Question

春季启动入门课程

package com.test;

@SpringBootApplication(exclude={
DataSourceAutoConfiguration.class,
DataSourceTransactionManagerAutoConfiguration.class})
public class AssetManagementDigital2Application {

    public static void main(String[] args) {
        SpringApplication.run(AssetManagementDigital2Application.class, args);
    }
}

控制器类

package com.test.assetmanagementdigital.controller;

 @RestController

public class ShopController {

    @Autowired
    private ShopServiceImpl shopServiceImpl;

    @RequestMapping(value="/shops",method=RequestMethod.POST)
    public void shopDetails(Shop shop){
        shopServiceImpl.addShopDetails(shop);

    }

}

实体

package com.test.assetmanagementdigital.model;

import javax.persistence.Entity;
import javax.persistence.Table;

@Entity
@Table(name="ShopDetails")
public class Shop {

    private String shopName;
    private Address address;

    public String getShopName() {
        return shopName;
    }

    public void setShopName(String shopName) {
        this.shopName = shopName;
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }


}

数据jpa存储库界面

package com.test.assetmanagementdigital.repository;
    @Repository
    public interface ShopRepository extends CrudRepository<Shop,Long>{

    }

服务类

package com.test.assetmanagementdigital.service;
@Service
public class ShopServiceImpl {

    @Autowired
    private ShopRepository shopRepository;

    public void addShopDetails(Shop shop) {
        shopRepository.save(shop);
    }

}

gradle文件

 buildscript {
        ext {
            springBootVersion = '2.0.0.BUILD-SNAPSHOT'
        }
        repositories {
            mavenCentral()
            maven { url "https://repo.spring.io/snapshot" }
            maven { url "https://repo.spring.io/milestone" }
        }
        dependencies {
            classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
        }
    }

    apply plugin: 'java'
    apply plugin: 'eclipse-wtp'
    apply plugin: 'org.springframework.boot'
    apply plugin: 'io.spring.dependency-management'
    apply plugin: 'war'

    version = '0.0.1-SNAPSHOT'
    sourceCompatibility = 1.8

    repositories {
        mavenCentral()
        maven { url "https://repo.spring.io/snapshot" }
        maven { url "https://repo.spring.io/milestone" }
    }

    configurations {
        providedRuntime
    }

    dependencies {
        compile('org.springframework.boot:spring-boot-starter-data-jpa')
        compile('org.springframework.boot:spring-boot-starter-web')
        compile("com.h2database:h2")
        compile group: 'org.hibernate', name: 'hibernate-core', version: '4.2.2.Final'
        providedRuntime('org.springframework.boot:spring-boot-starter-tomcat')
        testCompile('org.springframework.boot:spring-boot-starter-test')
    }

我收到以下错误

Description:

Field shopRepository in com.test.assetmanagementdigital.service.ShopServiceImpl required a bean of type 'com.test.assetmanagementdigital.repository.ShopRepository' that could not be found.

Action:

Consider defining a bean of type 'com.test.assetmanagementdigital.repository.ShopRepository' in your configuration.

如果我从@Autowired删除ShopRepository注释，那么它将抛出`NullPointerException

我在这里试过@EnableJpaRepositories("com.test.assetmanagementdigital.repository")

org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'shopController': Unsatisfied dependency expressed through field 'shopServiceImpl'; nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'shopServiceImpl': Unsatisfied dependency expressed through field 'shopRepository'; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'shopRepository': Post-processing of merged bean definition failed; nested exception is 
java.lang.NoSuchMethodError: javax.persistence.PersistenceContext.synchronization()Ljavax/persistence/SynchronizationType;

Answer 1

您的Spring配置不正确。

spring-boot-starter-data-jpa已经提供hibernate-core依赖关系。当您使用特定版本声明它时：

compile group: 'org.hibernate', name: 'hibernate-core', version: '4.2.2.Final'

您不必再次声明它，因为您的指定版本可能不同并且与启动器提供的版本不兼容。
并且根据您的错误，似乎是这种情况，因为在运行时找不到javax.persistence.PersistenceContext.synchronization()方法。

合并bean定义的后处理失败;嵌套异常是 java.lang.NoSuchMethodError： javax.persistence.PersistenceContext.synchronization()Ljavax/persistence/SynchronizationType;

只需删除hibernate-core依赖关系即可。它

Answer 2

您需要使用@EnableJpaRepositories注释向Spring提供软件包名称以扫描存储库，例如：

@SpringBootApplication
@EnableJpaRepositories("com.test.assetmanagementdigital.repository")
public class AssetManagementDigital2Application

Here's文档。

Spring数据jpa存储库注入失败，在Spring启动时使用@Autowired

2 个答案: