When using java to receive a Multicast address I get a failed exception.

I am trying to receive multicast data in Matlab, but am using Java code because Matlab is unable to receive Multicast data. I am using the following code but when trying to join the group I get an exception.

    import java.io.*;
    import java.io.DatagramSocket;
    import java.io.DatagramPacket;
    import java.io.InetAddress;
    import java.io.MulticastSocket;

    addr = InetAddress.getByName(‘235.1.1.1’);

    socket = MulticastSocket(8100);
    socket.setSoTimeout(5000);
    socket.setReuseAddress(1);
    socket.joinGroup(addr);

When I try to join the group I get the following exception.

Java exception occurred: java.net.SocketException: No such device at java.net.PlainDatagramSocketImpl.join(Native Method) at java.net.AbstractPlainDatagramSocketImpl.join(Unknown Source) at java.net.MulticastSocket.joinGroup(Unknown Source)

This code has been pulled from other sources on the web so I feel like something is configured correctly. When I run java –version in Matlab I get Java 1.7.0_60-b19.

I was unable to copy and paste the code, but I think I typed it in correctly so if there is a syntax error that may be why.

This code is run on Red Hat 7.3 and Matlab 2016a.