在自定义身份验证入口点中自动装配MessageSource

Question

我正在尝试通过自定义AuthenticationEntryPoint

为匿名未经授权的请求发送自定义错误

public class AccessDeniedAuthenticationEntryPoint implements AuthenticationEntryPoint {

  @Autowired
  private Messages messages;

  @Override
  public void commence(final HttpServletRequest request,
                   final HttpServletResponse response,
                   final AuthenticationException authException) throws IOException {

    response.setStatus(HttpStatus.SC_UNAUTHORIZED);
    response.setContentType(MediaType.APPLICATION_JSON);
    response.setCharacterEncoding("UTF-8");

    final ObjectMapper mapper = new ObjectMapper();
    final ApplicationErrorResponse error = new ApplicationErrorResponse(
        Message.PERMISSION_FAILED.toString(),
        messages.get(Message.PERMISSION_FAILED.toString()));

    if (response.getWriter() != null) {
        response.getWriter().write(mapper.writeValueAsString(error));
        response.getWriter().flush();
    }
}

Messages bean封装了默认的MessageSource（messages.properties），并通过MessageSourceAccessor返回值

@Component
public class Messages {

    @Autowired
    private MessageSource messageSource;

    private MessageSourceAccessor accessor;

    @PostConstruct
    private void init() {
        accessor = new MessageSourceAccessor(messageSource);
    }

    public String get(String code) {
        return accessor.getMessage(code);
    }
}

但是，当引发AccessDendiedException并调用AccessDeniedAuthenticationEntryPoint中的commence方法时，注入/自动装配的Messages对象为null。 我无法让Spring在自定义身份验证入口点中成功注入消息。 我甚至尝试注册MessageSource类型的bean

@Bean
public MessageSource messageSource() {
    ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
    messageSource.setBasenames("messages");
    messageSource.setDefaultEncoding("UTF-8");
    return messageSource;
}

并尝试在AuthenticationEntryPoint中自动装配它，但它也没有用。

如何在自定义AuthenticationEntryPoint中成功注入/自动装配MessageSource？