启动/停止 Tomcat 6.0.29 时出错

Question

我在春天配置了一些调度程序。当我尝试启动我的Web应用程序时，它会抛出以下错误并停止。我的应用程序实际上并未启动。当我关闭tomcat时，我的调度程序看起来也像这样，一些石英线程没有关闭

<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean" destroy-method="destroy">
    <property name="triggers">
        <list>
           <ref bean="scheduler.localAdaptorCronTrigger"/>
        </list>
    </property>
</bean>   

<bean id="localAdaptor" class="LocalAdaptor" />

<bean id="scheduler.localFSSlaAdaptorJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <property name="targetObject" ref="Adaptor"/>
        <property name="targetMethod" value="xxxxxx"/>
</bean>

<bean id="scheduler.localAdaptorCronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
        <property name="jobDetail" ref="scheduler.localAdaptorJobDetail"/>
        <!-- run every morning at 12 AM -->
      <property name="cronExpression" value="0 0 0 * * ?"/>
    </bean>
    <bean id="scheduler.localFSSlaAdaptorSimpleTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerBean">
        <!-- see the example of method invoking job above -->
        <property name="jobDetail" ref="scheduler.localAdaptorJobDetail"/>
        <!-- runs after 10 seconds for single time...-->
        <property name="startDelay" value="1000"/>
        <!-- repeated once -->
        <property name="repeatCount" value="0"/>
        <!-- useless as the repeat count is 0, so it will run once after 10 seconds of the startup of the application.... -->
        <property name="repeatInterval" value="60000"/>
</bean>

Stacktrace ：

INFO: Closing Spring root WebApplicationContext
Mar 31, 2011 10:02:22 AM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/] registered the JBDC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Mar 31, 2011 10:02:22 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
Mar 31, 2011 10:02:22 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] but has failed to stop it. This is very likely to create a memory leak.
Mar 31, 2011 10:02:22 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/c] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] but has failed to stop it. This is very likely to create a memory leak.
Mar 31, 2011 10:02:22 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2] but has failed to stop it. This is very likely to create a memory leak.
Mar 31, 2011 10:02:22 AM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@71ee88dd]) and a value of type [org.apache.cxf.bus.CXFBusImpl] (value [org.apache.cxf.bus.CXFBusImpl@409468ca]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.

我实现了监听器：

import javax.servlet.ServletContext;
 import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletContextListener;
 import org.quartz.SchedulerException;
 import org.quartz.impl.StdSchedulerFactory;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;


 public class QuartzServletContextListener implements ServletContextListener {

     final Logger log = LoggerFactory.getLogger(QuartzServletContextListener.class);
     public static final String QUARTZ_FACTORY_KEY =
             "org.quartz.impl.StdSchedulerFactory.KEY";
     private ServletContext ctx = null;
     private StdSchedulerFactory factory = null;

     public void contextInitialized(ServletContextEvent sce) {
         ctx = sce.getServletContext();

         try {

             factory = new StdSchedulerFactory();

             // Start the scheduler now

             factory.getScheduler().start();

             log.info("Storing QuartzScheduler Factory at"
                     + QUARTZ_FACTORY_KEY);

             ctx.setAttribute(QUARTZ_FACTORY_KEY, factory);

         } catch (Exception ex) {
             log.error("Quartz failed to initialize", ex);
         }
     }

     public void contextDestroyed(ServletContextEvent sce) {
         try {

             log.info("shutting down");
             factory.getScheduler().shutdown();
             Thread.sleep(1000);
         } catch (InterruptedException ex) {
             log.error("Quartz failed to shutdown", ex);
         } catch (SchedulerException ex) {
             log.error("Quartz failed to shutdown", ex);
         }
     }
 }

并在 web.xml 中添加了

<listener>
        <listener-class>xx.yy.QuartzServletContextListener</listener-class>
    </listener>

当我尝试使用 shutdown.sh 时，我可以看到仍然有一些线程处于活动状态并且 tomcat java 进程处于活动状态。

还要提一下，我有一些 3 到 4 个调度程序来处理上面在应用程序上下文中提到的不同工作。

Answer 1

至于 Tomcat 报告的任何 Quartz 相关资源，这是因为当 Quartz 需要几毫秒以上的时间来关闭其资源时，Tomcat 过于急于寻找未释放的资源。

请参阅此处的讨论（以及简单的解决方法）：

http://forums。 terracotta.org/forums/posts/list/3479.page

Answer 2

这不是问题。 Tomcat 会自动删除不需要的线程和线程局部变量，但只是告诉您您的代码或库正在做一些“有风险”的事情。

您可能想要向相应的库（c3p0 和 CXF）报告问题，它们应该在关闭时进行清理。

Answer 3

确保线程终止的唯一方法是中断并加入它们。

这可以通过实现 org.quartz.InterruptableJob 来完成，如问题 如何防止quartz 中的内存泄漏[?]。