Program: 86292
Project: 86292
Buggy source:
@Override public void onMessage(String chan,String message){
  Core.logDebug(chan + "String_Node_Str" + message+ "String_Node_Str");
switch (chan) {
case REAPCHANNEL:
{
      NetworkServer server=getServer(message);
      if (server == null)       return;
      removeServer(server);
      break;
    }
case LINK_CHANNEL:
{
    if (message.equals("String_Node_Str")) {
      linkServer();
      return;
    }
    String[] split=message.split("String_Node_Str");
    if (split.length == 1)     return;
    String cmd=split[0];
    if (cmd.equals("String_Node_Str")) {
      if (split.length < 2)       return;
      NetworkServer server=getServer(split[1]);
      if (server == null)       return;
      removeServer(server);
    }
    break;
  }
case HEARTBEAT_CHAN:
{
  String[] split=message.split("String_Node_Str");
  if (split.length != 3)   return;
  String name=split[0];
  if (name.equals(thisServer.getName()))   return;
  String uuids=split[1];
  Integer maxPlayers=Integer.parseInt(split[2]);
  BungeeCordServer server=(BungeeCordServer)getServer(name);
  if (server == null) {
    server=new BungeeCordServer(name,maxPlayers,BungeeCordNetworkManager.this);
    addServer(server);
  }
  server.getUuids().clear();
  if (!uuids.equals("String_Node_Str")) {
    for (    String s : uuids.split("String_Node_Str")) {
      server.getUuids().add(UUID.fromString(s));
    }
  }
  server.setLastPing(new Date());
  break;
}
case NET_COMMAND_CHANNEL:
{
try {
  JSONObject parse=(JSONObject)JSONValue.parse(message);
  if (!parse.get("String_Node_Str").equals(getThisServer().getName()))   return;
  String sender=(String)parse.get("String_Node_Str");
  NetworkServer server=getServer(sender);
  if (server == null)   return;
  JSONObject jsonObject=(JSONObject)parse.get("String_Node_Str");
  NetCommand netCommand=NetworkUtils.decodeNetCommand(jsonObject);
  for (  NetCommandHandler netCommandHandler : netCommandHandlers.get(netCommand.getClass())) {
    netCommandHandler.handleNetCommand(server,netCommand);
  }
}
 catch (Exception e) {
  Core.logDebug("String_Node_Str" + message);
  if (Core.DEBUG)   e.printStackTrace();
}
}
}
}

Fixed version (ground truth):
@Override public void onMessage(String chan,String message){
  Core.logDebug(chan + "String_Node_Str" + message+ "String_Node_Str");
  try {
    lock.lock();
switch (chan) {
case REAPCHANNEL:
{
        NetworkServer server=getServer0(message);
        if (server == null)         return;
        removeServer0(server);
        break;
      }
case LINK_CHANNEL:
{
      if (message.equals("String_Node_Str")) {
        linkServer0();
        return;
      }
      String[] split=message.split("String_Node_Str");
      if (split.length == 1)       return;
      String cmd=split[0];
      if (cmd.equals("String_Node_Str")) {
        if (split.length < 2)         return;
        NetworkServer server=getServer0(split[1]);
        if (server == null)         return;
        removeServer0(server);
      }
      break;
    }
case HEARTBEAT_CHAN:
{
    String[] split=message.split("String_Node_Str");
    if (split.length != 3)     return;
    String name=split[0];
    if (name.equals(thisServer.getName()))     return;
    String uuids=split[1];
    Integer maxPlayers=Integer.parseInt(split[2]);
    BungeeCordServer server=(BungeeCordServer)getServer0(name);
    if (server == null) {
      server=new BungeeCordServer(name,maxPlayers,BungeeCordNetworkManager.this);
      addServer0(server);
    }
    server.getUuids().clear();
    if (!uuids.equals("String_Node_Str")) {
      for (      String s : uuids.split("String_Node_Str")) {
        server.getUuids().add(UUID.fromString(s));
      }
    }
    server.setLastPing(new Date());
    break;
  }
case NET_COMMAND_CHANNEL:
{
  try {
    JSONObject parse=(JSONObject)JSONValue.parse(message);
    if (!parse.get("String_Node_Str").equals(getThisServer().getName()))     return;
    String sender=(String)parse.get("String_Node_Str");
    NetworkServer server=getServer0(sender);
    if (server == null)     return;
    JSONObject jsonObject=(JSONObject)parse.get("String_Node_Str");
    NetCommand netCommand=NetworkUtils.decodeNetCommand(jsonObject);
    for (    NetCommandHandler netCommandHandler : netCommandHandlers.get(netCommand.getClass())) {
      netCommandHandler.handleNetCommand(server,netCommand);
    }
  }
 catch (  Exception e) {
    Core.logDebug("String_Node_Str" + message);
    if (Core.DEBUG)     e.printStackTrace();
  }
}
}
}
  finally {
lock.unlock();
}
}