Program: 96696
Project: 96696
Buggy source:
public void processDataPacket(RaknetDataPacket dataPacket){
  this.lastPacketReceived=System.currentTimeMillis();
  if (dataPacket.getSequenceNumber() - this.lastSequenceNum > 1) {
    for (int i=this.lastSequenceNum + 1; i < dataPacket.getSequenceNumber(); i++) {
      this.queueNACK.add(i);
    }
  }
  this.lastSequenceNum=dataPacket.getSequenceNumber();
  this.queueACK.add(dataPacket.getSequenceNumber());
  if (dataPacket.getEncapsulatedPackets().isEmpty()) {
    return;
  }
  for (  EncapsulatedPacket epacket : dataPacket.getEncapsulatedPackets()) {
    if (epacket.hasSplit) {
      System.out.println("String_Node_Str" + epacket.splitID + "String_Node_Str"+ epacket.splitIndex+ "String_Node_Str"+ epacket.splitCount);
      if (epacket.splitIndex == epacket.splitCount - 1) {
        if (splits.containsKey((Integer)epacket.splitID)) {
          splits.get((Integer)epacket.splitID).write(epacket.buffer);
          byte[] buff=splits.get((Integer)epacket.splitID).toByteArray();
          splits.remove((Integer)epacket.splitID);
          processPacketBuffer(buff);
        }
      }
 else {
        try {
          if (epacket.splitIndex == 0) {
            ByteArrayOutputStream oup=new ByteArrayOutputStream();
            oup.write(epacket.buffer);
            splits.put((Integer)epacket.splitID,oup);
          }
 else {
            if (splits.containsKey((Integer)epacket.splitID)) {
              splits.get((Integer)epacket.splitID).write(epacket.buffer);
            }
          }
        }
 catch (        IOException ex) {
        }
      }
      continue;
    }
    processPacketBuffer(epacket.buffer);
  }
}

Fixed version (ground truth):
public void processDataPacket(RaknetDataPacket dataPacket){
  this.lastPacketReceived=System.currentTimeMillis();
  if (dataPacket.getSequenceNumber() - this.lastSequenceNum > 1) {
    for (int i=this.lastSequenceNum + 1; i < dataPacket.getSequenceNumber(); i++) {
      this.queueNACK.add(i);
    }
  }
  this.lastSequenceNum=dataPacket.getSequenceNumber();
  this.queueACK.add(dataPacket.getSequenceNumber());
  if (dataPacket.getEncapsulatedPackets().isEmpty()) {
    return;
  }
  for (  EncapsulatedPacket epacket : dataPacket.getEncapsulatedPackets()) {
    if (epacket.hasSplit) {
      System.out.println("String_Node_Str" + epacket.splitID + "String_Node_Str"+ epacket.splitIndex+ "String_Node_Str"+ epacket.splitCount);
      if (epacket.splitIndex == epacket.splitCount - 1) {
        if (splits.containsKey((Integer)epacket.splitID)) {
          try {
            splits.get((Integer)epacket.splitID).write(epacket.buffer);
          }
 catch (          IOException ex) {
            ex.printStackTrace();
          }
          byte[] buff=splits.get((Integer)epacket.splitID).toByteArray();
          splits.remove((Integer)epacket.splitID);
          splitCounter.remove((Integer)epacket.splitID);
          processPacketBuffer(buff);
        }
      }
 else {
        try {
          if (epacket.splitIndex == 0) {
            ByteArrayOutputStream oup=new ByteArrayOutputStream();
            oup.write(epacket.buffer);
            splits.put((Integer)epacket.splitID,oup);
            splitCounter.put((Integer)epacket.splitID,-1);
          }
 else {
            if (splits.containsKey((Integer)epacket.splitID) && (splitCounter.get((Integer)epacket.splitID) < epacket.splitIndex)) {
              splits.get((Integer)epacket.splitID).write(epacket.buffer);
              splitCounter.put((Integer)epacket.splitID,epacket.splitIndex);
            }
          }
        }
 catch (        IOException ex) {
        }
      }
      continue;
    }
    processPacketBuffer(epacket.buffer);
  }
}