I am using JDK1.0.2 on Solaris 2.5.1 on sun4m and get a SEGV when trying
to use a multicastSocket

First of all I get a SocketException when trying to call joinGroup()

I can't figure out why this happens ..

Then if I ignore the exception and press on Java SEGVs.
I know that you shouldn't ignore the Exception, but
1) Java shouldn't SEGV !!
2) Customer appears to get the SEGV without an Exception.

I believe that the sun.net stuff is not a public interface, but I think its
still supposed to work.

Here is what is printed and further down is the sample program

java MulticastServer multicast-test
multicast-test/224.0.0.99
1
SIGSEGV 11* segmentation violation
    si_signo [11]: SIGSEGV 11* segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_ACCERR [addr: 0x0]

        stackbase=EFFFF03C, stackpointer=EFFFED20

Full thread dump:
    "Finalizer thread" (TID:0xee3003b0, sys_thread_t:0xef460de0) prio=1
    "Async Garbage Collector" (TID:0xee300368, sys_thread_t:0xef490de0) prio=1
    "Idle thread" (TID:0xee300320, sys_thread_t:0xef4c0de0) prio=0
    "clock handler" (TID:0xee3001f8, sys_thread_t:0xef4f0de0) prio=11
    "main" (TID:0xee3000a0, sys_thread_t:0x76e80) prio=5 *current thread*
        java.net.DatagramSocket.send(DatagramSocket.java:84)
        sun.net.MulticastSocket.send(MulticastSocket.java:96)
        MulticastServer.main(MulticastServer.java:63)
Monitor Cache Dump:
    sun.net.MulticastSocket@EE300DC8/EE337880 (key=0xee300dc8): monitor owner: "main"
Registered Monitor Dump:
    Finalize me queue lock: unowned
    Thread queue lock: unowned
    Class lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: unowned
    Alarm monitor: unowned
        Waiting to be notified:
            "clock handler"
    Sbrk lock: unowned
    Monitor cache lock: unowned
    Monitor registry: monitor owner: "main"
Thread Alarm Q:
Abort




import java.net.*;
import java.io.*;
import sun.net.MulticastSocket;


public class MulticastServer {

  protected static int defaultPort = 19;
  public static String characters =

"!\\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefgh"
+ "\\r\\n"
    +
"\\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghi"
+ "\\r\\n"
    +
"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghij"
+ "\\r\\n"
    +
"$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghijk"
+ "\\r\\n"
    +
"%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghijkl"
+ "\\r\\n"
    +
"&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghijklm"
+ "\\r\\n";
  static byte[] data = new byte[characters.length()];

  public static void main(String[] args) {

    MulticastSocket ms=null;
    InetAddress ia = null;
    DatagramPacket dp = new DatagramPacket(data, data.length);

    // read the address from the command line
    try {
      ia = InetAddress.getByName(args[0]);
      System.out.println(ia.toString());
     }
    catch (Exception e) {
      System.err.println(e);
      System.err.println("Usage: java MulticastServer MulticastAddress");
      System.exit(1);
    }

    try {
      ms = new MulticastSocket();
    } catch (SocketException se) {
      System.out.println("Couldn't create socket");
      System.err.println(se);
    }
    try {
      ms.joinGroup(ia);
    }
    catch (SocketException se) {
      System.out.println("Couldn't join");
      System.err.println(se);
    }
    try {
      for (int i = 1; i < 10; i++) {
        System.out.println(i);
        ms.send(dp, (byte) 1);
        System.out.println("sent");
      }
    }
    catch (SocketException se) {
      System.out.println("Couldn't send on socket");
      System.err.println(se);
    }
    catch (IOException ie) {
      System.out.println("Couldn't write on socket");
      System.err.println(ie);
    }
    
      ms.close();
    

  }

}