As jarvaniv, Jarvan’s all-in can be interrupted, but it will be hard. It’s best to try and dodge it and then turn it around.

Try to keep the Drake warded so you can see if Jarvan is taking it. Ping and communicate with your team so you can counter them and try to kill them or steal the Dragon if possible.

Beware of Jarvan's early game pressure. They’re much stronger than you and will try to make plays to get themselves and their teammates ahead.

Jarvan truly comes online when they have’ve unlocked their Ultimate and hit level 6. Beware that they will start ganking more frequently when they have it up.
 As jarvaniv, Jarvan's all-in can be interrupted, but it will be difficult. It is best to try to avoid it and then turn it around. Try to keep the Drake watched so you can see if Jarvan takes. Ping and communicate with your team so that you can counter them and try to kill them or steal the Dragon if possible. Beware of Jarvan's early play pressure. They are much stronger than you and try to make games to get themselves and their teammates before. Jarvan really comes online when they unlocked their Ultimate and hit level 6. Beware that they will start to glove more frequently when they get it.