The EntityLivingJump Event is fired whenver an entity jumps.

You will need to cast the event in the function header as this class:
crafttweaker.event.EntityLivingJumpEvent
You can, of course, also import the class before and use that name then.

PlayerDeathDrops реализует следующие интерфейсы и способно вызвать все их методы/геттеры/сеттеры:

• ILivingEvent