cloud 启动报错：If you want an embedded database please put a supported one on the classpath

原因：在父pom中引入了jdbc和mysql相关依赖，如下：

        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.16</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

启动不需要连接数据库的子项目，就会报这个错：

Description:

Cannot determine embedded database driver class for database type NONE

Action:

If you want an embedded database please put a supported one on the classpath.
If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).
 

解决办法：在启动类的@EnableAutoConfiguration或@SpringBootApplication中添加exclude = {DataSourceAutoConfiguration.class}，排除此类的autoconfig。启动以后就可以正常运行。排除数据库的自动启动；如下

//@SpringBootApplication
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class}) //因在父项目的pom中添加了连接数据库相关的pom，所以每一个不需要连接数据库的子项目都需要加这个
@EnableEurekaServer
public class EurekaServerApplication {

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