Program: 41779
Project: 41779
Buggy source:
@Override public void start() throws IOException, IllegalStateException {
  if (listener == null) {
    throw new IllegalStateException("String_Node_Str");
  }
  if (started.compareAndSet(false,true)) {
    if (group == null || group.length() == 0) {
      throw new IOException("String_Node_Str");
    }
    if (discoveryURI == null) {
      try {
        discoveryURI=new URI(DEFAULT_DISCOVERY_URI_STRING);
      }
 catch (      URISyntaxException e) {
      }
    }
    LOG.trace("String_Node_Str",discoveryURI);
    String myHost=discoveryURI.getHost();
    int myPort=discoveryURI.getPort();
    if (DEFAULT_HOST_STR.equals(myHost)) {
      myHost=DEFAULT_HOST_IP;
    }
    if (myPort < 0) {
      myPort=DEFAULT_PORT;
    }
    LOG.trace("String_Node_Str",myHost);
    LOG.trace("String_Node_Str",myPort);
    LOG.trace("String_Node_Str",group);
    LOG.trace("String_Node_Str",mcInterface);
    LOG.trace("String_Node_Str",mcNetworkInterface);
    LOG.trace("String_Node_Str",mcJoinNetworkInterface);
    this.inetAddress=InetAddress.getByName(myHost);
    this.sockAddress=new InetSocketAddress(this.inetAddress,myPort);
    mcast=new MulticastSocket(myPort);
    mcast.setLoopbackMode(loopBackMode);
    mcast.setTimeToLive(getTimeToLive());
    if (mcJoinNetworkInterface != null) {
      mcast.joinGroup(sockAddress,NetworkInterface.getByName(mcJoinNetworkInterface));
    }
 else {
      mcast.joinGroup(inetAddress);
    }
    mcast.setSoTimeout((int)keepAliveInterval);
    if (mcInterface != null) {
      mcast.setInterface(InetAddress.getByName(mcInterface));
    }
    if (mcNetworkInterface != null) {
      mcast.setNetworkInterface(NetworkInterface.getByName(mcNetworkInterface));
    }
    runner=new Thread(this);
    runner.setName(this.toString() + "String_Node_Str" + runner.getName());
    runner.setDaemon(true);
    runner.start();
  }
}

Fixed version (ground truth):
@Override public void start() throws IOException, IllegalStateException {
  if (listener == null) {
    throw new IllegalStateException("String_Node_Str");
  }
  if (started.compareAndSet(false,true)) {
    if (group == null || group.length() == 0) {
      throw new IOException("String_Node_Str");
    }
    if (discoveryURI == null) {
      try {
        discoveryURI=new URI(DEFAULT_DISCOVERY_URI_STRING);
      }
 catch (      URISyntaxException e) {
      }
      if (discoveryURI == null) {
        throw new RuntimeException("String_Node_Str");
      }
    }
    LOG.trace("String_Node_Str",discoveryURI);
    String myHost=discoveryURI.getHost();
    int myPort=discoveryURI.getPort();
    if (myHost == null || DEFAULT_HOST_STR.equals(myHost)) {
      myHost=DEFAULT_HOST_IP;
    }
    if (myPort < 0) {
      myPort=DEFAULT_PORT;
    }
    LOG.trace("String_Node_Str",myHost);
    LOG.trace("String_Node_Str",myPort);
    LOG.trace("String_Node_Str",group);
    LOG.trace("String_Node_Str",mcInterface);
    LOG.trace("String_Node_Str",mcNetworkInterface);
    LOG.trace("String_Node_Str",mcJoinNetworkInterface);
    this.inetAddress=InetAddress.getByName(myHost);
    this.sockAddress=new InetSocketAddress(this.inetAddress,myPort);
    mcast=new MulticastSocket(myPort);
    mcast.setLoopbackMode(loopBackMode);
    mcast.setTimeToLive(getTimeToLive());
    if (mcJoinNetworkInterface != null) {
      mcast.joinGroup(sockAddress,NetworkInterface.getByName(mcJoinNetworkInterface));
    }
 else {
      mcast.joinGroup(inetAddress);
    }
    mcast.setSoTimeout((int)keepAliveInterval);
    if (mcInterface != null) {
      mcast.setInterface(InetAddress.getByName(mcInterface));
    }
    if (mcNetworkInterface != null) {
      mcast.setNetworkInterface(NetworkInterface.getByName(mcNetworkInterface));
    }
    runner=new Thread(this);
    runner.setName(this.toString() + "String_Node_Str" + runner.getName());
    runner.setDaemon(true);
    runner.start();
  }
}