There are different things you can do depending upon you and your opponents attributes.
A common tactic is to try and come over the top of it with a counter right to make them throw the jab less. A pull counter would work really well.
You can try catching the jab with your right glove if you're orthodox, or if you can switch hit, turn southpaw and keep you lead right hand high so it blocks the path of his jab.
If your opponent doesn't move that well, then you can leap in like Wlad did against Pulev. Pulev was out jabbing him, so instead of jabbing with him Wlad danced on the outside so Pulev's jab fell short and then jumped in with the left hook.