【问题标题】：Spring Boot - repository field required a bean named 'entityManagerFactory' that could not be foundSpring Boot - 存储库字段需要一个名为“entityManagerFactory”的 bean，但无法找到
【发布时间】：2017-06-30 03:53:00
【问题描述】：

我正在开发一个 Spring Boot 应用程序，在启动服务器时遇到了这个错误。我不确定我是否错误地定义了任何注释或缺少任何依赖项。任何帮助将不胜感激。

主类：

@SpringBootApplication
public class FantasyManagerApplication {

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

LeagueService.java：

@Service
public class LeagueService {

    @Autowired
    private LeagueRepository leagueRepository;
    @Autowired
    private PlayerRepository playerRepository;
    @Autowired
    private TeamRepository teamRepository;

    /**
     * Returns a list of all the leagues in the database 
     * @return List<League>
     */
    public List<League> getAllLeagues(){
        List<League> leagues = new ArrayList<>();
        leagueRepository.findAll()
        .forEach(leagues::add);
        return leagues;
    }

    /**
     * Find details for a particular League
     * @param leagueId
     * @return League
     */
    public League getLeagueById(long leagueId){
        return leagueRepository.findOne(leagueId);
    }

    /**
     * Find the leagueSettings for a particular League  
     * @param leagueId
     * @return LeagueSettings
     */
    public LeagueSettings getLeagueSettingsById(long leagueId){
        return leagueRepository.findOne(leagueId).getLeagueSettings();
    }


    /**
     * Returns a list of all the Team's in the League
     * @param leagueId
     * @return List<Team>
     */
    public List<Team> getTeamsInLeague(long leagueId){
        List<Team> teams = new ArrayList<>();
        leagueRepository.findOne(leagueId).getTeams()
        .forEach(teams::add);
        return teams;

    }

    /**
     * Returns a list of all the Player's in the League
     * @param leagueId
     * @return List<Player>
     */
    public List<Player> getPlayersInLeague(long leagueId){
        List<Player> players = new ArrayList<>();
        leagueRepository.findOne(leagueId).getPlayers()
        .forEach(players::add);
        return players;     
    }

    /**
     * Returns a list of all the User's in the League
     * @param leagueId
     * @return List<User>
     */
    public List<User> getUsersInLeague(long leagueId){
        List<User> users = new ArrayList<>();
        leagueRepository.findOne(leagueId).getUsers()
        .forEach(users::add);
        return users;       
    }


    /**
     * Add League to database
     * @param league
     */
    public void addLeague(League league){
        leagueRepository.save(league);
    }

    /**
     * Assign LeagueSettings for a League
     * @param userId
     * @param leagueSettings
     */
    public void assignLeagueSettings(long leagueId, LeagueSettings leagueSettings){
        League league = leagueRepository.findOne(leagueId);
        league.setLeagueSettings(leagueSettings);
        leagueRepository.save(league);  
    }

    /**
     * Assign a Player to a League and vice versa
     * @param leagueId
     * @param playerId
     */
    public void assignPlayerToLeague(long leagueId, long playerId){
        //Find the league and player from the database
        League league = leagueRepository.findOne(leagueId);
        Player player = playerRepository.findOne(playerId);

        //Get the players that the league already has
        List<Player> players = new ArrayList<>();
        players = league.getPlayers();

        //Get the leagues that the player is part of
        List<League> leagues = new ArrayList<>();
        leagues = player.getLeagues();

        //Assign player to this league and vice versa
        leagues.add(league);
        players.add(player);
        league.setPlayers(players);
        player.setLeagues(leagues);

        //Update changes in database
        playerRepository.save(player);
        leagueRepository.save(league);
    }

    /**
     * Assign a Team to a League and vice versa
     * @param leagueId
     * @param teamId
     */
    public void assignTeamToLeague(long leagueId, long teamId){
        //Find the league and player from the database
        League league = leagueRepository.findOne(leagueId);
        Team team = teamRepository.findOne(teamId);

        //Get the teams that are already in the league
        List<Team> teams = new ArrayList<>();
        teams = league.getTeams();

        //Assign team to this league and vice versa
        teams.add(team);
        league.setTeams(teams);
        team.setLeague(league);

        //Update changes in database
        teamRepository.save(team);
        leagueRepository.save(league);
    }


