗？

Answer 2

首先,您可能希望使用Spring的事务管理器和Hibernate的OpenSessionInViewFilter来管理Session和事务管理.有了这两个,您不必担心管理连接,可以使用itsSessionFactory.getCurrentSession()获取会话.

接下来,您应该将p:testConnectionOnCheckout ="true"添加到dataSource bean.

您的应用程序发生的事情是,一旦连接失效,它就会死机.这将允许重新启动死连接.