Program: 46153
Project: 46153
Buggy source:
public void messageReceived(WonderlandClientSender sender,WonderlandClientID clientID,CellMessage message){
  logger.finest("String_Node_Str" + message);
  VoiceManager vm=AppContext.getManager(VoiceManager.class);
  Call call=null;
  Player player=null;
  if (simulateCalls == false) {
    call=vm.getCall(callID);
    if (call == null) {
      logger.warning("String_Node_Str" + callID + "String_Node_Str"+ message);
      return;
    }
    player=vm.getPlayer(callID);
  }
  if (message instanceof OrbEndCallMessage) {
    if (call != null) {
      try {
        vm.endCall(call,true);
      }
 catch (      IOException e) {
        logger.warning("String_Node_Str" + call + "String_Node_Str"+ e.getMessage());
      }
    }
 else {
      orbStatusListenerRef.get().endCall(callID);
    }
    return;
  }
  if (message instanceof OrbMuteCallMessage) {
    if (call != null) {
      try {
        call.mute(((OrbMuteCallMessage)message).isMuted());
      }
 catch (      IOException e) {
        logger.warning("String_Node_Str" + call + "String_Node_Str"+ e.getMessage());
        return;
      }
    }
    sender.send(message);
    return;
  }
  if (message instanceof OrbChangeNameMessage) {
    username=((OrbChangeNameMessage)message).getName();
    sender.send(message);
    return;
  }
  if (message instanceof OrbChangePositionMessage) {
    OrbChangePositionMessage msg=(OrbChangePositionMessage)message;
    if (player == null) {
      return;
    }
    Vector3f position=msg.getPosition();
    player.moved(position.getX(),position.getY(),position.getZ(),player.getOrientation());
    return;
  }
  if (message instanceof OrbSetVolumeMessage) {
    if (player == null) {
      logger.warning("String_Node_Str" + callID);
      return;
    }
    OrbSetVolumeMessage msg=(OrbSetVolumeMessage)message;
    String softphoneCallID=msg.getSoftphoneCallID();
    Player softphonePlayer=vm.getPlayer(softphoneCallID);
    if (softphonePlayer == null) {
      logger.warning("String_Node_Str" + softphoneCallID);
      return;
    }
    DefaultSpatializer spatializer=(DefaultSpatializer)vm.getVoiceManagerParameters().livePlayerSpatializer.clone();
    double volume;
    if (msg.getVolume() <= 5.0) {
      volume=msg.getVolume() / 5.0;
    }
 else {
      volume=(msg.getVolume() - 5) * .8;
    }
    spatializer.setAttenuator(volume);
    if (volume == 1) {
      softphonePlayer.removePrivateSpatializer(player);
    }
 else {
      softphonePlayer.setPrivateSpatializer(player,spatializer);
    }
    return;
  }
  if (message instanceof OrbAttachMessage) {
    OrbAttachMessage msg=(OrbAttachMessage)message;
    boolean isAttached=msg.isAttached();
    if (isAttached && msg.getHostCellID() == null) {
      if (hostCellID == null) {
        return;
      }
      sender.send(clientID,new OrbAttachMessage(msg.getCellID(),hostCellID,true));
      return;
    }
    logger.fine("String_Node_Str" + msg.getHostCellID() + "String_Node_Str"+ msg.isAttached());
    if (msg.isAttached()) {
      hostCellID=msg.getHostCellID();
      orbStatusListenerRef.get().setHostCellID(hostCellID);
    }
 else {
      orbStatusListenerRef.get().removeCallStatusListener(msg.getHostCellID());
      hostCellID=null;
    }
    sender.send(message);
    return;
  }
  logger.warning("String_Node_Str" + message);
}

Fixed version (ground truth):
public void messageReceived(WonderlandClientSender sender,WonderlandClientID clientID,CellMessage message){
  logger.finest("String_Node_Str" + message);
  VoiceManager vm=AppContext.getManager(VoiceManager.class);
  Call call=null;
  Player player=null;
  if (simulateCalls == false) {
    call=vm.getCall(callID);
    if (call == null) {
      logger.warning("String_Node_Str" + callID + "String_Node_Str"+ message);
      return;
    }
    player=vm.getPlayer(callID);
  }
  if (message instanceof OrbEndCallMessage) {
    if (call != null) {
      try {
        vm.endCall(call,true);
      }
 catch (      IOException e) {
        logger.warning("String_Node_Str" + call + "String_Node_Str"+ e.getMessage());
      }
    }
 else {
      orbStatusListenerRef.get().endCall(callID);
    }
    sender.send(message);
    return;
  }
  if (message instanceof OrbMuteCallMessage) {
    if (call != null) {
      try {
        call.mute(((OrbMuteCallMessage)message).isMuted());
      }
 catch (      IOException e) {
        logger.warning("String_Node_Str" + call + "String_Node_Str"+ e.getMessage());
        return;
      }
    }
    sender.send(message);
    return;
  }
  if (message instanceof OrbChangeNameMessage) {
    username=((OrbChangeNameMessage)message).getName();
    sender.send(message);
    return;
  }
  if (message instanceof OrbChangePositionMessage) {
    OrbChangePositionMessage msg=(OrbChangePositionMessage)message;
    if (player == null) {
      return;
    }
    Vector3f position=msg.getPosition();
    player.moved(position.getX(),position.getY(),position.getZ(),player.getOrientation());
    return;
  }
  if (message instanceof OrbSetVolumeMessage) {
    if (player == null) {
      logger.warning("String_Node_Str" + callID);
      return;
    }
    OrbSetVolumeMessage msg=(OrbSetVolumeMessage)message;
    String softphoneCallID=msg.getSoftphoneCallID();
    Player softphonePlayer=vm.getPlayer(softphoneCallID);
    if (softphonePlayer == null) {
      logger.warning("String_Node_Str" + softphoneCallID);
      return;
    }
    DefaultSpatializer spatializer=(DefaultSpatializer)vm.getVoiceManagerParameters().livePlayerSpatializer.clone();
    double volume;
    if (msg.getVolume() <= 5.0) {
      volume=msg.getVolume() / 5.0;
    }
 else {
      volume=(msg.getVolume() - 5) * .8;
    }
    spatializer.setAttenuator(volume);
    if (volume == 1) {
      softphonePlayer.removePrivateSpatializer(player);
    }
 else {
      softphonePlayer.setPrivateSpatializer(player,spatializer);
    }
    return;
  }
  if (message instanceof OrbAttachMessage) {
    OrbAttachMessage msg=(OrbAttachMessage)message;
    boolean isAttached=msg.isAttached();
    if (isAttached && msg.getHostCellID() == null) {
      if (hostCellID == null) {
        return;
      }
      sender.send(clientID,new OrbAttachMessage(msg.getCellID(),hostCellID,true));
      return;
    }
    logger.fine("String_Node_Str" + msg.getHostCellID() + "String_Node_Str"+ msg.isAttached());
    if (msg.isAttached()) {
      hostCellID=msg.getHostCellID();
      orbStatusListenerRef.get().setHostCellID(hostCellID);
    }
 else {
      orbStatusListenerRef.get().removeCallStatusListener(msg.getHostCellID());
      hostCellID=null;
    }
    sender.send(message);
    return;
  }
  logger.warning("String_Node_Str" + message);
}