java – 如何防止石英内存泄漏

发布时间：2020-12-14 05:24:07 所属栏目：Java 来源：网络整理

导读：我在我的项目中使用石英.我的Web应用程序在停止时显然导致内存泄漏,错误是： SEVERE: A web application appears to have started a TimerThread named [Timer-12] via the java.util.Timer API but has failed to stop it. To prevent a memory leak,the ti

我在我的项目中使用石英.我的Web应用程序在停止时显然导致内存泄漏,错误是：

SEVERE: A web application appears to have started a TimerThread named [Timer-12] via the java.util.Timer API but has failed to stop it. To prevent a memory leak,the timer (and hence the associated thread) has been forcibly cancelled. 
Jan 2,2013 6:55:35 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: A web application appears to have started a thread named [DefaultQuartzScheduler_Worker-1] but has failed to stop it. This is very likely to create a memory leak.

我使用了org.quartz.ee.servlet.QuartzInitializerServlet和org.quartz.ee.servlet.QuartzInitializerListener.我厂的代码是：

StdSchedulerFactory factory = (StdSchedulerFactory) context.getAttribute(QuartzInitializerListener.QUARTZ_FACTORY_KEY );

而web.xml中的石英设置是：

<servlet>
         <servlet-name>
             QuartzInitializer
         </servlet-name>
         <display-name>
             Quartz Initializer Servlet
         </display-name>
         <servlet-class>
             org.quartz.ee.servlet.QuartzInitializerServlet
         </servlet-class>
         <load-on-startup>
             1
         </load-on-startup>
         <init-param>
             <param-name>shutdown-on-unload</param-name>
             <param-value>true</param-value>
         </init-param>
         <init-param>
             <param-name>wait-on-shutdown</param-name>
             <param-value>true</param-value>
         </init-param>
         <init-param>
             <param-name>start-scheduler-on-load</param-name>
             <param-value>true</param-value>
         </init-param>
     </servlet>
     <context-param>
         <param-name>quartz:shutdown-on-unload</param-name>
         <param-value>true</param-value>
     </context-param>
     <context-param>
         <param-name>quartz:wait-on-shutdown</param-name>
         <param-value>true</param-value>
     </context-param>
     <context-param>
         <param-name>quartz:start-on-load</param-name>
         <param-value>true</param-value>
     </context-param>
     <listener>
         <listener-class>
             org.quartz.ee.servlet.QuartzInitializerListener
         </listener-class>
     </listener>

请帮我解决这个内存泄漏！

解决方法

通过实现 org.quartz.InterruptableJob,您可以正确地中断由servlet卸载触发的线程.

@DisallowConcurrentExecution
public class Job implements InterruptableJob {

    private Thread thread;

    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        thread = Thread.currentThread();
        // ... do work
    }

    @Override
    public void interrupt() throws UnableToInterruptJobException {
        thread.interrupt();
        try {
            thread.join();
        } catch (InterruptedException e) {
            throw new UnableToInterruptJobException(e);
        } finally {
            // ... do cleanup
        }
    }
}

此示例可能会导致线程变量发生竞争状况错误,如果该作业在中断之前尚未执行.根据目标应用程序的生命周期,我将最终解决方案打开.如果需要通过相同的作业实例并发执行,请增加解决方案来处理多个线程并删除@DisallowConcurrentExecution注释.

为了使这个工作,石英属性org.quartz.scheduler.interruptJobsOnShutdownWithWait必须设置为true.这可以通过为调度程序定义属性文件,或者通过使用spring框架的bean引用来完成.

示例quartz.properties文件：

org.quartz.scheduler.interruptJobsOnShutdownWithWait=true

请注意,如果调度程序配置为等待关闭,则仅调度中断,从而调用scheduler.shutdown(true).

（编辑：李大同）

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