Spring + Quartz = 内存泄漏

Question

我使用以下库。

quartz -2.2.1

spring-webmvc-3.2.9.RELEASE

在 Apache Tomcat/7.0.52 (Ubuntu) 上。

我使用 Spring 来配置 Quartz。

@Configuration
class QuartzConfig {
    @Bean
    FactoryBean<Scheduler> scheduler() {
        final SchedulerFactoryBean factory = new SchedulerFactoryBeanWithShutdownDelay();
        final Map<String, Object> map = new LinkedHashMap<>();
        map.put("settingsService", settingsService);
        final List<AbstractQuartzJob> jobs = new LinkedList<>();
        jobs.add(dbBackupJob());
        jobs.add(csvExportJob());
        jobs.add(csvImportJob());
        jobs.add(dbMaintenanceJob());
        jobs.add(filesystemCleanupJob());
        map.put("jobs", jobs);
        factory.setSchedulerContextAsMap(map);
        factory.setTriggers(new Trigger[] {cronTrigger});
        return factory;
    }
}

今天搜索了很多为什么调度程序任务没有正确关闭......

Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-1] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-2] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-3] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-4] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-5] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-6] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-7] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-8] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-9] but has failed to stop it. This is very likely to create a memory leak.
Jun 24, 2014 5:14:38 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/feeder##1.5.0] appears to have started a thread named [scheduler_Worker-10] but has failed to stop it. This is very likely to create a memory leak.

丑陋的黑客是编写 SchedulerFactoryBeanWithShutdownDelay 类。

public class SchedulerFactoryBeanWithShutdownDelay extends SchedulerFactoryBean {
    private static final int SHUTDOWN_TIMEOUT = 2000;

    @Override
    public void destroy() throws SchedulerException {
        log.debug("Start shutdown of Quartz scheduler factory bean");
        super.destroy();
        try {
            log.debug("wait {}ms to shutdown Quartz", SHUTDOWN_TIMEOUT);
            Thread.sleep(SHUTDOWN_TIMEOUT);
            log.debug("Quartz scheduler shutdown completed");
        } catch (InterruptedException e) {
            log.error("", e);
        }
    }
}

但是这个问题应该已经关闭了: https://jira.terracotta.org/jira/browse/QTZ-192

我犯了错误还是可以确认？

Answer 1

安 excellent article关于 Tomcat 中的内存泄漏。阅读这篇文章，启动您的 Web 应用程序，让 Quartz 作业执行，然后停止 Web 应用程序，然后获取 Tomcat JVM 的堆转储，将堆转储加载到 Eclipse MAT 中并找出哪些类导致内存泄漏。那么你应该能够解决这个问题。