Fixed the problem with TreeMap
Fixed the problem with TreeMap

Wilbeibi/mapreduce_examples,mohd1012/mapreduce_examples,fredhusser/mapreduce_examples,viveo/mapreduce_examples,basilrormose/mapreduce_examples,basilrormose/mapreduce_examples,gustavosoares/mapreduce_examples,xldrx/mapreduce_examples,Wilbeibi/mapreduce_examples,gustavosoares/mapreduce_examples,viveo/mapreduce_examples,Wilbeibi/mapreduce_examples,xldrx/mapreduce_examples,amandalins/mapreduce_examples,basilrormose/mapreduce_examples,mohd1012/mapreduce_examples,gustavosoares/mapreduce_examples,amandalins/mapreduce_examples,mohd1012/mapreduce_examples,fredhusser/mapreduce_examples,fredhusser/mapreduce_examples,xldrx/mapreduce_examples,viveo/mapreduce_examples,amandalins/mapreduce_examples