This is a battle between an early-game diver and a scaling tank. Jarvan IV wants to snowball via aggressive invades and early ganks, while you want to reach mid-game teamfights where your CC chain is superior. Your P is the key to surviving his initial burst and armor shred.

This is a heavy-weight melee brawl. JarvanIV wants to chunk you with Q poke and burst you with his flag combo, while you want to survive his initial hit with P and win long trades with E stuns.