CC_CYCLOMATIC_COMPLEXITY calculation is wrong

[riverwinddk]

The result from the Cyclomatic Complexity (CC_CYCLOMATIC_COMPLEXITY) detector (CyclomaticComplexity.java) reports 6 for the following method:

int f(int i, int j) {
    int result;
    if(i % 2 == 0) {
        result = i + j;
    }
    else {
        if(j % 2 == 0) {
            result = i * j;
        }
        else {
            result = i - j;
        }
    }
    return result;
}

The result should be 3, as documented here.

It seems to be quite consistent, that the reported CC is higher than the real CC, Unfortunately my understanding of the control flow graph in Spotbugs is insufficient to suggest how to fix this.