我正在适当地处理连接。
1. 我在我的应用程序中使用'Hibernate'连接池。每当我从池中获取连接后，我会在事务完成后将其返回到池中。
2. 我监视数据库以检查连接。我设置了'空闲连接'时间为60秒。我发现没有连接对象运行超过60秒。
1. 我在我的应用程序中使用'Hibernate'连接池。每当我从池中获取连接后，我会在事务完成后将其返回到池中。
2. 我监视数据库以检查连接。我设置了'空闲连接'时间为60秒。我发现没有连接对象运行超过60秒。
尽管如此，我经常遇到这个错误。我的Web应用程序也停止了。我不得不每天重启Tomcat一次。然而，我正在寻找一个永久的解决方案，而不需要重新启动Tomcat。
有人能解释一下根本原因吗？这样我就可以解决它。
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：
我今天又遇到了一个错误。以下是日志：
[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;
}
请纠正我如果我做错了任何事情。