为什么 loadUserByUsername 方法会抛出空异常？

Question

你好， 请仅使用用户的电子邮件和密码连接用户时出错。
在堆栈跟踪中，我有一个空指针异常，因为 getUserAuthority 和 loadUserByUsername 方法不返回我的数据库中存在的用户。 这是我的 adminController 类：

@Controller

公共类 AdminController {

@GetMapping(value = { "/", "/login" })
public ModelAndView login(@RequestParam(value = "error", required = false) String error,
        @RequestParam(value = "logout", required = false) String logout) {
    ModelAndView modelAndView= new ModelAndView("login");

    if (error !=null) {
        modelAndView.addObject("error", "Invalid Username and password!");
    }
    
    if (logout !=null) {
        modelAndView.addObject("message", "You're been logout out successfully.");
    }
    return modelAndView;
}



@GetMapping(value = {"/logout"})
private String logout() {
    SecurityContextHolder.getContext().setAuthentication(null);
    return "redirect:login";
    
}

@GetMapping(value = "/home")
public String home() {
    
    return "redirect:dashboard";
}

} customUservice 类：

@Service("customUserDetailsService")

公共类 CustomuserDetailService 实现 UserDetailsS​​ervice {

private final UserService userService;

@Autowired
public CustomuserDetailService(UserService userService) {
    super();
    this.userService = userService;
}

@Override
@Transactional
public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
    UserDto userDto = userService.findUserByEmail(email);

    if (userDto !=null) {

        List<GrantedAuthority> authorities = getUserAuthority(userDto.getRolesDtos());

        return buildUserForAuthentication(userDto, authorities);
    }else {
    throw new UsernameNotFoundException("user with email" + email + "does not exist.");
}
}

private List<GrantedAuthority> getUserAuthority(Set<RoleDto> userRoles) {
    Set<GrantedAuthority> roles = new HashSet<>();
    userRoles.forEach((role) -> {
        roles.add(new SimpleGrantedAuthority(role.getName()));
        
    });
    return new ArrayList<GrantedAuthority>(roles);
    
}

private UserDetails buildUserForAuthentication(UserDto user, List<GrantedAuthority> authorities) {
    return new org.springframework.security.core.userdetails.User(user.getEmail(), user.getPassword(), authorities);
}

} 和stackTace：

休眠：选择 user0_.users_id 作为 users_id1_7_，user0_.email 作为 email2_7_，user0_.first_name 作为 first_na3_7_，user0_.last_name 作为 last_nam4_7_，user0_.mobile_number 作为 mobile_n5_7_，user0_.password 作为 password6_7_ from bankass.users user0_ where user0_.email =？ 休眠：从bankass.users_roles中选择roles0_.users_id作为users_id1_8_0_，role0_.role_id作为role_id2_8_0_，role1_.role_id作为role_id1_2_1_，role1_.role作为role2_2_1_从bankass.users_roles角色0_内部加入bankass.role role1_在role0_.role_id=role1_.role_id where roles0_.users_id= ? Hibernate: 选择 users0_.role_id 作为 role_id2_8_0_, users0_.users_id 作为 users_id1_8_0_, user1_.users_id 作为 users_id1_7_1_, user1_.email 作为 email2_7_1_, user1_.first_name 作为 first_na3_7_1_, user1_.last_name 作为 last_nam4_7_1_, user1_.mobile_number 作为 mobile_n5_从 bankass.users_roles users0_ 内部加入 bankass.users user1_ on users0_.users_id=user1_.users_id where users0_.role_id=? 休眠：从bankass.users_roles中选择roles0_.users_id作为users_id1_8_0_，role0_.role_id作为role_id2_8_0_，role1_.role_id作为role_id1_2_1_，role1_.role作为role2_2_1_从bankass.users_roles角色0_内部加入bankass.role role1_在role0_.role_id=role1_.role_id where roles0_.users_id= ? 休眠：从bankass.users_roles中选择roles0_.users_id作为users_id1_8_0_，role0_.role_id作为role_id2_8_0_，role1_.role_id作为role_id1_2_1_，role1_.role作为role2_2_1_从bankass.users_roles角色0_内部加入bankass.role role1_在role0_.role_id=role1_.role_id where roles0_.users_id= ? 休眠：从bankass.users_roles中选择roles0_.users_id作为users_id1_8_0_，role0_.role_id作为role_id2_8_0_，role1_.role_id作为role_id1_2_1_，role1_.role作为role2_2_1_从bankass.users_roles角色0_内部加入bankass.role role1_在role0_.role_id=role1_.role_id where roles0_.users_id= ? 休眠：从bankass.users_roles中选择roles0_.users_id作为users_id1_8_0_，role0_.role_id作为role_id2_8_0_，role1_.role_id作为role_id1_2_1_，role1_.role作为role2_2_1_从bankass.users_roles角色0_内部加入bankass.role role1_在role0_.role_id=role1_.role_id where roles0_.users_id= ? 2020-11-20 23:14:38.042 ERROR 330726 --- [nio-8080-exec-1] w.a.UsernamePasswordAuthenticationFilter ：尝试对用户进行身份验证时发生内部错误。

org.springframework.security.authentication.InternalAuthenticationServiceException: null 在 org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:123) ~[spring-security-core-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:144) ~[spring-security-core-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:199) ~[spring-security-core-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:219) ~[spring-security-core-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.attemptAuthentication(UsernamePasswordAuthenticationFilter.java:95) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:92) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.3.4.RELEASE.jar:5.3.4.RELEASE] 在 org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93) ~[spring-boot-actuator-2.3.4.RELEASE.jar:2.3.4.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na] 在 java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na] 在 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.38.jar:9.0.38] 在 java.base/java.lang.Thread.run(Thread.java:834) ~[na:na] 引起：java.lang.NullPointerException：null 在 com.busreseravtionsystem.busreservation.security.CustomuserDetailService.getUserAuthority(CustomuserDetailService.java:50) ~[classes/:na] 在 com.busreseravtionsystem.busreservation.security.CustomuserDetailService.loadUserByUsername(CustomuserDetailService.java:40) ~[classes/:na] 在 com.busreseravtionsystem.busreservation.security.CustomuserDetailService$$FastClassBySpringCGLIB$$b6891340.invoke() ~[classes/:na] 在 org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:367) ~[spring-tx-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118) ~[spring-tx-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.2.9.RELEASE.jar:5.2.9.RELEASE] 在 com.busreseravtionsystem.busreservation.security.CustomuserDetailService$$EnhancerBySpringCGLIB$$9c7d4a88.loadUserByUsername() ~[classes/:na] 在 org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:108) ~[spring-security-core-5.3.4.RELEASE.jar:5.3.4.RELEASE] ...省略了58个常用框架

Answer 1

role 为空，因为在 UserDTO 中我有 RoleDto。所以我需要将“roleName”重命名为“role”，因为它是一个复杂的对象。