Do you want to disable collision for all entities, or just a select few? Also, look here: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/entity/LivingEntity.html#setCollidable(boolean)
Oh my bad. If you're using 1.8 you'll have to use NMS then. Try overriding this method for each maybe?: https://github.com/Bukkit/mc-dev/bl...6e94244/net/minecraft/server/Entity.java#L857
