我试图在spring boot 1.5.22上的应用程序中返回自定义身份验证错误消息。
问题在于，在重写的“开始”方法中，不可能更改响应。response.iscommitted（）始终返回true。因此，不可能更改响应的正文或标题。。。
连接自定义入口点：

@Configuration
@EnableResourceServer
public class APIConfigurationAdapter extends ResourceServerConfigurerAdapter {
    @Autowired
    private TestEntryPoint entryPoint ;
    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/api/oauth2/**").anonymous().and().authorizeRequests()
                .antMatchers("/oauth/**").anonymous().and().authorizeRequests().and()
                .exceptionHandling().authenticationEntryPoint(entryPoint);
    }
...

入口点：

@Component
public class TestEntryPoint implements AuthenticationEntryPoint {
    @Override
    public void commence(HttpServletRequest request, HttpServletResponse response,
                         AuthenticationException authException)
            throws IOException,
            ServletException {
        //response.isCommitted() == true
        //response.getStatus() == 500
        response.setStatus(400);
        //response.getStatus() == 500 :(
        //throws IllegalStateException (Cannot call sendError() after the response has been committed)
        response.sendError(400);
    }
}

我不明白原因是什么。