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如何修复hibernate lazyinitializationexception:未能延迟初始化角色集合，无法初始化代理-无会话（13个答案）
14天前关门了。
我试图获取用户的配置文件数据后登录（从登录成功过滤器），但我看到了一个例外，延迟加载数据。请参见以下示例代码：
authenticationsuccesshandler.java验证

@Component
public class AuthenticationSuccessHandler extends SavedRequestAwareAuthenticationSuccessHandler {

    @Autowired
    private UserService userService;

    @Autowired
    private Gson gson;

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
            Authentication authentication) throws ServletException, IOException {

        User user = (User) authentication.getPrincipal();
        UserLoginResponseDto userLoginResponseDto = userService.login(user.getUsername());

        response.setStatus(HttpStatus.OK.value());
        response.setContentType("application/json; charset=UTF-8");
        response.setCharacterEncoding(StandardCharsets.UTF_8.name());
        response.getWriter().println(gson.toJson(userLoginResponseDto));
        response.getWriter().flush();

        clearAuthenticationAttributes(request);
    }
}

用户服务.java

public class UserService implements UserDetailsService, TokenService {

    @Autowired
    private UserRepository userRepository;

    @Transactional(readOnly = true)
    public UserLoginResponseDto login(String email) {
        Optional<UserModel> userOptional = userRepository.findByEmailIgnoreCase(email);
        UserModel userModel = userOptional.get();
        UserLoginResponseDto userLoginResponseDto = userModel.toUserLoginResponseDto();
        return userLoginResponseDto;
    }
}

用户模型.java

public class UserModel {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(nullable = false, unique = true, updatable = false)
    private UUID id;

    [A FEW MORE FIELDS]

    @Column(length = 256, nullable = false, unique = true, updatable = false)
    private String email;

    @OneToMany(cascade = { CascadeType.ALL })
    private List<RoleModel> roleModels;

    public UserLoginResponseDto toUserLoginResponseDto() {
        return new UserLoginResponseDto().setId(id).setEmail(email).setRoles(roleModels);
    }
}

userloginresponsedto.java

public class UserLoginResponseDto {

    private UUID id;
    private String email;
    private List<RoleModel> roles;

}

在中序列化userloginresponsedto类型的对象时 AuthenticationSuccessHandler ，我看到以下错误消息-
org.hibernate.lazyinitializationexception:未能延迟初始化角色集合：usermodel.rolemodels，无法初始化代理-无会话
我如何正确解决这个问题而不采用以下任何技术？
[反模式]在视图中打开
[反模式]hibernate.enable\u lazy\u load\u no\u trans
fetchtype.eager文件