如何解决？(标签-IDEA|关键词-while)

IDEA发生报错
org.apache.ibatis.exceptions.PersistenceException:

Error building SqlSession.

The error may exist in com/wht/mapper/DeptMapper.xml

The error occurred while processing mapper_resultMap[deptAndEmpByStepResultMap]

Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'com/wht/mapper/DeptMapper.xml'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Dept'. Cause: java.lang.ClassNotFoundException: Cannot find class: Dept

Could not resolve type alias 'Dept'. Cause: java.lang.ClassNotFoundException: Cannot find class: Dept
没有找到Dept这个类。

package com.wht.pojo;

import java.util.List;

public class Dept {
    private  Integer deptno;

    private String dname;

    private String loc;

    private List<Emp> emps;

    public Dept() {
    }

    public Dept(Integer deptno, String dname, String loc) {
        this.deptno = deptno;
        this.dname = dname;
        this.loc = loc;
    }

    public Integer getDeptno() {
        return deptno;
    }

    public void setDeptno(Integer deptno) {
        this.deptno = deptno;
    }

    public String getDname() {
        return dname;
    }

    public void setDname(String dname) {
        this.dname = dname;
    }

    public String getLoc() {
        return loc;
    }

    public void setLoc(String loc) {
        this.loc = loc;
    }

    public List<Emp> getEmps() {
        return emps;
    }

    public void setEmps(List<Emp> emps) {
        this.emps = emps;
    }

    @Override
    public String toString() {
        return "Dept{" +
                "deptno=" + deptno +
                ", dname='" + dname + '\'' +
                ", loc='" + loc + '\'' +
                ", emps=" + emps +
                '}';
    }
}

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