无法调用 findByEmail,因为 "this.userRepository" 为空错误
Cannot invoke findByEmail because "this.userRepository" is null error
每次我尝试处理我的 /register 方法时,我都会收到 Cannot invoke "com.***.repositories.UserRepository.findByEmail(String)" because "this.userRepository" is null 错误。
我不明白为什么代码显示为空。
控制器-
@Controller
@RestController
@RequestMapping("/api/v1")
@CrossOrigin(origins = "*", allowedHeaders = "*")
public class AuthenticationController {
@Autowired
UserService userService;
UserRepository userRepository;
AuthenticationTokenRepository authenticationTokenRepository;
@PostMapping(value = "/register")
public ModelAndView registerUser(ModelAndView modelAndView, User user) {
User existingUser = userRepository.findByEmail(user.getEmail());
if (existingUser != null) {
modelAndView.addObject("message", "This email already exists!");
modelAndView.setViewName("error");
} else {
userRepository.save(user);
AuthenticationToken authenticationToken = new AuthenticationToken(user);
authenticationTokenRepository.save(authenticationToken);
SimpleMailMessage mailMessage = new SimpleMailMessage();
mailMessage.setTo(user.getEmail());
mailMessage.setSubject("Complete Registration!");
mailMessage.setFrom("***@gmail.com");
mailMessage.setText("To confirm your account, please click here : "
+ "http://localhost:8080/confirm-account?token=" + authenticationToken.getConfirmationToken());
emailSenderService.sendEmail(mailMessage);
modelAndView.addObject("email", user.getEmail());
modelAndView.setViewName("successfulRegisteration");
}
return modelAndView;
}
}
axios调用-
submit() {
let formData = new FormData();
formData.set("firstName" , this.firstName)
formData.set("lastName", this.lastName)
formData.set("email", this.email)
formData.set("password", this.password)
formData.set("captchaToken", this.captchaToken)
formData.set("agreedToTermsOfService", true)
axios.post("http://localhost:8080/api/v1/register", formData,
{headers: {'Content-Type': 'application/json'}})
.then(res => {
if (res.status === 200) {
this.$router.push('/register-complete');
} else {
console.log(res.data.code);
}
})
.catch(function (err) {
console.log(err);
})
}
我的用户存储库-
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
User findByEmail(String email);
}
只需将@Autowired 添加到您希望通过spring自动装配的相关字段即可。
从
更改您的代码
@Autowired
UserService userService;
UserRepository userRepository;
AuthenticationTokenRepository authenticationTokenRepository;
至
@Autowired
UserService userService;
@Autowired
UserRepository userRepository;
@Autowired
AuthenticationTokenRepository authenticationTokenRepository;
我有两个解决方案。
从字段中删除@Autowired;
将它们替换为构造函数参数(Spring 自动理解这些参数,如果您只有一个构造函数,则无需 @Autowired 注释)。
在“配置class”中使用@Autowired 创建字段注入,例如(安全配置)并使用参数化构造函数创建目标class 对象并传递注入的字段。
每次我尝试处理我的 /register 方法时,我都会收到 Cannot invoke "com.***.repositories.UserRepository.findByEmail(String)" because "this.userRepository" is null 错误。
我不明白为什么代码显示为空。
控制器-
@Controller
@RestController
@RequestMapping("/api/v1")
@CrossOrigin(origins = "*", allowedHeaders = "*")
public class AuthenticationController {
@Autowired
UserService userService;
UserRepository userRepository;
AuthenticationTokenRepository authenticationTokenRepository;
@PostMapping(value = "/register")
public ModelAndView registerUser(ModelAndView modelAndView, User user) {
User existingUser = userRepository.findByEmail(user.getEmail());
if (existingUser != null) {
modelAndView.addObject("message", "This email already exists!");
modelAndView.setViewName("error");
} else {
userRepository.save(user);
AuthenticationToken authenticationToken = new AuthenticationToken(user);
authenticationTokenRepository.save(authenticationToken);
SimpleMailMessage mailMessage = new SimpleMailMessage();
mailMessage.setTo(user.getEmail());
mailMessage.setSubject("Complete Registration!");
mailMessage.setFrom("***@gmail.com");
mailMessage.setText("To confirm your account, please click here : "
+ "http://localhost:8080/confirm-account?token=" + authenticationToken.getConfirmationToken());
emailSenderService.sendEmail(mailMessage);
modelAndView.addObject("email", user.getEmail());
modelAndView.setViewName("successfulRegisteration");
}
return modelAndView;
}
}
axios调用-
submit() {
let formData = new FormData();
formData.set("firstName" , this.firstName)
formData.set("lastName", this.lastName)
formData.set("email", this.email)
formData.set("password", this.password)
formData.set("captchaToken", this.captchaToken)
formData.set("agreedToTermsOfService", true)
axios.post("http://localhost:8080/api/v1/register", formData,
{headers: {'Content-Type': 'application/json'}})
.then(res => {
if (res.status === 200) {
this.$router.push('/register-complete');
} else {
console.log(res.data.code);
}
})
.catch(function (err) {
console.log(err);
})
}
我的用户存储库-
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
User findByEmail(String email);
}
只需将@Autowired 添加到您希望通过spring自动装配的相关字段即可。
从
更改您的代码 @Autowired
UserService userService;
UserRepository userRepository;
AuthenticationTokenRepository authenticationTokenRepository;
至
@Autowired
UserService userService;
@Autowired
UserRepository userRepository;
@Autowired
AuthenticationTokenRepository authenticationTokenRepository;
我有两个解决方案。
从字段中删除@Autowired; 将它们替换为构造函数参数(Spring 自动理解这些参数,如果您只有一个构造函数,则无需 @Autowired 注释)。
在“配置class”中使用@Autowired 创建字段注入,例如(安全配置)并使用参数化构造函数创建目标class 对象并传递注入的字段。