SpringBoot异常No runnable methods，is unlikely to start due to ，failed to parse configuration class修改

异常一：

java.lang.Exception: No runnable methods

解决方案： SpringBoot的测试类执行方法上加@Test

异常二：

Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.

解决方案：在测试类上添加@SpringBootTest（classes = springboot主执行类的类名.class）

异常三：

** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class

解决方案： springboot的主执行类不能直接放在src/main/java下