title: Spring Boot CRON expression is not working properly
body: <p>I have a Spring Boot application which will create a JAR file. In this application I have tow jobs to execute. One job is master job which saves data in MySQL database and second job perform some calculations and prepare some reports.</p>
  
  <p>I need to execute master job at every 15 minutes and second job every 20 minute. So I used Spring Corn expression "* */15 * * * <em>" for master job and "</em> */20 * * * *" for second job. But the behavior of job execution is very abrupt. What I am doing wrong here?</p>