from Stack Overlow:

// creates random BigDecimal \in [1,100]
 private BigDecimal randBD() {
        BigDecimal max = new BigDecimal(100d);
        BigDecimal min = new BigDecimal(1d);
        BigDecimal range = max.subtract(min);
        BigDecimal result = min .add(range.multiply(new BigDecimal(Math.random()))); 
        return result;
 }