Java Spring 引导：考虑在配置中定义一个名为“entityManagerFactory”的bean

Question

我正在使用 Java Spring 启动一个基本应用程序，我遇到了这个错误：

这是错误消息：

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")); }

   }

2. UserRepository class 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-plugin

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？ 任何解决方案？

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

我只是评论它并解决了问题。

得到教训：

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