java.lang.NoSuchMethodException: cn.pb.bean.Category.()报错

代码如下：

package cn.pb.bean;

import java.util.ArrayList;
import java.util.List;

/**
 * 分类的实体类
 */
public class Category {
    private Integer cid;
    private String cname;
    private Integer pid;

    //父分类下子分类的集合
    private List<Category> list = new ArrayList<Category>();

    public Integer getCid() {
        return cid;
    }

    public void setCid(Integer cid) {
        this.cid = cid;
    }

    public String getCname() {
        return cname;
    }

    public void setCname(String cname) {
        this.cname = cname;
    }

    public Integer getPid() {
        return pid;
    }

    public void setPid(Integer pid) {
        this.pid = pid;
    }

    public List<Category> getList() {
        return list;
    }

    public void setList(List<Category> list) {
        this.list = list;
    }

    public Category(Integer cid, String cname, Integer pid, List<Category> list) {
        this.cid = cid;
        this.cname = cname;
        this.pid = pid;
        this.list = list;
    }

    @Override
    public String toString() {
        return "Category{" +
                "cid=" + cid +
                ", cname='" + cname + '\'' +
                ", pid=" + pid +
                ", list=" + list +
                '}';
    }
}

最后发现是我在代码最后写了个有参构造，重载了构造函数，而Mybatis在load进一个bean类时，需要无参构造从而导致了该错误，

解决方法，给代码加上午参构造即可！

public Category() {
    super();
}