Hadoop mapreduce java NullPoint Exception

Question

This is the code where I am getting error:

while (it.hasNext()) {
       elementCount = elementCount+1;
       if(first)
       {
           lattitude = Double.toString((inst.decode(it.toString()))[0]);
           longitude = Double.toString((inst.decode(it.toString()))[1]);
           first = false;

       }

This is the error:

 java.lang.NullPointerException
    at util.hashing.Geohash.decode(Geohash.java:41)
    at org.myorg.LatLong$Reduce.reduce(LatLong.java:67)
    at org.myorg.LatLong$Reduce.reduce(LatLong.java:1)
    at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
    at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:663)
    at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:426)
    at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
    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:1132)
    at org.apache.hadoop.mapred.Child.main(Child.java:249)

Answer 1

Try this:

String cords = it.next().toString();
lattitude = Double.toString((inst.decode(cords))[0]);
longitude = Double.toString((inst.decode(cords))[1]);

Instead of this:

lattitude = Double.toString((inst.decode(it.toString()))[0]);
longitude = Double.toString((inst.decode(it.toString()))[1]);