Spring Boot：创建名为“springSecurityFilterChain”的 bean 时出错

Question

这是错误：

当我在 Spring Boot 中使用 spring security 时，出现错误。 我已经搜索过谷歌，并阅读了 Spring 文档，但我仍然遇到了问题。 我不明白这个错误是什么意思。

Answer 1

根据我在屏幕截图中看到的内容，我猜测您的UserDetailsServiceImpl实例为null 。

为了真正帮助您，请添加堆栈跟踪。 不是截图，而是文字。

Answer 2

public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

UserDetailsServicelmpl userDetailsService;


AuthEntryPointjwt unauthorizedHandler;

@Bean
public AuthTokenFilter authenticationJwtTokenFilter() {
    return new AuthTokenFilter();
}

@Override
public void configure(AuthenticationManagerBuilder authenticationManagerBuilder) throws Exception {
    authenticationManagerBuilder.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
}

@Bean
@Override
public AuthenticationManager authenticationManagerBean() throws Exception {
    return super.authenticationManagerBean();
}

@Bean
public PasswordEncoder passwordEncoder() {
    return new BCryptPasswordEncoder();
}

@Override
protected void configure(HttpSecurity http) throws Exception {
    http.cors().and().csrf().disable()
            .exceptionHandling().authenticationEntryPoint(unauthorizedHandler).and()
            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()
            .authorizeRequests().antMatchers("/api/auth/**").permitAll()
            .antMatchers("/api/test/**").permitAll()
            .anyRequest().authenticated();

    http.addFilterBefore(authenticationJwtTokenFilter(), UsernamePasswordAuthenticationFilter.class);
}

@Autowired UserRepository userRepository;

@Transactional
@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    User user = userRepository.findByUsername(username)
            .orElseThrow(()->new UsernameNotFoundException("User not found with username"+ username));
    return  UserDetailslmpl.build(user);
}