I have extended WritableComparable and want to store it as mapper as the mapper value.

```
public class SenderRecieverPair implements WritableComparable<BinaryComparable> {

    Set<InternetAddress> pair = new TreeSet<InternetAddress>(new Comparator<InternetAddress>() {

        @Override
        public int compare(InternetAddress add1, InternetAddress add2) {
            return add1.getAddress().compareToIgnoreCase(add2.getAddress());
        }

    });

    public SenderRecieverPair() {
        super();
    }

    public SenderRecieverPair(InternetAddress add1, InternetAddress add2) {
        super();
        pair.add(add1);
        pair.add(add1);
    }

    public Set<InternetAddress> getPair() {
        return pair;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        for (Iterator<InternetAddress> iterator = pair.iterator(); iterator.hasNext();) {
            InternetAddress email = (InternetAddress) iterator.next();
            String mailAddress = email.getAddress();
            if(mailAddress == null) {
                mailAddress = "";
            }
            byte[] address = mailAddress.getBytes("UTF-8");
            WritableUtils.writeVInt(out, address.length);
            out.write(address, 0, address.length);
            String displayName = email.getPersonal();
            if(displayName == null) {
                displayName = "";
            }
            byte[] display = displayName.getBytes("UTF-8");
            WritableUtils.writeVInt(out, display.length);
            out.write(display, 0, display.length);
        }

    }

    @Override
    public void readFields(DataInput in) throws IOException {
        for (int i = 0; i < 2; i++) {
            int length = WritableUtils.readVInt(in);
            byte[] container = new byte[length];
            in.readFully(container, 0, length);
            String mailAddress = new String(container, "UTF-8");
            length = WritableUtils.readVInt(in);
            container = new byte[length];
            in.readFully(container, 0, length);
            String displayName = new String(container, "UTF-8");
            InternetAddress address = new InternetAddress(mailAddress, displayName);
            pair.add(address);
        }

    }

    @Override
    public int compareTo(BinaryComparable o) {
        // TODO Auto-generated method stub
        return 0;
    }

}

```

However i am getting the below error.
Please help me understand and correct this

```
2013-07-29 06:49:26,753 INFO org.apache.hadoop.util.NativeCodeLoader: Loaded the native-hadoop library
    2013-07-29 06:49:26,891 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics with processName=MAP, sessionId=
    2013-07-29 06:49:27,004 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb = 100
    2013-07-29 06:49:27,095 INFO org.apache.hadoop.mapred.MapTask: data buffer = 79691776/99614720
    2013-07-29 06:49:27,095 INFO org.apache.hadoop.mapred.MapTask: record buffer = 262144/327680
    2013-07-29 06:49:27,965 INFO org.apache.hadoop.mapred.MapTask: Starting flush of map output
    2013-07-29 06:49:27,988 INFO org.apache.hadoop.mapred.TaskLogsTruncater: Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1
    2013-07-29 06:49:27,991 WARN org.apache.hadoop.mapred.Child: Error running child
    java.lang.RuntimeException: java.io.EOFException
        at org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:128)
        at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.compare(MapTask.java:967)
        at org.apache.hadoop.util.QuickSort.fix(QuickSort.java:30)
        at org.apache.hadoop.util.QuickSort.sortInternal(QuickSort.java:83)
        at org.apache.hadoop.util.QuickSort.sort(QuickSort.java:59)
        at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1253)
        at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1154)
        at org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:581)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:648)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
        at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
        at org.apache.hadoop.mapred.Child.main(Child.java:262)
    Caused by: java.io.EOFException
        at java.io.DataInputStream.readByte(DataInputStream.java:250)
        at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:299)
        at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:320)
        at com.edureka.sumit.enron.datatype.SenderRecieverPair.readFields(SenderRecieverPair.java:68)
        at org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:122)
        ... 14 more
    2013-07-29 06:49:27,993 INFO org.apache.hadoop.mapred.Task: Runnning cleanup for the task

```

Thanks