Нашел, неждан конечно.
@Listener(order = Order.FIRST, beforeModifications = true)
public void event(DropItemEvent event) {
this.logger.info("DropItemEvent for " + event.getSource().toString());
}
Вывод:
DropItemEvent for EntityPainting['Painting'/246, l='world', x=-1196,00, y=116,00, z=951,97]
DropItemEvent for EntityItemFrame['entity.ItemFrame.name'/247, l='world', x=-1198,50, y=115,50, z=951,97]
DropItemEvent for EntityMinecartEmpty['entity.MinecartRideable.name'/238, l='world', x=-1199,50, y=114,06, z=948,50]
DropItemEvent for EntityBoat['Boat'/239, l='world', x=-1201,01, y=114,00, z=949,72]