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WebSecurityConfigurerAdapter中配置
@Autowired
    private UserDetailsManagerServiceImpl userDetailsManagerService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth)
            throws Exception {
        auth.authenticationProvider(authProvider).userDetailsService(userDetailsManagerService);
    }

@Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors()
                .and().csrf().disable()
                .authorizeRequests()
                .anyRequest()
                .authenticated()


                .and()
                .formLogin()
                .loginPage(LOGIN_PAGE_URL)
                .loginProcessingUrl(LOGIN_URL)
                .failureHandler(authenticationFailureHandler)
                .successHandler(authenticationSuccessHandler)
                .permitAll()


                .and()
                .sessionManagement()
                .invalidSessionUrl(LOGIN_PAGE_URL)
                // 同一用户最大session数
                .maximumSessions(1)
                // 达到最大数不禁止登录，第二个会挤掉前一个；若设置为true，则第二个人被禁止登录
                .maxSessionsPreventsLogin(false)
                .expiredUrl(LOGIN_PAGE_URL)
                .sessionRegistry(sessionRegistry());
//                .and()
//                .exceptionHandling()
//                .authenticationEntryPoint((request, response, authException) -> response.getWriter().write(new ResponseBean().error(AdminError.ADMIN_ACCESS_DENIED_ERROR).toString()))
//                .accessDeniedHandler(accessDeniedHandler());
    }
UserDetailsService代码
@Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        Admin admin = null;
        // 查询用户信息
        if (CommonStringUtils.isPhoneNo(username)) {
            // 手机登录
            admin = new Admin().selectOne(Wrappers.<Admin>lambdaQuery()
                    .eq(Admin::getPhone, username));
        } else {
            admin = new Admin().selectOne(Wrappers.<Admin>lambdaQuery()
                    .eq(Admin::getUsername, username));
        }

        if (admin == null) {
            throw new UsernameNotFoundException("用户不存在");
        }


        // 查询用户权限
        val permissions = rolePermissionService.selectRolePermissions(admin.getId());

        return new ManagerUserDetails(admin, AuthorityUtils.commaSeparatedStringToAuthorityList(permissions));
    }
找原因

然而throw new UsernameNotFoundException("用户不存在");的异常信息无法被截获，debug发现在ProviderManager中for (AuthenticationProvider provider : getProviders()) {getProviders()有两个，一个是自定义的AuthenticationProvider，一个是DaoAuthenticationProvider。

解决

搜索发现原来是userDetailsService配置方式不正确，改为重写方式一切正常：

@Override
    protected UserDetailsService userDetailsService() {
        return new UserDetailsManagerServiceImpl();
    }

https://github.com/spring-projects/spring-security/issues/4149#issuecomment-490500277

第三点里面有说使用AuthenticationManagerBuilder配置auth.userDetailsService()默认会注册DaoAuthenticationProvider

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