// Define a new Trigger
Trigger trigger = newTrigger()
.withIdentity("newTrigger", "group1")
.startNow()
.build();
// tell the scheduler to remove the old trigger with the given key, and
// put the new one in its place
sched.rescheduleJob(triggerKey("oldTrigger", "group1"), trigger);

// retrieve the trigger
Trigger oldTrigger = sched.getTrigger(triggerKey("oldTrigger", "group1");
// obtain a builder that would produce the trigger
TriggerBuilder tb = oldTrigger.getTriggerBuilder();
// update the schedule associated with the builder, and build the new trigger
// (other builder methods could be called, to change the trigger in any
// desired way)
Trigger newTrigger = tb.withSchedule(simpleSchedule()
.withIntervalInSeconds(10)
.withRepeatCount(10)
.build();
sched.rescheduleJob(oldTrigger.getKey(), newTrigger);