BeanDefinitionParsingException：配置问题：@Configuration类'SecurityConfig'可能不是最终的

Question

今天我重建我的项目，并收到以下错误消息：

org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: @Configuration class 'SecurityConfig' may not be final. Remove the final modifier to continue.
    Offending resource: class path resource [com/easythings/booky/config/SecurityConfig.class]
        at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:72) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]

如果我将班级更改为“开放”，则会遇到有关该班级字段的下一个错误。

班级：

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(securedEnabled = true, jsr250Enabled = true, prePostEnabled = true)
class SecurityConfig : WebSecurityConfigurerAdapter() {
    @Autowired
    internal var customUserDetailsService: CustomUserDetailsService? = null

    @Autowired
    private val unauthorizedHandler: JwtAuthenticationEntryPoint? = null

    @Bean
    fun jwtAuthenticationFilter(): JwtAuthenticationFilter {
        return JwtAuthenticationFilter()
    }

    @Throws(Exception::class)
    public override fun configure(authenticationManagerBuilder: AuthenticationManagerBuilder?) {
        authenticationManagerBuilder!!
                .userDetailsService<UserDetailsService>(customUserDetailsService)
                .passwordEncoder(passwordEncoder())
    }

    @Bean(BeanIds.AUTHENTICATION_MANAGER)
    @Throws(Exception::class)
    override fun authenticationManagerBean(): AuthenticationManager {
        return super.authenticationManagerBean()
    }

    @Bean
    fun passwordEncoder(): PasswordEncoder {
        return BCryptPasswordEncoder()
    }

    @Throws(Exception::class)
    override fun configure(http: HttpSecurity) {
        http
                .cors()
                .and()
                .csrf()
                .disable()
                .exceptionHandling()
                .authenticationEntryPoint(unauthorizedHandler)
                .and()
                .sessionManagement()
                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                .antMatchers("/",
                        "/favicon.ico",
                        "/**/*.png",
                        "/**/*.gif",
                        "/**/*.svg",
                        "/**/*.jpg",
                        "/**/*.html",
                        "/**/*.css",
                        "/**/*.js")
                .permitAll()
                .antMatchers("/api/auth/**")
                .permitAll()
                .antMatchers("/api/user/checkUsernameAvailability", "/api/user/checkEmailAvailability")
                .permitAll()
                .antMatchers(HttpMethod.GET, "/api/users/**")
                .permitAll()
                .anyRequest()
                .authenticated()

        http.addFilterBefore(jwtAuthenticationFilter(), UsernamePasswordAuthenticationFilter::class.java)
    }
}

昨天有效，我没有更改代码中的任何内容。我只需要做的一项更改就是在配置中再次设置JVM版本。

如何解决？