Java Spring Boot：考虑在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.

1. 我的主课是这样的：

    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"));
    }
   

   }

2. UserRepository 类是这样的：

   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> {
   
    }
   

3. 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

我一直在谷歌上寻找解决方案，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？还是我应该重构我的代码？有什么解决办法吗？

非常感谢您的建议。

Answer 1

嗯，17 天后我终于找到了解决方案：

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

我刚刚评论它并解决了问题。

经验教训：

1. 始终记录您的代码
2. JitterTed 的不和谐是很好的答案来源。