Java 弹簧靴-x201C；创建名为'；实体管理工厂&x27”；-开始

我看到了很多问题，但答案并不能满足我的问题

我用Spring初始化ZR生成我的项目

我尝试了3个java版本14、11、8

这是我的项目结构

GardenApplication.java。我包括了所有的附件，甚至spring doc说使用@SpringBootApplication就足够了。在此错误之前，找不到@Repository，我包含了@EnableJpaRepositories

package com.garden.garden;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan({"com.garden.garden.controller", "com.garden.garden.service.impl"})
@EnableJpaRepositories(basePackages = {"com.garden.garden.repository"})
@EntityScan(basePackages = {"com.garden.garden.model"})
public class GardenApplication {

    public static void main(String[] args) {
        SpringApplication.run(GardenApplication.class, args);
    }

}

VegetableController.java

package com.garden.garden.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.garden.garden.model.Vegetable;
import com.garden.garden.service.VegetableService;

@Controller
@RequestMapping
public class VegetableController {

    @Autowired
    private VegetableService vegetableService;

    @GetMapping("/vegetableList")
    public String list(Model model) {
        List<Vegetable> listVegetables = vegetableService.list();
        model.addAttribute("vegetables", listVegetables);
        return "index";
    }

}

package com.garden.garden.service.impl;

import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.garden.garden.model.Vegetable;
import com.garden.garden.repository.VegetableRepository;
import com.garden.garden.service.VegetableService;

@Service
public class VegetableServiceImpl implements VegetableService {

    @Autowired
    private VegetableRepository vegetableRepository;

    @Override
    public List<Vegetable> list() {
        return (List<Vegetable>) vegetableRepository.findAll();
    }

    @Override
    public Optional<Vegetable> listById(int id) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int save(Vegetable vegetable) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void delete(int id) {
        // TODO Auto-generated method stub

    }

}

package com.garden.garden.service;

import java.util.List;
import java.util.Optional;

import com.garden.garden.model.Vegetable;

public interface VegetableService {
    public List<Vegetable> list();
    public Optional<Vegetable> listById(int id);
    public int save(Vegetable vegetable);
    public void delete(int id);
}

package com.garden.garden.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.garden.garden.model.Vegetable;

@Repository
public interface VegetableRepository extends JpaRepository<Vegetable, Integer> {

}

package com.garden.garden.model;

import java.math.BigDecimal;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "vegetable")
public class Vegetable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String name;
    private String family;
    private int daysOnNursery;
    private int daysToGrow;
    private int daysHarvesting;
    private java.math.BigDecimal plantsPerSquare;
    private java.math.BigDecimal price;
    private java.math.BigDecimal weight;



    public Vegetable(int id, String name, String family, int daysOnNursery, int daysToGrow, int daysHarvesting,
            BigDecimal plantsPerSquare, BigDecimal price, BigDecimal weight) {
        super();
        this.id = id;
        this.name = name;
        this.family = family;
        this.daysOnNursery = daysOnNursery;
        this.daysToGrow = daysToGrow;
        this.daysHarvesting = daysHarvesting;
        this.plantsPerSquare = plantsPerSquare;
        this.price = price;
        this.weight = weight;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getFamily() {
        return family;
    }

    public void setFamily(String family) {
        this.family = family;
    }

    public int getDaysOnNursery() {
        return daysOnNursery;
    }

    public void setDaysOnNursery(int daysOnNursery) {
        this.daysOnNursery = daysOnNursery;
    }

    public int getDaysToGrow() {
        return daysToGrow;
    }

    public void setDaysToGrow(int daysToGrow) {
        this.daysToGrow = daysToGrow;
    }

    public int getDaysHarvesting() {
        return daysHarvesting;
    }

    public void setDaysHarvesting(int daysHarvesting) {
        this.daysHarvesting = daysHarvesting;
    }

    public java.math.BigDecimal getPlantsPerSquare() {
        return plantsPerSquare;
    }

    public void setPlantsPerSquare(java.math.BigDecimal plantsPerSquare) {
        this.plantsPerSquare = plantsPerSquare;
    }

    public java.math.BigDecimal getPrice() {
        return price;
    }

    public void setPrice(java.math.BigDecimal price) {
        this.price = price;
    }

    public java.math.BigDecimal getWeight() {
        return weight;
    }

    public void setWeight(java.math.BigDecimal weight) {
        this.weight = weight;
    }

}

我还尝试解决添加此依赖项的问题：

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
</dependency>

---

请删除对

应用程序.properties

中自动配置的排除，并添加hibernate方言，即更新

应用程序.properties

，如下所示：

spring.datasource.url=jdbc:mysql://localhost:3306/garden
spring.datasource.username=root
spring.datasource.password=admin
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.jpa.hibernate.ddl-auto=create
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect

此外，您还可以将应用程序简化为

package com.garden.garden;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@SpringBootApplication
@EnableJpaRepositories
@EntityScan
public class GardenApplication {

  public static void main(String[] args) {
    SpringApplication.run(GardenApplication.class, args);
  }

}

并从pom中删除tomcat依赖项（它随

SpringBootStarterWeb

传递而来）。

---

此外，在依赖项中有lombok，您可以使用

@Data

注释

蔬菜

，并删除getter、setter和构造函数。

这通常发生在您无权访问数据库时。您能检查一下您是否可以使用application.properties中提供的内容访问MySql数据库吗？您是对的。我没有在连接url中包含时区。在开始时，我添加了这个属性spring.jpa.database platform=org.hibernate.dialent.mysqldialent来解决这个问题。spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration是导致这个问题的原因。我之所以添加这个，是因为我在另一篇文章中读到，我解决了mysql服务器时区的错误。无需对此进行详细说明，我在其他帖子中读到，如果添加此属性，则必须指定mysql版本：

spring.datasource.url=jdbc:mysql://localhost:3306/garden
spring.datasource.username=root
spring.datasource.password=admin
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.jpa.hibernate.ddl-auto=create
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect

package com.garden.garden;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@SpringBootApplication
@EnableJpaRepositories
@EntityScan
public class GardenApplication {

  public static void main(String[] args) {
    SpringApplication.run(GardenApplication.class, args);
  }

}