shiro权限控制，Object转user报错

Question

com.example.entity.UserInfo cannot be cast to com.example.entity.UserInfo

类型强转代码如下

  protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        System.out.println("权限配置-->MyShiroRealm.doGetAuthorizationInfo()");
        SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();


        UserInfo userInfo  = (UserInfo) principals.getPrimaryPrincipal();
                .......

userInfo代码如下

 package com.example.entity;
import javax.persistence.*;
import java.io.Serializable;
import java.util.List;

@Entity
public class UserInfo implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue
    private Integer uid;
    @Column(unique =true)
    private String username;//帐号
    private String name;//名称（昵称或者真实姓名，不同系统不同定义）
    private String password; //密码;
    private String salt;//加密密码的盐
    private byte state;//用户状态,0:创建未认证（比如没有激活，没有输入验证码等等）--等待验证的用户 , 1:正常状态,2：用户被锁定.
    @ManyToMany(fetch= FetchType.EAGER)//立即从数据库中进行加载数据;
    @JoinTable(name = "SysUserRole", joinColumns = { @JoinColumn(name = "uid") }, inverseJoinColumns ={@JoinColumn(name = "roleId") })
    private List<SysRole> roleList;// 一个用户具有多个角色

    public Integer getUid() {
        return uid;
    }

    public void setUid(Integer uid) {
        this.uid = uid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getSalt() {
        return salt;
    }

    public void setSalt(String salt) {
        this.salt = salt;
    }

    public byte getState() {
        return state;
    }

    public void setState(byte state) {
        this.state = state;
    }

    public List<SysRole> getRoleList() {
        return roleList;
    }

    public void setRoleList(List<SysRole> roleList) {
        this.roleList = roleList;
    }

    /**
     * 密码盐.
     * @return
     */
    public String getCredentialsSalt(){
        return this.username+this.salt;
    }
    //重新对盐重新进行了定义，用户名+salt，这样就更加不容易被破解


    @Override
    public String toString() {
        return "UserInfo{" +
                "uid=" + uid +
                ", username='" + username + '\'' +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                ", salt='" + salt + '\'' +
                ", state=" + state +
                ", roleList=" + roleList +
                '}';
    }
}

Answer 1

问题解决了，关掉springboot的热部署就可以了。但是这是啥原理啊？有没有大佬解答一下