InetAddress.getAllByName() only returns IPv4 addresses when it should return IPv6 ones as well

Issue

In Java, an InetAddress.getAllByName() call should return all IP addresses associated to a hostname. Under certain conditions even though both IPv4 and IPv6 addresses should be returned, only IPv4 addresses are resolved.

So given an /etc/hosts file like the following:

c44:b0c5:0:1101::ae9:f016   foo
10.10.240.22    foo

A java program like the following:

import java.net.InetAddress;
import java.net.UnknownHostException;

public class test {
  public static void main(String[] args) {
    try {
      InetAddress SW[] = InetAddress.getAllByName("foo"); 
      for (int i=0; i<SW.length; i++) 
        System.out.println("InetAddress.getAllByName(): " + SW[i]); 
    }
    catch (UnknownHostException e) {
      e.printStackTrace();
    }
  }
}

When launched normally with bash will return:

InetAddress.getAllByName(): foo/10.233.240.22
InetAddress.getAllByName(): foo/c44:b0c5:0:1101:0:0:ae9:f016

When launched with ksh with the pipe "|" directive it will return only IPv4 addresses:

$ ksh -c "echo y | java test"
InetAddress.getAllByName(): foo/10.233.240.22