Coach Stacey Jones will be concerned with some patchy defence from his team but it was nonetheless an impressive performance against the fifth ranked Roosters.
The Auckland side made a blistering start, scoring five tries in the first 33 minutes to lead 28-10.
The Roosters got back into the game - aided by some simple Warrior errors - with tries either side of halftime to cut the deficit to just ten points.
The Junior Warriors, who are competing in the finals for the seventh consecutive year, restored their comfortable advantage with three tries in quick succession.
The first of them was a spectacular effort, with winger Metia Lisati soaring through the air and planting the ball inches inside the touchline, with his body closer to the grandstand than the field.
Junior Warriors: 44
Junior Roosters: 30
Halftime: 28-14