I've seen all builds for Jarvan IV, but all seem so incomplete in my point of view, especially in the late game, where Jarvan is so focused. I had the need of a Jarvan who was a fixed morale support for my team, and this with this build I created that.

The best build I've managed so far is Armour Penetration/Armour/Magic Resist runes... Balanced for the 2 rune page Build and low IP, sorry if it is for noob/unskilled but after various buys I still prefer this.

I've tried to create a Build that Jarvan could do damage and still very durable in fight. To do this I started a build for health and mana/health regen and boosting my gold to +2.1/10sec, the Heal and Clarity really give me more time in lane so I can buy the next items faster. After Banshees I usually take a sec to see my opponents and my team status in the game. If it has been a no-trobule game, I invest in a wriggle's lantern, which mean I can go between lanes and game phases doing jungler's stuff to make even more money.
At final phase I trade my gold generation for Warmogs Armor and Atmas Impaler. the cherry on top of the cake is the Starks fervor. It gives a real Boost to all of your team, plus your Standard.