calling java.lang.Math.log does not go through the method in debug mode in Eclipse

Question

I just started profiling an application that does some log linear interpolation, and I noticed something strange when calling Math.log and Math.exp inside each other. The behaviour can be reproduced the following way:

public class TestLogExp {
public static void main(String[] args) {
    Double thisdouble = 0d;
    thisdouble = Math.log(Math.exp(10));
    System.out.println(thisdouble);
    }
}

Now we clearly see that Math.log and Math.exp are called within this main method. However, when I put a breakpoint in both Math.exp and Math.log (which are just calls to StrictMath native statics ), the execution is only interrupted in Math.exp , not in Math.log .

Now I thought it could be that java does not debug calls within calls from static methods, but when I call Math.exp(Math.log(10)) (so the other way around), the same behaviour is observed, only stopping in exp, not in log...

Anybody able to reproduce this? Why is this happening?

EDIT: It seems like it's not debugging the Math.log function at all. Replace the line thisdouble = Math.log(Math.exp(10)); with thisdouble = Math.log(10); , and still not stopping in debug mode, although there's a breakpoint in Math.class...

Answer 1

It does go into both the methods if you try it this way:

    Double thisdouble = 0d;
    double temp = Math.exp(10);
    thisdouble = Math.log(temp);
    System.out.println(thisdouble);

I am using Netbeans v7.3