我正在尝试登录用户，但遇到以下异常，

ava.lang.ClassCastException: class org.springframework.security.core.userdetails.User cannot be cast to class com.gaurav.studentmanagement.customUserdetailsAndJwtFilterRequestsAndServices.UserPrincipal (org.springframework.security.core.userdetails.User and com.gaurav.studentmanagement.customUserdetailsAndJwtFilterRequestsAndServices.UserPrincipal are in unnamed module of loader 'app')

我的UserPrincipal类是：

package com.gaurav.studentmanagement.customUserdetailsAndJwtFilterRequestsAndServices;

import com.gaurav.studentmanagement.entity.User;
import com.gaurav.studentmanagement.repo.RolesRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

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


public class UserPrincipal implements UserDetails {


private final User user;

private List<String> grantedAuthorities;

public UserPrincipal(User user){
    this.user=user;
}

@Override
public Collection< ? extends GrantedAuthority > getAuthorities() {
    List<GrantedAuthority> authorities = new ArrayList<>();
    getGrantedAuthorities().forEach(p -> {
        GrantedAuthority authority = new SimpleGrantedAuthority(p);
        authorities.add(authority);
    });

    // Extract list of roles (ROLE_name)
    getGrantedAuthorities().forEach(r -> {
        GrantedAuthority authority = new SimpleGrantedAuthority("ROLE_" + r);
        authorities.add(authority);
    });

    return authorities;
}

@Override
public String getPassword() {
    return this.user.getPassword();
}

public User getUser(){
    return user;
}

@Override
public String getUsername() {
    return this.user.getEmail();
}

@Override
public boolean isAccountNonExpired() {
    return false;
}

public List<String> getGrantedAuthorities() {
    return grantedAuthorities;
}

@Override
public boolean isAccountNonLocked() {
    return false;
}

@Override
public boolean isCredentialsNonExpired() {
    return false;
}

@Override
public boolean isEnabled() {
    return false;
}

}
我正在使用以下方法获取登录用户：

@Override
public User getLoggedInUser() {
    UserPrincipal userPrincipal = (UserPrincipal) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
    User user=userPrincipal.getUser();
    if(user==null){
        throw new CustomException("Not authorized");
    }
    return user;

}

每当调试器指向：

UserPrincipal userPrincipal = (UserPrincipal) SecurityContextHolder.getContext().getAuthentication().getPrincipal();

抛出上面的异常，可能是什么问题，我试图从getLoggedInUser返回User，但是不知道哪里出错了，我想我返回了正确的User，得到了本金，但是找不到哪里出错了。
自定义用户详细信息服务类：

package com.gaurav.studentmanagement.customUserdetailsAndJwtFilterRequestsAndServices;

import com.gaurav.studentmanagement.entity.Roles;
import com.gaurav.studentmanagement.entity.User;
import com.gaurav.studentmanagement.repo.RolesRepo;
import com.gaurav.studentmanagement.repo.UserRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
@Service
public class CustomUserDetails implements UserDetailsService {

    @Autowired
    UserRepo userRepo;
    @Autowired
    RolesRepo rolesRepo;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        Optional< User > user = userRepo.fetchByEmail(username);

        if (user.isPresent()) {
            List< Roles > roles = rolesRepo.findByUserId(user.get().getuId());
            System.out.println(roles + " are the roles");
            List< SimpleGrantedAuthority > authorities = new ArrayList<>();
            for (Roles roles1 : roles) {
                System.out.println(roles1.getRoleName()+" are the roles");
                authorities.add(new SimpleGrantedAuthority(roles1.getRoleName()));
            }
            return new org.springframework.security.core.userdetails.User(user.get().getEmail(), user.get().getPassword(), authorities);
        }
        else {
            throw new UsernameNotFoundException("User "+ username+" does not exist");
        }
    }
}