did you leave the seed sunk in the water?
i think they need oxygen to germinate so if they sank in the cup of water they would be starved of oxygen. maybe thats why it didnt work
i always opt for the paper towel method from the start its always worked for me
i just place the seeds on a damp papertowel an put another paper towel over it place that in a ziplock bag and leave it somewhere warm. they normaly crack within about 30-40 hours