Question

I have tritten below code in which I am running two jobs. First with the interval of 10 seconds and the other with the interval of 3 seconds. But ultimately at some point they will execute at the same time. Is there any mechanism to avoid this situation

    JobDetail jDetail = new JobDetail("Job1", "group1", MyJob.class);
    CronTrigger crTrigger = new CronTrigger("cronTrigger", "group1", "0/10 * * * * ?");
    sche.scheduleJob(jDetail, crTrigger);

    jDetail = new JobDetail("Job2","group2",MyJob2.class);
    crTrigger = new CronTrigger("cronTrigger2","group2","0/3 * * * * ?");
    sche.scheduleJob(jDetail, crTrigger);

Answer 1

You could create a helper object to make the two jobs synchronized:

//In the base class 
public static Object lock = new Object();

//In the first class
public void execute() {
    synchronized(lock) {
        //do stuff
    }
}

//In the second class
public void execute() {
    synchronized(lock) {
        //do stuff
    }
}

Read more about synchronization at:
http://docs.oracle.com/javase/tutorial/essential/concurrency/locksync.html