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).
