quartz tomcat 6, no stop thread

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+1 Q:

quartz tomcat 6, no stop thread

Hi all,

for my webapp I use Quartz. When I deploy the app all is ok. When I undeploy the app more Quartz's process don't be destroied.

Log is:

INFO: Stopping service Catalina

SEVERE: The web application [/example] 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. Jul 12, 2010 6:30:40 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

Anyone can tell me how I can force the destroy action for those threads?

Thanks,

Tommaso

+2 A:

How are you starting Quartz?

Assuming you are not using a convenient wrapper like Spring, you probably want to be using a <listener> in your application's web.xml so that Quartz can be notified of the application start and shutdown.

See QuartzInitializerListener or QuartzInitializerServlet for instance.

matt b 2010-07-12 16:47:32

Yes, my app use quartz for execute thread in a given moment of the day.

tommaso 2010-07-12 17:01:39

@tommaso I was asking how you start/invoke the Quartz scheduler to be able to execute jobs at specific times. Given that you are in a servlet environment, rather than simply starting it in your code you likely want to hook into the listener/servlet startup sequence, so you can also receive notification when the application is being shut down - so you can shut down quartz at the same time.

matt b 2010-07-12 17:52:09

I give to spring the control of quartz via org.springframework.scheduling.quartz.SchedulerFactoryBean<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean" destroy-method="destroy"> <property name="triggers"> <list> <ref bean="cronTrigger"/> </list> </property><property name="quartzProperties"> <props><prop key="org.quartz.threadPool.class">org.quartz.simpl.SimpleThreadPool</prop>...</props></property></bean>

tommaso 2010-07-13 08:06:52

And how are you initializing/starting Spring? Is it through a ContextLoaderListener? Is Spring notified when the app shuts down?

matt b 2010-07-13 11:08:09

Yes spring start via ContextLoaderListener and Spring received a notify when the app shut down.

tommaso 2010-07-13 12:51:44

The `destroy()` method of `SchedulerFactoryBean` will invoke `org.quartz.Scheduler.shutdown()` with a boolean argument for `waitForJobsToCompleteOnShutdown`. Are you by any chance setting this flag in `SchedulerFactoryBean` to true? Perhaps Tomcat does not wait long enough for jobs to complete in Quartz before shutting down anyway.

matt b 2010-07-13 13:07:44

This parameter is set to true, but after still waiting more than 2 minutes tomcat not stop.

tommaso 2010-07-13 13:23:58

Well are your jobs completing within that time frame or are they longer-running? Do you need the server shutdown to wait for the jobs to complete? Sounds like you need to choose between one or the other.

matt b 2010-07-13 16:22:32

Hi Matt,

Could you please expand a bit more? Do you mean the webapp's web.xml or tomcat6's web.xml? also the server.xml has some settings on the listeners.

Thanks for that,

MRM 2010-07-13 03:55:21

edited my answer above to answer your question

matt b 2010-07-13 11:59:00

I think you would like to put it to your web.xmlhttp://java.sun.com/developer/technicalArticles/Servlets/servletapi2.3/ there is more about listeners.

Joni 2010-07-13 17:26:37

MRM 2010-07-14 07:14:07

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quartz tomcat 6, no stop thread

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