Question

我正在尝试从我的Spring Boot应用程序连接到mySQL数据库。但是，当我尝试运行它时显示错误。

我该如何解决？

错误

Future

从文件中添加代码段

pom.xml

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory

application.properties

<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>
  <groupId>io.nkamanoo.springboot</groupId>
  <artifactId>course-api</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>Java Brains Course API</name>



<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
</parent>

<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>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
            <version>8.0.19</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
</dependencies>


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

 </project>

堆栈跟踪

spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=root
spring.datasource.password=root

spring.jpa.hibernate.use-new-id-generator-mappings=false
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

我还没有在sql中手动创建表，因为我认为spring.jpa.hibernate.ddl-auto = update应该这样做

Answer 1

这可能与错误的@annotations有关。发布您的实体类以重新检查。无论如何，请在属性文件中添加以下行：

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

无法从SpringBoot连接到MySQL数据库

1 个答案: