Comments on: Java + Cron Job = Quartz

By: Scott Selikoff

Scott Selikoff — Sun, 20 Feb 2011 20:33:48 +0000

I have not seen CPU usage like that before for Quartz. There are a number of configuration parameters you can provide to Quartz that will reduce its usage though. Check the documentation. Also, how often is the item your are scheduling firing? Is it possible its firing continuously?

By: C Mong

C Mong — Sun, 20 Feb 2011 10:55:15 +0000

I have Quartz embedded in my application, but it makes the CPU run very hot. As soon as I start the instance of Quartz temperature increases by 20C. Is there some option to make CPU run cooler?

By: Scott Selikoff

Scott Selikoff — Sat, 21 Nov 2009 03:07:41 +0000

How does embedding Quartz lead to downtimes? Just curious how that situation arises.

By: Ian Lim

Ian Lim — Sun, 08 Nov 2009 13:28:47 +0000

In some situation, embedding Quartz within the Application Servers are quite useful. I got situations where using Quartz by embedding within the Application Server become quite a hindrance, since the customers don’t like downtimes on the Application Server.

By: mkyong

mkyong — Sat, 07 Nov 2009 09:46:43 +0000

I’m using Quartz and implemented in few production system , proven Java schedule solution, it will be more powerful when integrate with Spring .

One of the drawback is the thread is a bit hard to kill , when i restart Tomcat or other webApp, Quartz’s thread seem is still running and log some error, often time i have to issue the kill -9 command. Not sure it’s server issue or Quartz ? Do you face the similar problem before?

By: Scott Selikoff

Scott Selikoff — Thu, 05 Nov 2009 18:55:12 +0000

True, but if your app server isn’t running you’ve got other issues. For example, how would a cron job start and connect to your server if there is no server to connect to? Issues such as server failure should be handled by proper server monitoring and reporting. It’s a mixed issue to say you shouldn’t put a cron job on a server because your worried it will go down.

I’m not in favor of moving single process Cron jobs into a J2EE application server, unless it was connecting to that application server to begin with.

By: Brian Gilstrap

Brian Gilstrap — Thu, 05 Nov 2009 18:10:15 +0000

While cron jobs may break if your Java home changes, Quartz breaks if the app server isn’t running. So ‘batch jobs’ seem like a reasonable use for Quartz, but heartbeat, monitoring, and restart tasks need to run separate from the app server. So I think there is still a place for cron jobs that run a Java program.