Jarvan Jungle..... been done before right?
Well yes it has but I see him built tank most of the time well here is my version and in a way Jarvan makes a very deadly ganker early game and has a large variety of builds.
Now before reading on I am currently in the process of finishing this guide and it is also my first guide.
I am a fairly new player to join the many other's at the league of legends but I believe myself to be a fast learner and this my friends is my guide about how to carry from jungle as Jarvan.

SPACESPACE

Pros Good mobility Fast clearing times Can solo dragon early High Sustain Brilliant Ganks Has quite a bit of crowd control and gap closers

SPACESPACE

Cons Ult can get you and teammates killed if timed wrong or used recklessly Can get burst down quite quickly early-mid game Does fall off if cant farm Somewhat dependant on blue buff

Now for masteries I have a simple jungle page set up like so....

Now this is my recommended rune page
3 x Armor Penetration Quints
9 x Armor Penetration Marks
9 x Armor Seals
9 x Magic Resist Glyphs
I use armor penetration over flat AD runes because building AD in game is a lot easier than building armor penetration, and I believe them to be more effective.
The Magic Resist and Armor is to make him a bit more tanky early game.
If you prefer to have flat AD runes instead of Armor Penetration that's fine but I still suggest to take the Seals and Glyphs above.