我是新来的Map减少得到nosuchelementexception，请帮助。
在文本下面输入文件容器：

this is a hadoop program
i am writing it for first time

Map器类：

public class Mappers extends MapReduceBase implements Mapper<LongWritable, Text, IntWritable, IntWritable>{
    private Text word = new Text();
    private IntWritable singleWordCount = new IntWritable();
    private IntWritable one = new IntWritable(1);

    @Override
    public void map(LongWritable key, Text value, OutputCollector<IntWritable, IntWritable> output, Reporter reporter) throws IOException {
         StringTokenizer wordList = new StringTokenizer(value.toString());
         while (wordList.hasMoreTokens()) {
             int wordSize = wordList.nextToken().length();
             singleWordCount.set(wordSize);
             if(word != null && wordList != null && wordList.nextToken() != null){
                 word.set(wordList.nextToken());
                 output.collect(singleWordCount, one);
             }
        }
    }

}

这就是我犯的错误