一、报错信息

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class

Action:

Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

Disconnected from the target VM, address: '127.0.0.1:55374', transport: 'socket'

Process finished with exit code 1

二、原因分析

1. 在pom中引入了mybatis-spring-boot-starter ，
2. Spring boot默认会加载org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration类，
3. DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean。
4. 因为工程中没有关于dataSource相关的配置信息，当spring创建dataSource bean因缺少相关的信息就会报错。

三 、解决方法

在Spring boot的启动引导类上增加@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})，阻止Spring boot自动注入dataSource

@SpringBootApplication
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
public class TestApplication {
	public static void main(String[] args) {
		SpringApplication.run(TestApplication .class, args);
	}
}