InetAddress isReachable fails with jdk7u but passes with jdk8u.

Sample Program:

import java.net.InetAddress;

public class Test {
public static void main(String[] args) {
try {
            final InetAddress addr = InetAddress.getByName("hostname");
            final boolean isReachable = addr.isReachable(2000);
            if (!isReachable) {
                System.out.println("Not Reachable");
            } else {
                System.out.println("Reachable");
            }
} catch (Exception e) {
            e.printStackTrace();
}
}
}

Excepted: Reachable
Actual: Not Reachable