Memory leaks 内存泄漏tomcat 7

当我运行Tomcat 7时，会收到以下错误消息：

Aug 04, 2015 12:53:47 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads 
SEVERE: The web application [/sample] appears to have started a thread named [org.springframework.scheduling.quartz.SchedulerFactoryBean#5_Worker-9] but has failed to stop it. This is very likely to create a memory leak.

---

您应该在ServletContextListener中优雅地关闭quartz，如下所示：

public class AppListener implements ServletContextListener
{

@Override
public void contextDestroyed(ServletContextEvent arg0)
{
    try
    {
        WebApplicationContext context = ContextLoader.getCurrentWebApplicationContext();
        Scheduler scheduler = (Scheduler) context.getBean("quartzSchedulerFactory");
        scheduler.shutdown(true);
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

@Override
public void contextInitialized(ServletContextEvent arg0)
{
} 

您必须在web.xml中添加这些ServletContextListener。您应该将侦听器放在web.xml中的第一个位置，因为在tomcat上，侦听器在关机时以相反的顺序运行

<listener>
    <listener-class>yourpackage.AppListener</listener-class>
</listener>

yourpackage.AppListener

---

或者，您可以在带有@PreDestroy注释的方法中关闭调度程序。您应该在ServletContextListener中优雅地关闭quartz，如下所示：

public class AppListener implements ServletContextListener
{

@Override
public void contextDestroyed(ServletContextEvent arg0)
{
    try
    {
        WebApplicationContext context = ContextLoader.getCurrentWebApplicationContext();
        Scheduler scheduler = (Scheduler) context.getBean("quartzSchedulerFactory");
        scheduler.shutdown(true);
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

@Override
public void contextInitialized(ServletContextEvent arg0)
{
} 

您必须在web.xml中添加这些ServletContextListener。您应该将侦听器放在web.xml中的第一个位置，因为在tomcat上，侦听器在关机时以相反的顺序运行

<listener>
    <listener-class>yourpackage.AppListener</listener-class>
</listener>

yourpackage.AppListener

---

或者，您可以关闭带有@PreDestroy注释的方法中的调度程序，SchedulerFactoryBean至少从Spring 3.0开始就有一个标志告诉它等待作业完成。设置标志并确保在关机时调用销毁方法：

<bean id="scheduler"
        class="org.springframework.scheduling.quartz.SchedulerFactoryBean"
        destroy-method="destroy">
    <property name="waitForJobsToCompleteOnShutdown" value="true" />
    ....

....

---

请参阅：

至少从Spring 3.0开始，SchedulerFactoryBean就有一个标志告诉它等待作业完成。设置标志并确保在关机时调用销毁方法：

<bean id="scheduler"
        class="org.springframework.scheduling.quartz.SchedulerFactoryBean"
        destroy-method="destroy">
    <property name="waitForJobsToCompleteOnShutdown" value="true" />
    ....

....

见：