public void setJumps(int jumps) throws Exception {
        if (jumps < 0) {
            throw new Exception("jumps must be positive");
        }
        this.jumps = jumps;
    }
<code>setJumps</code> sets the number of jumps or peaks that will
be created during the next call to <code>load</code>.
@param jumps the number of jumps to use for next load.
@throws Exception if jumps is less than zero.
jme3-terrain/src/main/java/com/jme3/terrain/heightmap/ParticleDepositionHeightMap.java