Java Spring 引导：考虑在您的配置中定义一个名为 'entityManagerFactory' 的 bean

Question

我正在使用 Java Spring Boot 开发一个基本应用程序，我遇到了这个错误：

这是错误信息：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-12-16 12:44:40.321 ERROR 5698 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
***************************
APPLICATION FAILED TO START
***************************
Description:
Field userRepository in com.htamayo.sbcrashcourse.SbcrashcourseApplication required a bean named 'entityManagerFactory' that could not be found.
The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean named 'entityManagerFactory' in your configuration.

我的主要 class 看起来像这样：

 package com.htamayo.sbcrashcourse;

 import com.htamayo.sbcrashcourse.lendingengine.domain.model.User;
 import com.htamayo.sbcrashcourse.lendingengine.domain.repository.UserRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

 @SpringBootApplication
 @ComponentScan(basePackages = {"com.htamayo.sbcrashcourse.lendingengine"})
 @EnableJpaRepositories("com.htamayo.sbcrashcourse.lendingengine.domain.repository")
 public class SbcrashcourseApplication implements CommandLineRunner {

 @Autowired
 private UserRepository userRepository;

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

 @Override
 public void run(String... args) throws Exception {
     userRepository.save(new User(1, "John", "B", 27, "Software Developer"));
     userRepository.save(new User(2, "Peter", "C", 21, "Pilot"));
     userRepository.save(new User(3, "Henry", "E", 21, "Unemployed"));
 }

}

UserRepository class是这个：

package com.htamayo.sbcrashcourse.lendingengine.domain.repository;

 import com.htamayo.sbcrashcourse.lendingengine.domain.model.User;
 import org.springframework.data.jpa.repository.JpaRepository;

 public interface UserRepository extends JpaRepository<User, Long> {

 }

我的 pom.xml 看起来像这样：

 <dependencies>
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-actuator</artifactId>
 </dependency>
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-data-jpa</artifactId>
 </dependency>
 <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-orm</artifactId>
 </dependency>
 <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-core</artifactId>
     <version>5.4.32.Final</version>
 </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.springframework.boot</groupId>
     <artifactId>spring-boot-starter-test</artifactId>
     <scope>test</scope>
 </dependency>
 <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-web</artifactId>
     <version>5.3.9</version>
 </dependency>
 <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-webmvc</artifactId>
     <version>5.3.9</version>
 </dependency>
 <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-core</artifactId>
     <version>5.5.7.Final</version>
 </dependency>
 <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-entitymanager</artifactId>
     <version>5.5.7.Final</version>
 </dependency>
 <dependency>
     <groupId>javax.xml.bind</groupId>
     <artifactId>jaxb-api</artifactId>
     <version>2.3.1</version>
 </dependency>

org.springframework.boot spring-boot-maven-插件

我一直在 Google 上寻找解决方案，但到目前为止一无所获，所以我的问题是：我不明白如何克服 EntityManagerFactory 错误，我是否缺少依赖项？还是应该重构我的代码？有什么解决办法吗？

非常感谢您的建议。

Answer 1

好吧，17天后我终于得到了解决方案：

我的问题出在属性文件上，出于某种原因我使用了这一行（我不记得为什么）： spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration

我刚刚评论了它，问题就解决了。

经验教训：

始终记录您的代码
JitterTed 的 discord 是一个很好的答案来源。

Java Spring 引导：考虑在您的配置中定义一个名为 'entityManagerFactory' 的 bean

Java Spring Boot: Consider defining a bean named 'entityManagerFactory' in your configuration

java

spring

spring-mvc

spring-boot