As with a trigger meant to fire every two days, CronTrigger won't work for this schedule. For more details, see Trigger That Fires Every 2 Days. We'll need to use a SimpleTrigger:
SimpleTrigger That Executes Every Two Weeks
/*
* Note that this will create a trigger that starts immediately.
* To control the start time, use trigger.setStartTime(Date)
*/
SimpleTrigger trigger = new SimpleTrigger("trigger1", "group1");
trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
// 7(days per week) * 24(hours per day) * 60(minutes per hour) * 60(seconds per minute) * 1000(milliseconds per second)
trigger.setRepeatInterval(2L * 7L * 24L * 60L * 60L * 1000L);
