我現在有幾個星期有這個錯誤,我不知道如何解決它。 Stack Overflow的類似解決方案不適合我的項目。創建名爲'mainController'的bean時出錯:通過字段'userRepository'表示的不滿意的依賴關係
我目前使用MySQL數據庫,但遇到這樣的問題時試圖啓動服務器:堆棧跟蹤
[錯誤]未能執行目標org.springframework.boot:彈簧引導行家-plugin:1.5.6.RELEASE:在項目iPbackend上運行(default-cli):運行時發生異常。 null:InvocationTargetException:創建名稱爲'mainController'的bean時出錯:通過字段'userRepository'表示的不滿足的依賴關係;嵌套的異常是org.springframework.beans.factory.NoSuchBeanDefinitionException:沒有可用的bean類型'com.resource.iPbackend.UserRepository'可用:預計至少有1個bean有資格作爲autowire候選者。依賴註解:{@ org.springframework.beans.factory.annotation.Autowired(必需=真)
我用這mainController: MainController.java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import com.resource.iPbackend.UserRepository;
import com.resource.iPbackend.User;
@Controller
@RequestMapping(path = "/main")
public class MainController {
@Autowired
private UserRepository userRepository;
@RequestMapping(path = "/reg", method = RequestMethod.POST)
public @ResponseBody String regNewUser (@RequestParam String firstName, @RequestParam String lastName, @RequestParam String email, @RequestParam String password, @RequestParam String username) {
User n = new User();
n.setFirstName(firstName);
n.setLastName(lastName);
n.setEmail(email);
n.setPassword(password);
n.setUsername(username);
userRepository.save(n);
return "User is stored in database: " + n;
}
@GetMapping(path = "/all")
public @ResponseBody Iterable<User> getAllUsers() {
return userRepository.findAll();
}
}
加上這個倉庫: UserRepository.java
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.resource.iPbackend.User;
@Repository
public interface UserRepository extends CrudRepository<User, Long> {
}
而這個實體: User.java
import org.springframework.data.annotation.Id;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String firstName;
private String lastName;
private String email;
private String password;
private String username;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
您沒有任何類實現接口'UserRepository',因此'@ AutoWired'無法在控制器中使用它時初始化實例 –
@TuyenNguyen存儲庫作爲特例處理,因爲它使用' @ Repostory' – Jason
檢查您的配置(基於Java或XML)是否是組件掃描或聲明您嘗試自動裝配的bean。 – Jason