Spring 引導 - 存儲庫字段需要一個名為“entityManagerFactory”的 bean，但找不到

Question

我正在開發 Spring Boot 應用程序，並在啟動服務器時遇到此錯誤。 我不確定我是否錯誤地定義了任何注釋或缺少任何依賴項。 任何幫助，將不勝感激。

總機 class：

@SpringBootApplication
public class FantasyManagerApplication {

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

聯賽服務.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>

錯誤：

***************************
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.

Answer 1

spring-boot-starter-data-jpa將引入您需要的所有休眠依賴項。 使用 spring 啟動版本 1.5.1，它將拉入hibernate-core:5.0.11和hibernate-entitymanager:5.0.11 。 除了不必要之外，您的休眠依賴項版本不匹配，我猜這是導致錯誤的原因。

嘗試從 pom.xml 中刪除這些依賴項。

<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>

Answer 2

試試這些依賴

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

代替：

<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>

Answer 3

Hibernate-core 5.2.0 在處理收集時存在 Spring Data JPA 問題。 當您使用 Spring Data JPA 時，Hibernate-core 5.2.1 及更高版本適用於 Spring Data JPA。

從休眠 5.2.0 開始。 不再需要 hibernate-entitymanager。

所以嘗試改變：

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

到這個版本：

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

這為我修好了。

Answer 4

問題可能是由於版本不匹配。 問題可以通過指定這樣的依賴來解決（因為沒有提到版本，它是自動管理的）

    <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>

Answer 5

嘗試從

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

並通過 IDE 的更新依賴項功能或通過從項目文件夾運行mvn install進一步更新項目依賴項。

Answer 6

我又遇到了這個問題。 我所做的是改變 pom 依賴。

來自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>

沒有額外的休眠相關依賴。

Answer 7

對於那些有兩個數據源的人，只需在其中一個數據源上添加@Primary。