title: Ant giving _JAVA OPTIONS message
body: <p>I have installed Apache Ant 1.8 on Windows 8.1.</p>
  
  <p>When I am running the <code>ant</code> command on console, it is showing following message on screen:<br/>
  <strong><code>Picked up _JAVA_OPTIONS: -Djava.net.preferIPv4Stack=true</code></strong></p>
  
  <p>I am not able to find the reason of this message.</p>
  
  <p>Attaching screen shot for your reference.
  <img src="https://i.stack.imgur.com/8jg4o.gif" alt="enter image description here"></p>
  
  <p>Please provide me your comments on this. Also will it impact on the working of <code>ant</code>?</p>
  
  <p><strong>Please ignore the error about <code>build.xml</code> and '<code>tools.jar</code>.</strong></p>