I played Jarvan many ways. He is my main champ. Tried him full AD, full Tank, and in the end i started using Off-tank Jarvan. Looked and tried many off-tank Jarvan guides, but i didn't like any of them. All of them were more tanky than damage and without balance. I wanted a build with a high damage good attack speed good amount of health and good amount of magic resist and armor. So i started trying to create builds i tryed around 5 or 6 builds they were not bad, but i still didnt like them. then came a patch with Maw of Malmortious. I needed to try that item and on who better then on my main champ. So first i started as all builds of off-tank Jarvan go: Warmog's, Atma's. It worked out good but i still wanted to have a good amount of damage in early-game. I started buying Hexdrinker as first item and it was awesome and it still is you have magic resist and damage and you get a shield of 250 health for magic damage. Then Mercury's Threads after that Warmog's and Atma's then Bloodthirster Infinity Edge and in the end Maw of Malmortious. I liked the build from the start and only changed the sequence of buying items.

I picked runes like this because I like how they work with Jarvan. I get 78 more Health Points that can't be bad. Took Marks for damage because i need some damage boost from start to easier last hit and better harras my opponent. Took Armor and Magic Resist for Seals and Glyphs because i love those runes they are just great for any solo-top champ.

Love how they fit for Jarvan. They give me everything i need i have around 3500 health points, around 400 damage, 1.2 attack speed (not that big attack speed but it's ok for me), around 150 armor and around 130 magic resist. By the way you have 43% critical chance and 20% lifesteal(if you stack Bloodthirster to max capacity).

Personally i prefer Teleport and Flash because you're solo-top and you would need to get back to your lane A.S.A.P.
You can take Exhaust instead of Teleport or Flash.
You can also try Exhaust and Ignite.
But i think that Teleport and Flash is best for him.

My skill sequence might be weird because of maxing Dragon's Strike first instead of Demacian Standard, but i told you at the begging i wanted a build that can do good amount of damage and my attack damage runes help me deal more damage with my Dragon's Strike. After Dragon's Strike i max Golden Aegis because i need a shield and a slow so it's a really good spell. At the end i max Demacian Standard. Yes it's a great spell and i tried maxing it first with this build and i didn't like it, it works better with Dragon's Strike. And ofc you max your ult when ever you can cause its awesome.