**Unable to initialize any output collecto**r

1. 问题所在
   错误提示很简单
   原因是之前包装对象实现的是Writable和Comparable两个接口
   导致出现Unable to initialize any output collector
   后来修改为一个实现类 WritableComparable 问题解决
   —-`

package cn.edu360.mr.sort;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;

//封装url 总次数count
public class PageCount implements **WritableComparabl**e{

private String url;
private int count;


public PageCount() {
    super();
    // TODO Auto-generated constructor stub
}


public PageCount(String url, int count) {

    this.url = url;
    this.count = count;
}


public String getUrl() {
    return url;
}
public void setUrl(String url) {
    this.url = url;
}
public int getCount() {
    return count