I've seen many Jarvan IV builds over time and personally tested most of them. I can stand by this build because early game, it gives you the health/mana regen to stay in the lane and farm up, and transitioning into fulfilling the 'tanky DPS' role that Jarvan IV excels at.

In my opinion, Jarvan IV is one of the best solo top laners in the game. I start out with the Regrowth Pendant and a health pot and focus mostly on creep score with my Dragon Strike and auto attacks. When I hit level 2, I begin light harassment on the enemy champion, but prioritizing last hitting creeps. If I see the other top laner is out of position, or being overly aggressive, I abuse my Flag/Dragon Strike knock up and it usually scares them off allowing you to continue farming. I tend to go back when i have enough for both Philosopher's Stone and Heart of Gold, picking up health pots along the way. With those items, you should be able to start harassing the enemy champion constantly. Once you hit level 6, the enemy champion should be dead with your Flag/Dragon Strike into Cataclysm combo, assuming you forced them to use flash earlier in the laning phase. Once the top tower is destroyed, you go back for a B.F. Sword and start roaming.

During the roaming phase, there's nothing too specific to talk about, just ward up the river and their jungle, don't overextend and protect towers when needed. My next item build after the B.F. Sword goes between The Bloodthirster or Infinity Edge in whatever order necessary, then depending on the make up of the enemy team, I'll go The Last Whisper if their tank is getting too beefy, Banshee's Veil if their ap carry is getting out of control, or Trinity Force if I feel I can get the gold needed for it before any defensive items become a 'must have'.

Pros:
Very durable DPS
Has an escape mechanic (Flag/Dragon Strike) if you overextend too much
Very good in 1on1 combat
Great for farming top solo lane

Cons:
Putting most of your survivability into DPS
Requires some getting used to since it's different than how most Jarvan IV's play

I use Flash/Ignite for the early game mostly.

Flash is a great way to get out of a bad situation caused by overextending or charging into an unwinnable fight

Ignite helps you sneak out that 'First Blood' top as the enemy champion is Flashing away.

This is a different build than most Jarvan IV's are used to. Give yourself time to transition into more of a tanky DPS Jarvan IV and I guarantee you that you will enjoy it a little more. To sum up this build, you're still pretty durable, but it relies on you being able to blow the **** outta them, before they blow the **** outta you.