Java 创建名为'；实体管理工厂&x27；在类路径资源中定义-调用init方法失败

我一直在运行我的Spring Boot项目，试图使用Spring数据JPA连接到MySQL，遇到同样的问题。它说了一些关于“init方法调用失败；嵌套异常是org.hibernate.service.spi.ServiceException:无法创建请求的服务[org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]”。不知道那是什么意思。尝试查看此处的其他已回答问题，但无法找到答案。有什么想法吗

错误是：

org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'entityManagerFactory' defined in class path 
resource[org/springframework/boot/autoconfigure/orm/jpa/
HibernateJpaAutoConfigura ion.class]: Invocation of init method failed; nested 
exception is 
org.hibernate.service.spi.ServiceException: Unable to create requested service 
[org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

原因是：

Caused by: org.hibernate.service.spi.ServiceException: Unable to create 
requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo 
cannot be null when 'hibernate.dialect' not set

我的pom.xml文件是：

 <?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>

<name></name>
<description>project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.4.RELEASE</version>
    <relativePath/>
</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-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>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
    </dependency>
</dependencies>

4.0.0
springboot项目
org.springframework.boot
spring启动程序父级
1.5.4.1发布
UTF-8
UTF-8
1.8
org.springframework.boot
spring引导启动器数据jpa
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
弹簧靴开发工具
运行时
mysql
mysql连接器java
运行时
org.springframework.boot
弹簧起动试验
测试
javax.servlet
jstl
org.apache.tomcat.embed
汤姆卡特·贾斯珀

另外，我的application.properties：

spring.datasource.url=jdbc:mysql://localhost:3306/<<projectname>>
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=update

spring.mvc.view.prefix=/WEB-INF/
spring.mvc.view.suffix=.jsp

spring.datasource.url=jdbc:mysql://localhost:3306/
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver类名=com.mysql.jdbc.driver
spring.jpa.hibernate.ddl auto=update
spring.mvc.view.prefix=/WEB-INF/
spring.mvc.view.suffix=.jsp

如果仔细查看日志，它会显示：

Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo 
cannot be null when 'hibernate.dialect' not set

因此，您需要在

应用程序.properties

文件中再添加一行来设置MySQL方言：

spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect

---

如果仔细查看日志，它会显示：

Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo 
cannot be null when 'hibernate.dialect' not set

因此，您需要在

应用程序.properties

文件中再添加一行来设置MySQL方言：

spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect

---

你能提供完整的StackTrace吗？你能提供完整的StackTrace准备好了吗？已经检查好了吗？