In this simple example (notionally checking Twitter for updates) we integrate it with Spring.

Spring Config

<bean name="checkTwitterForUpdates"
  class="org.springframework.scheduling.quartz.JobDetailBean">

       <property name="jobClass" value="test.twitterReader" />
</bean>

<bean id="cronTwitterUpdateCheckTriggerBean"
  class="org.springframework.scheduling.quartz.CronTriggerBean">

       <property name="jobDetail" ref="checkTwitterForUpdates" />
       <!-- Run every day at noon -->
       <property name="cronExpression" value="0 0 12 * * ?" />
</bean>

<bean id="scheduler"
  class="org.springframework.scheduling.quartz.SchedulerFactoryBean">

       <property name="triggers">
           <list>
               <ref bean="cronTwitterUpdateCheckTriggerBean" />
           </list>
       </property>
</bean>

You may just want to call a method on an existing object (perhaps a business object). We can use MethodInvokingJobDetailFactoryBean to do just this:

Often you just need to invoke a method on a specific object. Using the MethodInvokingJobDetailFactoryBean you can do exactly this:

<bean id="jobDetail"
  class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
    <property name="targetObject" ref="someBusinessObject"/>
    <property name="targetMethod" value="someMethod"/>
</bean>

Java

package twitter;

import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.scheduling.quartz.QuartzJobBean;

public class twitterReader extends QuartzJobBean {
    protected void executeInternal(JobExecutionContext ctx)
      throws JobExecutionException {

      // Like whatever.......
    }
}

Libraries

You can get get Quartz here

You may also need:
Simple Logging Facade for Java (SLF4J) and