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“休眠”连接池。每当我从池中获得连接时，我都会在完成事务后返回池。
2.我已经监控数据库检查连接。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。
我仍然经常收到此错误。我的网络应用程序正在停止。我必须每天重新启动一次tomcat。但是，我正在寻找一个无需重新启动 tomcat 的永久解决方案。
任何人都可以解释根本原因吗？这样我就可以解决这个问题。
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$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
我的休眠连接.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
">
<context:property-placeholder location="/WEB-INF/spring.properties" />
<!-- Enable annotation style of managing transactions -->
<tx:annotation-driven transaction-manager="transactionManager" />
<!-- Declare the Hibernate SessionFactory for retrieving Hibernate sessions -->
<!-- See http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/orm/hibernate3/annotation/AnnotationSessionFactoryBean.html -->
<!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/SessionFactory.html -->
<!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/Session.html -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
p:dataSource-ref="dataSource"
p:configLocation="${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>
Edit1：
我今天又遇到了一个错误。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
我如何使用连接的示例代码：
@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;
}
如果我做错了什么，请纠正我。