hadoop报错什么签名问题求解决啊

小弟刚接触hadoop不久，准备跑个HelloWord试试，结果就报错了，找不到解决方法啊，
各位大神帮帮忙吧！

Mapper后面需要写上输入类型和输出类型，就像这样：

 public class MapperClass extends Mapper<Object, Text, Text, IntWritable>{
    private Text result = new Text();
    private IntWritable one = new IntWritable(1);
    @Override
    protected void map(Object key, Text value,Context context)
            throws IOException, InterruptedException {
        //获取值
        String[] strs = value.toString().split(" ");
        //提取出key ，value设置为1
        for(String str:strs)
        {
            result.set(str);
            context.write(result, one);
        }
    }


}