    /**
     * Edit the details for a particular League
     * @param league
     */
    public void updateLeague(League league, long leagueId){
        leagueRepository.save(league);
    }


    /**
     * Delete the League from the database
     * @param leagueId
     */
    public void deleteLeague(long leagueId){
        leagueRepository.delete(leagueId);
    }

}

LeagueRepository.java

public interface LeagueRepository extends CrudRepository<League, Long> {

}

pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.dheeraj</groupId>
    <artifactId>fantasy-manager</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>fantasy-manager</name>
    <description>Fantasy Manager Application</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.1.4.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.2.3.Final</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

错误：

***************************
APPLICATION FAILED TO START
***************************

Description:

Field leagueRepository in com.dheeraj.service.LeagueService required a bean named 'entityManagerFactory' that could not be found.


Action:

Consider defining a bean named 'entityManagerFactory' in your configuration.

【问题讨论】：

看起来您没有运行 JPA 自动配置。确保你有启动器和数据库连接。
@chrylis - 如何让 JPA 自动配置运行？我已经在 application.properties 中建立了到 mysql 数据库的连接
您的 Hibernate 依赖项不匹配。只需删除版本号，让 Boot 管理它们。

标签： java sql rest spring-mvc spring-boot

【解决方案1】：

spring-boot-starter-data-jpa 将引入您需要的所有休眠依赖项。使用 Spring Boot 1.5.1 版，它将引入 hibernate-core:5.0.11 和 hibernate-entitymanager:5.0.11。除了不必要之外，您的休眠依赖版本不匹配，我猜这就是导致错误的原因。

尝试从您的 pom.xml 中删除这些依赖项。

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.1.4.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>5.2.3.Final</version>
</dependency>

【讨论】：

我有一个类似的错误，我自己也包含了hibernate。但是，根据mvn dependency:tree 我有spring-boot:jar:2.0.3. 和spring-boot-starter-data-jpa:2.0.3. 只包括hibernate-core 但不包括hibernate-entitymanager。
@NicCottrell Cottrell 我在使用 Spring Boot 2.0.3 时遇到了同样的问题。我想知道你是如何为自己修好的？
@NicCottrell ,@Ajay kumar ；我也遇到了同样的问题并尝试了所有可能的解决方案，但没有成功。请告诉我你是如何推进的？

【解决方案2】：

试试这些依赖项

  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-data-jpa</artifactId>
  </dependency>   
  <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
  </dependency>

而不是：

<dependency>
   <groupId>org.hibernate</groupId>
   <artifactId>hibernate-core</artifactId>
   <version>4.1.4.Final</version>
</dependency>
<dependency>
   <groupId>org.hibernate</groupId>
   <artifactId>hibernate-entitymanager</artifactId>
   <version>5.2.3.Final</version>
</dependency>

【讨论】：

【解决方案3】：

Hibernate-core 5.2.0 在处理收集时出现 Spring Data JPA 问题。当您使用 Spring Data JPA 时，Hibernate-core 5.2.1 及更高版本可以使用 Spring Data JPA。

从休眠 5.2.0 开始。不再需要休眠实体管理器。

所以尝试改变：

<dependency>
 <groupId>org.hibernate</groupId>
 <artifactId>hibernate-core</artifactId>
 <version>4.1.4.Final</version>
</dependency>

到这个版本：

<dependency>
 <groupId>org.hibernate</groupId>
 <artifactId>hibernate-core</artifactId>
 <version> 5.2.1.Final</version>
</dependency>

这为我解决了问题。

【讨论】：

【解决方案4】：

问题可能是由于版本不匹配。可以通过像这样指定依赖来解决问题（因为没有提到版本，所以它是自动管理的）

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</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-web</artifactId>
    </dependency>
</dependencies>

【讨论】：

【解决方案5】：

尝试从

中删除您的依赖项

~/.m2/repository (Linux)
C:/Users/your_user/.m2/repository (Windows)

并通过 IDE 的 update dependencies 功能或通过从项目文件夹运行 mvn install 进一步更新项目依赖项。

【讨论】：

【解决方案6】：

我又遇到了这个问题。我所做的是改变 pom 依赖。

来自 spring-data-jpa

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-data-jpa</artifactId>
</dependency>

到 spring-boot-starter-data-jpa

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

没有额外的休眠相关依赖。

【讨论】：