Why integer comparison is not returning true for while loop

In the below code.

package com.gmt.multithreading;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class BearAndLadder {

    public static int GetJumpCount(int jump,int slip,int[] walls)
    {
        int totalJumps = 0;
        int numWalls = walls.length;
        for (int i=0; i< numWalls; i++) {
                int jumps = computeJumps(jump, slip, walls[i]);
                totalJumps += jumps;
        }
        return totalJumps;
    }
    private static int computeJumps(int jump, int slip, int heightWall) {
        int count = 0;
        int effectiveHeight = (jump - slip);
        while (heightWall < jump ) {
            count = count + 1;
            heightWall = (heightWall - effectiveHeight);
        }
        count = count + 1;
        return count;

    }
    public static void main(String[] args) {
        int [] walls = {6, 9 ,11, 4, 5};
        System.out.println(GetJumpCount(4, 1, walls));
    }

}

The integer comparison in while loop never return true. Clearly 6 > 4 , 9 > 4 but the code never executes the while part.