title: Same quartz job running twice because of two server instances
body: <p>I have this problem: my app has a quartz scheduler to run a task each X minutes. This app is deployed in two server instances, so each instance is executing the task at the same time. I want to execute only one task at the same time. </p>
  
  <p>We have configured Quartz with Spring and our application server is WAS.</p>
  
  <p>Which options do you suggest?</p>