Java 无法将MySQL数据库连接到我的spring项目（尽管我读了所有文章）

我正在用GoogleAPI和SpringBoot构建一个小应用程序，我需要将mysql数据库连接到我的项目

第一：我所有的包都在同一个地方（为了避免这种问题） 因此，我首先通过克隆项目来尝试docexample（） 以及它的返回值：未能获得JDBC连接

我尝试使用自己的应用程序，得到以下结果： 创建在+中定义的名为“entityManagerFactory”的bean时出错，也无法获取JDBC连接

application.properties
spring.jpa.hibernate.ddl-auto=none
spring.datasource.url=jdbc:mysql://localhost:8181/testuser
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.properties.hibernate.dialect = 
org.hibernate.dialect.MySQL5Dialect
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

dependencies :
<?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>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.devoteam.presales</groupId>
<artifactId>testspringsecu</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>testspringsecu</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>11</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.thymeleaf</groupId>
        <artifactId>thymeleaf</artifactId>
        <version>3.0.11.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>5.2.3.Final</version>
    </dependency>
    <dependency>
        <groupId>com.google.oauth-client</groupId>
        <artifactId>google-oauth-client</artifactId>
        <version>1.27.0</version>
    </dependency>
    <dependency>
        <groupId>org.thymeleaf</groupId>
        <artifactId>thymeleaf-spring5</artifactId>
        <version>3.0.11.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.security.oauth.boot</groupId>
        <artifactId>spring-security-oauth2-autoconfigure</artifactId>
        <version>2.1.2.RELEASE</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-web-services</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>js-cookie</artifactId>
        <version>2.1.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.api-client</groupId>
        <artifactId>google-api-client</artifactId>
        <version>1.23.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.oauth-client</groupId>
        <artifactId>google-oauth-client-jetty</artifactId>
        <version>1.23.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.apis</groupId>
        <artifactId>google-api-services-sheets</artifactId>
        <version>v4-rev493-1.23.0</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>com.vaadin.external.google</groupId>
        <artifactId>android-json</artifactId>
        <version>0.0.20131108.vaadin1</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </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>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>

存储库：

package com.devoteam.presales.testspringsecu;

import com.devoteam.presales.testspringsecu.UsersDevo;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UsersRepo extends CrudRepository<UsersDevo, Long> {

}

我还尝试了一些注释

编辑：我用文档示例解决了这个问题：spring.datasource.url=jdbc:mysql://localhost:8181/testuser?serverTimezone=EST5EDT 但我仍然有：rg.springframework.beans.factory.BeanCreationException:创建名为“entityManagerFactory”的bean时出错 通过我的应用程序，我做到了（在Loooog调查之后）

答案（对于像我这样的noob）是，您的实体必须与您的表完全相同。 我的错误是忘记了@Id @私有整数ID上的GeneratedValue（strategy=GenerationType.AUTO）。 春天有时会很痛苦。。。（经常……）

别忘了？serverTimezone=EST5EDT在数据库url之后

---

我希望能为某人节省一些时间。

你能发布

SpringBootServletInitializer

类吗？“testuser”听起来像个用户名。它也是您尝试连接到的数据库的名称吗？因为这是JDBC URL中所期望的。您的mysql服务器是否确实在本地主机上运行，并提供端口8181？用户root的数据库密码是否真的是“root”，和/或您是否在实际配置中指定了有效的数据库用户名和密码？您使用的是哪一版本的Connector/J？您正在指定版本8提供的驱动程序类的名称，但该名称与早期版本中适用的名称不同。连接器/J是否在类路径中？您的类路径中是否有不止一个版本？

package com.devoteam.presales.testspringsecu;

import com.devoteam.presales.testspringsecu.UsersDevo;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UsersRepo extends CrudRepository<UsersDevo, Long> {

}

package com.devoteam.presales.testspringsecu;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller

@RequestMapping(path = "/demo")
public class TestController   {
@Autowired
UsersRepo usersRepo;

@GetMapping(path = "/all")
public @ResponseBody Iterable<UsersDevo> getAllUsers() {
    return usersRepo.findAll();
}

}

package com.devoteam.presales.testspringsecu;

import java.security.Principal;
import java.util.*;

import org.json.JSONException;
import org.json.JSONObject;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;


@SpringBootApplication
@RestController
public class TestspringsecuApplication {


@RequestMapping("/user")
public Principal user(Model model, Principal principal) throws 
JSONException {
    OAuth2Authentication authentication = (OAuth2Authentication) 
principal;

    return principal;
}


@GetMapping("/user")
public ModelAndView method() {
    System.out.println("icila");
    return new ModelAndView("redirect:" + "/");
}

public static void main(String[] args) {

    SpringApplication.run(TestspringsecuApplication.class, args);

  }

}