在類路徑資源 [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class] 中定義名稱為“entityManagerFactory”的 bean 創建時出錯：呼叫 init 方法失敗；嵌套例外是 org.hibernate.AnnotationException：沒有為物體指定識別符號：com.hashir.smartcity.entities.User
我使用 String 型別欄位作為我的主鍵。這是我的物體包：
用戶.java：
package com.hashir.smartcity.entities;
import javax.persistence.Entity;
@Entity
public class User extends AbstractEntity{
private String firstName;
private String lastName;
private String email;
private String password;
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;
}
}
漫游.java：
package com.hashir.smartcity.entities;
import javax.persistence.Entity;
@Entity
public class Wander extends AbstractEntity{
private String placesToEat;
private String visit;
private String metro;
public String getPlacesToEat() {
return placesToEat;
}
public void setPlacesToEat(String placesToEat) {
this.placesToEat = placesToEat;
}
public String getVisit() {
return visit;
}
public void setVisit(String visit) {
this.visit = visit;
}
public String getMetro() {
return metro;
}
public void setMetro(String metro) {
this.metro = metro;
}
}
抽象物體.java：
package com.hashir.smartcity.entities;
import javax.persistence.Id;
public class AbstractEntity {
@Id
private String location;
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
我想注冊一個用戶，提供一個登錄名，并希望我的控制器類在用戶輸入位置后立即顯示選單。下面是我的控制器類：
用戶控制器.java：
package com.hashir.smartcity.controllers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import com.hashir.smartcity.entities.User;
import com.hashir.smartcity.repos.UserRepository;
@Controller
public class UserController {
@Autowired
UserRepository userRepository;
@RequestMapping("/showReg")
public String showRegistrationPage() {
return "login/registerUser";
}
@RequestMapping(value="/registerUser",method=RequestMethod.POST)
public String register(@ModelAttribute("user")User user) {
userRepository.save(user);
return "login/login";
}
@RequestMapping(value="/login",method=RequestMethod.POST)
public String login(@RequestParam("email")String email,@RequestParam("password")String password,ModelMap modelMap) {
User user = userRepository.findByEmail(email);
if(user.getPassword().equals(password)) {
return "/enterLocation";
}
else {
modelMap.addAttribute("msg", "Incorrect user name or Password. Please try again.");
}
return "login/login";
}
@RequestMapping(value="/enterLocation",method=RequestMethod.POST)
public String enterLocation(@RequestParam("location")String location) {
return "displayMenu";
}
}
輸入Location.jsp：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Enter Location</title>
</head>
<body>
<h2>Enter Location</h2>
<form action="enterLocation" method="post">
Enter Location:<input type="text" name="location"/>
<input type="submit" value="search"/>
</form>
</body>
</html>
pom.xml：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.5</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.hashir.smartcity</groupId>
<artifactId>smartcity</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>smartcity</name>
<description>Smart City App</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
PS我只是一個初學者。
uj5u.com熱心網友回復：
正如 Navnath 已經提到的，@Entity 注釋需要在類中的一個成員上使用 @Id 符號。
通過您嘗試執行的操作，使用抽象物體類擴展所有物體，您可以在抽象類上添加 @Entity 注釋。
uj5u.com熱心網友回復：
使用MappedSuperclass
@MappedSuperclass
public abstract class AbstractEntity {
// common mappings
@Id
private String location;
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
@Entity
@Table(name = "UserTable")
public class User extends AbstractEntity {
// other mappings
}
@Entity
@Table(name = "WanderTable")
public class WanderTableObject extends AbstractEntity {
// other mappings
}
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