Breakpoints in Java file not getting detected during ANT Build

I am having a code like one below.

package com.mugil.servlet2;

public class Sample
{
    static
    {
      System.out.println("Hi There");
    }


    public static void main(String[] args) 
    {
      System.out.println("Sample Output1");
      System.out.println("Sample Output2");
    }
}

I am initiating a ANT build script by the script below

<?xml version="1.0" encoding="UTF-8"?>
<project name="ANT2" default="copyTarget">
  <target name="copyTarget">
  <mkdir dir="test/classes/"/>
  <javac srcdir="src/com/mugil/servlet2/" destdir="test/classes/" includeantruntime="false"></javac>
    <java classname="com.mugil.servlet2.Sample">
    <classpath path="test/classes/"></classpath>
     </java>
   </target>
</project>

I have added debugger at first line of static block and in main block

When I do the ANT build I am unable to have control in Java Breakpoints.

Thanks for Reply.