I have following code:
    Map<String, Double> finalAmountMap = new HashMap<String, Double>();
    Double test = 0d;
    finalAmountMap.put("chargeAmount",(-1*test));
    System.out.println(finalAmountMap);
Output : {1=-0.0}
If anything is multiplied with zero results in zero, but java Double multiplication of -1 with 0  is resulting in  -0.0.
Details : Java version : 1.7.0_21 , Windows 32 bits
Due to this behavior northbound system rejecting values as -0.0 is not correct mathematical term.
Is it Java bug?