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創建類路徑資源中定義的名為“entityManagerFactory”的 bean 時出錯

創建類路徑資源中定義的名為“entityManagerFactory”的 bean 時出錯

慕少森 2023-03-17 15:31:48
當我嘗試使用 hibernate 和 MySql 運行我的 spring-boot 項目時，出現錯誤。我的應用程序.propertiesspring.datasource.url = jdbc:mysql://localhost:3306/spring-mysql?useSSL=falsespring.datasource.username = rootspring.datasource.password = spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialectspring.jpa.hibernate.ddl-auto = update在 pom.xml 中，我有以下依賴項，<parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.6.RELEASE</version>        <relativePath /> <!-- lookup parent from repository -->    </parent>    <properties>        <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-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <scope>runtime</scope>        </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>    </dependencies>我還提到了以前關于此問題的問題（創建名為“entityManagerFactory”的 bean 在類路徑資源中定義的錯誤：調用 init 方法失?。?，但沒有任何幫助。完整的代碼庫可在https://github.com/tenusha/application-frameworks/tree/master/spring-boot-mysql
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6 回答

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holdtom

TA貢獻1805條經驗 獲得超10個贊

您使用了錯誤包中的 @Id 注釋：

import org.springframework.data.annotation.Id;

它一定要是：

 import javax.persistence.Id;


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?
茅侃侃

TA貢獻1842條經驗 獲得超22個贊

添加@Id annotation所有模態類(Course, Subject) 確保導入的包是import javax.persistence.Id；



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料青山看我應如是

TA貢獻1772條經驗 獲得超8個贊

前幾天我收到錯誤消息，比如需要一個名為“entityManagerFactory”的 bean，但找不到。


經過大量谷歌搜索解決了這個問題。我為 JPA 設置了手動配置。


@Bean 

public LocalSessionFactoryBean sessionFactory() {

    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean(); 


    return sessionFactory;

}

但 JPA 默認按名稱“entityManagerFactory”搜索 sessionFactory，因此將我的代碼更改為：


@Bean(name="entityManagerFactory")

public LocalSessionFactoryBean sessionFactory() {

    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();


    return sessionFactory;

} 

我之前的回答

更新 導入正確的類


import javax.persistence.Id;


您嘗試在沒有外鍵參考的情況下加入學科課程...根據該圖像更改您的代碼

http://img1.sycdn.imooc.com//641417ce0001e04402210077.jpg

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ibeautiful

TA貢獻1993條經驗 獲得超6個贊

我遇到了同樣的問題，我通過將版本添加到 pom.xml 中的 javax persistence api 來修復它，更改它：


    <dependency>

        <groupId>javax.persistence</groupId>

        <artifactId>javax.persistence-api</artifactId>

    </dependency>

為此：


    <dependency>

        <groupId>javax.persistence</groupId>

        <artifactId>javax.persistence-api</artifactId>

        <version>2.2</version>

    </dependency>


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慕容708150

TA貢獻1831條經驗 獲得超4個贊

添加@EntityScan(basePackages = "io.summer")到您的應用程序類。這是休眠掃描您的實體所必需的。（為我工作，為 postgresql）


package com.sliit.af;


import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.data.jpa.repository.config.EnableJpaAuditing;


@SpringBootApplication

@EnableJpaAuditing

@EntityScan(basePackages = "com.sliit.af")       /* ADDED HERE */

public class SpringBootMysqlApplication {


    public static void main(String[] args) {

        SpringApplication.run(SpringBootMysqlApplication.class, args);

    }


}


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開滿天機

TA貢獻1786條經驗 獲得超13個贊

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>


    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.3.1.RELEASE</version>

        <relativePath />

        <!-- lookup parent from repository -->

    </parent>


    <groupId>com.revature</groupId>

    <artifactId>restful-web-services</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>RestfulWebServices</name>

    <description>Restful Web Services project for Spring Boot</description>


    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

        <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>

    </properties>


    <dependencies>


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-data-jpa</artifactId>

            <version>2.3.3.RELEASE</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa -->


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-jdbc -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-jdbc</artifactId>

            <version>2.3.3.RELEASE</version>

        </dependency>


        <dependency>

            <groupId>com.h2database</groupId>

            <artifactId>h2</artifactId>

            <scope>runtime</scope>

        </dependency>


        <dependency>

            <groupId>org.postgresql</groupId>

            <artifactId>postgresql</artifactId>

            <version>42.2.5</version>

        </dependency>


        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-api</artifactId>

            <version>1.7.25</version>

        </dependency>



        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> 

            </dependency> -->

        <!-- START AND STOP THE APPLICATION AFTER MAKING THE CHANGE! -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-validation</artifactId>

        </dependency>


        <!--<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> 

            </dependency> -->


        <!-- provides information concerning the health metrics etc. of applicaiton -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>


        <!-- provides view of data and consumes info from actuator -->

        <dependency>

            <groupId>org.springframework.data</groupId>

            <artifactId>spring-data-rest-hal-browser</artifactId>

        </dependency>



        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-hateoas</artifactId>

        </dependency>


        <dependency>

            <groupId>com.fasterxml.jackson.dataformat</groupId>

            <artifactId>jackson-dataformat-xml</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.maven.plugin-tools/maven-plugin-annotations -->


        <dependency>

            <groupId>io.springfox</groupId>

            <artifactId>springfox-boot-starter</artifactId>

            <version>3.0.0</version>

        </dependency>


        <dependency>

            <groupId>io.springfox</groupId>

            <artifactId>springfox-boot-starter</artifactId>

            <version>3.0.0</version>

        </dependency>

        <!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> 

            </dependency> -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

        </dependency>


        <dependency>

            <groupId>javax.xml.bind</groupId>

            <artifactId>jaxb-api</artifactId>

            <version>2.3.0</version>

        </dependency>




        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.9</version>

        </dependency>



        <dependency>

            <groupId>org.mockito</groupId>

            <artifactId>mockito-core</artifactId>

            <version>1.9.5</version>

            <scope>test</scope>

        </dependency>


        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>



    </dependencies>


    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>


    <repositories>

        <repository>

            <id>spring-snapshots</id>

            <name>Spring Snapshots</name>

            <url>https://repo.spring.io/snapshot</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>jfrog-snapshots</id>

            <name>JFROG Snapshots</name>

            <url>http://oss.jfrog.org/artifactory/oss-snapshot-local</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </repository>

    </repositories>


    <pluginRepositories>

        <pluginRepository>

            <id>spring-snapshots</id>

            <name>Spring Snapshots</name>

            <url>https://repo.spring.io/snapshot</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </pluginRepository>

        <pluginRepository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </pluginRepository>

    </pluginRepositories>


</project>


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