Java: InetAddress.getLocalHost() and getHost() return fully qualified domain name (FQDN)

Issue

• System host name has been set to the short name and not the fully qualified domain name.
• java.net.InetAddress.getLocalHost().getHostname() call always returns the fully qualified domain name.
• java.net.InetAddress.getHost().getHostname() call always returns the fully qualified domain name.
• The following sample program demonstrates this:

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

public class hostnamenew {

    public static void main(String[] argv) {
        try {
            InetAddress addr = java.net.InetAddress.getLocalHost();    
            System.out.println(addr);
            String hostname = addr.getHostName();    
            System.out.println("Hostname of system = " + hostname);
        } catch (UnknownHostException e) {
            System.out.println(e);
        }
    }
}

• Java code getloclhost returns FQDN instead of hostname. After new GLIBC rpm installed on server, the java code getlocalhost is returning FQDN instead of hostname. How to diagnose and resolved it?