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    <p>You would use spring-batch if you wanted to process all report requests at the same time, perhaps at night when your servers are not otherwise occupied processing real-time user requests (or even during the day during slow periods).</p> <p>You would use a quartz job if you wanted to check for new jobs every few seconds/minutes/hours/etc, and process one/many of them at that specified time interval.</p> <p>So, quartz is a scheduler and batch is a process. You could use quartz to schedule batch jobs to run at specific times. They aren't competing technologies, they are complimentary.</p> <p><strong>About your question:</strong> Given that you talk about queues and their persistence however it sounds a lot like your problem would fit into a simple jms model. You would need some messaging software. If you want to make it easy on yourself I'd recommend using <a href="http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/jms.html" rel="nofollow">spring-jms</a> as a wrapper around the basic Java EE JMS api -- the spring wrappers are simply simpler than basic jms. For a messaging service I'd look at <a href="http://www.rabbitmq.com/" rel="nofollow">RabbitMQ</a>, because again it's pretty simple.</p> <p>With the jms architecture you'd post user requests to the queue, which you'd configured to be persistent. You'd have a custom listener on the queue, passing requests to a report generator whenever it runs. You can assign one or more threads to the listener, meaning that you should find it easy to tune the performance of the report generator.</p> <p>There is a pretty useful <a href="http://java.dzone.com/articles/bridging-between-jms-and" rel="nofollow">DZone article</a> about using rabbitmq via <a href="http://www.springsource.org/spring-integration" rel="nofollow">spring-integration</a> (a set of prebuilt pattern implementations that help with connecting things to each other).</p>
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