[1.9] Wall climbing

Quick question(I think.)

How can I create something to allow the player to climb up walls, like a spider would? This was from a book I had read earlier but this book was written for 1.8:

public class WallClimb {

@SubscribeEvent

public void climbWall(LivingUpdateEvent event) {

if (!(event.getEntity() instanceof EntityPlayer)) {

return;

}

if (!event.getEntity().isCollidedHorizontally) {

return;

}

event.getEntity().motionY = 0.5;

}

}