无法在下载的GitHub项目中添加代码

Question

我能够使用位于url https://github.com/raghuveerm/MRPcapParser的GitHub代码使用PcapFileInputFormat解析mlab ndt跟踪日志文件。我能够解析在＆＃34; Packet.java＆＃34;中预定义的字段（如TIMESTAMP）。但是我无法添加像（total_traffic，Total_Size）这样的新字段并解析它们。尽管我在Packet.java中包含了新字段并尝试调试代码。调试器没有输入代码我用新字段新编辑的地方。

    My Edited Code:
    ===============

    In PacketReader.java:(In hadoop-pcap-lib)
    ====================
(src-->main-->java-->net-->ripe-->hadoop-->pcap-->PcapReader.java)

    At Line 62: public static final int TOTAL_SIZE_OFFSET = 12;
    At Line 162: 

        long totalSize = PcapReaderUtil.convertInt(pcapPacketHeader, TOTAL_SIZE_OFFSET, reverseHeaderByteOrder);
                packet.put(Packet.TOTAL_SIZE, totalSize);

    In Packet.java:(In hadoop-pcap-lib)
    ==============
    (src-->main-->java-->net-->ripe-->hadoop-->pcap-->packet-->Packet.java)

    At Line 36: public static final String TOTAL_SIZE = "tot_size";

    My Mapper:
    =========
    package com.calsoftlabs.parse;

    import net.ripe.hadoop.pcap.packet.Packet;

    public class PcapMapper extends Mapper<LongWritable, ObjectWritable, Text, Text> {


        public void map(LongWritable arg0, ObjectWritable arg1, Context context) throws IOException,
                InterruptedException {

            Packet packet = (Packet) arg1.get();

            String clientIp = null;
            String serverIp = null;
            String timeStamp = null;
            String totalTraffic = null;
            String srcPort = null;
            String destPort = null;
            String fields = null;

            if (packet != null) {

                clientIp = packet.get(Packet.SRC).toString();
                srcPort = packet.get(Packet.SRC_PORT).toString();
                serverIp = packet.get(Packet.DST).toString();
                destPort = packet.get(Packet.DST_PORT).toString();
                timeStamp = packet.get(Packet.TIMESTAMP).toString();
                totalTraffic = packet.get(Packet.TOTAL_SIZE).toString();

                if (serverIp != null && srcPort != null && destPort != null ) {
                    fields = serverIp
                            .concat(", ").concat(srcPort)
                            .concat(", ").concat(destPort);
                            .concat(", ").concat(totalTraffic);

                }

            }

            context.write(new Text(clientIp.concat("_").concat(timeStamp).concat("::")), new Text(fields));
        }
    }

最后，如果我运行一个MRJob我在total_traffic附近得到一个空指针异常。因为调试器根本没有进入新编辑的代码。我怎么能克服这个问题。任何人都可以建议这个问题......

先谢谢