ADDITIONAL SYSTEM INFORMATION :
Windows 10, Java version "1.8.0_201"

A DESCRIPTION OF THE PROBLEM :
package com.askmeipaas.java;

public class Multiple {
    static Double multiply(Double a, Double b) {
            return a * b;
    }

    public static void main(String[] args) {
        Double a = 0.1;
        for (int ia=0; ia<200; ia++) {
            Double b = 0.1;
            for (int ib=0; ib<200; ib++) {
                //All results are correct
                System.out.printf("Multiplying %f, %f, result: %f \n",a,b,Multiple.multiply(a,b));
                ib++;
                b = b + 0.1;
            }
            a = a + 0.1;
            ia++;
        }

        System.out.println(Multiple.multiply(2.3, 5.1)); // Returns 11.729999999999999
    }
}

The multiply function in the loop is working fine while it is not returning correct precision with the value of a=2.3 and b=5.1 when tested in the last print statement.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the above program

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
11.73
ACTUAL -
11.729999999999999

---------- BEGIN SOURCE ----------
package com.askmeipaas.scalabasics;

public class Multiple {
    static Double multiply(Double a, Double b) {
            return a * b;
    }

    public static void main(String[] args) {
        Double a = 0.1;
        for (int ia=0; ia<200; ia++) {
            Double b = 0.1;
            for (int ib=0; ib<200; ib++) {
                //All results are correct
                System.out.printf("Multiplying %f, %f, result: %f \n",a,b,Multiple.multiply(a,b));
                ib++;
                b = b + 0.1;
            }
            a = a + 0.1;
            ia++;
        }

        System.out.println(Multiple.multiply(2.3, 5.1)); // Returns 11.729999999999999
    }
}

---------- END SOURCE ----------

FREQUENCY : always