Program: 46147
Project: 46147
Buggy source:
public OrbMessageHandler(OrbCell orbCell,WonderlandSession session){
  this.orbCell=orbCell;
  this.session=session;
synchronized (detachedOrbList) {
    detachedOrbList.add(orbCell);
  }
  avatarCell=((CellClientSession)session).getLocalAvatar().getViewCell();
  CellTransform transform=orbCell.getLocalTransform();
  Vector3f translation=orbCell.getLocalTransform().getTranslation(null);
  followMe=new FollowMe(orbCell.getComponent(MovableComponent.class),translation,this);
  channelComp=orbCell.getComponent(ChannelComponent.class);
  logger.finer("String_Node_Str" + orbCell.getCellID() + "String_Node_Str"+ channelComp);
  ChannelComponent.ComponentMessageReceiver msgReceiver=new ChannelComponent.ComponentMessageReceiver(){
    public void messageReceived(    CellMessage message){
      processMessage(message);
    }
  }
;
  channelComp.addMessageReceiver(OrbAttachMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbAttachVirtualPlayerMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbSetBystanderCountMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbChangeNameMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbEndCallMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbMuteCallMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbSetVolumeMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbSpeakingMessage.class,msgReceiver);
  pm=PresenceManagerFactory.getPresenceManager(session);
  username=orbCell.getUsername();
  if (username == null) {
    username="String_Node_Str";
  }
  String playerWithVpCallID=orbCell.getPlayerWithVpCallID();
  WonderlandIdentity userID=new WonderlandIdentity(username,username,null);
  presenceInfo=new PresenceInfo(orbCell.getCellID(),null,userID,orbCell.getCallID());
  if (playerWithVpCallID == null || playerWithVpCallID.equals(orbCell.getCallID())) {
    pm.addPresenceInfo(presenceInfo);
  }
  NameTagComponent comp=new NameTagComponent(orbCell,username,(float).17);
  orbCell.addComponent(comp);
  nameTag=comp.getNameTagNode();
  if (orbCell.getPlayerWithVpCallID() != null) {
    PresenceInfo info=pm.getPresenceInfo(orbCell.getPlayerWithVpCallID());
    if (info == null) {
      logger.warning("String_Node_Str" + orbCell.getPlayerWithVpCallID());
      return;
    }
    logger.info("String_Node_Str" + orbCell.getCellID() + "String_Node_Str"+ orbCell.getPlayerWithVpCallID()+ "String_Node_Str"+ info);
    channelComp.send(new OrbAttachMessage(orbCell.getCellID(),info.cellID,true));
  }
 else {
    channelComp.send(new OrbAttachMessage(orbCell.getCellID(),null,true));
  }
}

Fixed version (ground truth):
public OrbMessageHandler(OrbCell orbCell,WonderlandSession session){
  this.orbCell=orbCell;
  this.session=session;
synchronized (detachedOrbList) {
    detachedOrbList.add(orbCell);
  }
  avatarCell=((CellClientSession)session).getLocalAvatar().getViewCell();
  CellTransform transform=orbCell.getLocalTransform();
  Vector3f translation=orbCell.getLocalTransform().getTranslation(null);
  followMe=new FollowMe(orbCell.getComponent(MovableComponent.class),translation,this);
  channelComp=orbCell.getComponent(ChannelComponent.class);
  logger.finer("String_Node_Str" + orbCell.getCellID() + "String_Node_Str"+ channelComp);
  ChannelComponent.ComponentMessageReceiver msgReceiver=new ChannelComponent.ComponentMessageReceiver(){
    public void messageReceived(    CellMessage message){
      processMessage(message);
    }
  }
;
  channelComp.addMessageReceiver(OrbAttachMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbAttachVirtualPlayerMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbSetBystanderCountMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbChangeNameMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbEndCallMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbMuteCallMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbSetVolumeMessage.class,msgReceiver);
  channelComp.addMessageReceiver(OrbSpeakingMessage.class,msgReceiver);
  pm=PresenceManagerFactory.getPresenceManager(session);
  username=orbCell.getUsername();
  if (username == null) {
    username="String_Node_Str";
  }
  usernameAlias=username;
  String playerWithVpCallID=orbCell.getPlayerWithVpCallID();
  WonderlandIdentity userID=new WonderlandIdentity(username,username,null);
  presenceInfo=new PresenceInfo(orbCell.getCellID(),null,userID,orbCell.getCallID());
  presenceInfo.usernameAlias=usernameAlias;
  if (playerWithVpCallID == null || playerWithVpCallID.equals(orbCell.getCallID())) {
    pm.addPresenceInfo(presenceInfo);
    presenceInfoAdded=true;
  }
  NameTagComponent comp=new NameTagComponent(orbCell,username,(float).17);
  orbCell.addComponent(comp);
  nameTag=comp.getNameTagNode();
  if (orbCell.getPlayerWithVpCallID() != null) {
    PresenceInfo info=pm.getPresenceInfo(playerWithVpCallID);
    if (info == null) {
      logger.warning("String_Node_Str" + playerWithVpCallID);
      return;
    }
    logger.info("String_Node_Str" + orbCell.getCellID() + "String_Node_Str"+ playerWithVpCallID+ "String_Node_Str"+ info);
    channelComp.send(new OrbAttachMessage(orbCell.getCellID(),info.cellID,true));
  }
 else {
    logger.fine("String_Node_Str" + orbCell.getCellID());
    channelComp.send(new OrbAttachMessage(orbCell.getCellID(),null,true));
  }
}