将Spring-Boot连接到MySQL

Question

我是使用Spring Boot的新手，将它连接到MySQL数据库时出错，我已经阅读了所有教程，但仍然没有发现问题。

错误27341-[[main] com.zaxxer.hikari.pool.HikariPool
：HikariPool-1-池初始化期间发生异常。 com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException：无法创建与数据库服务器的连接。 org.springframework.jdbc.support.MetaDataAccessException：无法获取提取元数据的连接； 嵌套的异常是org.springframework.jdbc.CannotGetJdbcConnectionException：无法获取JDBC连接。 嵌套的异常是com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException：无法创建与数据库服务器的连接。 在org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData（JdbcUtils.java:328）〜[spring-jdbc-5.1.5.RELEASE.jar：5.1.5.RELEASE]

application.properties

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/db_predio?useSSL=false
spring.datasource.username = root
spring.datasource.password = 

spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1

spring.jpa.show-sql = true

spring.jpa.hibernate.ddl-auto = update

spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

的pom.xml

    <dependencies>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-autoconfigure -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>2.1.5.RELEASE</version>
        </dependency>

        <!-- 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>2.1.3.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.39</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.3</version>
            <scope>provided</scope>
        </dependency>


    </dependencies>

    <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>11</source>
                <target>11</target>
            </configuration>
        </plugin>
    </plugins>
    </build>
</project>

运行应用程序

@SpringBootApplication
@EntityScan("au.basicexpert.predio.entity")
@EnableJpaRepositories("au.basicexpert.predio.repository")
@ComponentScan("au.basicexpert.predio.controller")
public class Application {

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

Answer 1

关闭本地MySQL，然后在启用调试的情况下再次运行项目。 请发布完整的日志跟踪。

为什么要使用旧版本的MySQL连接器？ 除非背后有特殊原因，否则请始终选择新版本。 如果您不确定什么是最新版本，请删除该版本，并让maven首次对其进行管理。