SpringBoot项目取消数据库配置

Posted 2023-01-11 killer-leon

spring boot启动报错：

springboot项目启动时，如果没有配置数据库配置，启动时会抛出如下异常。

2018-06-04 11:18:39.153  INFO 2660 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-06-04 11:18:39.435  WARN 2660 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. 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).
2018-06-04 11:18:39.441  INFO 2660 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-06-04 11:18:39.444 ERROR 2660 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

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).

2. 原因

@SpringBootApplication = (默认属性)@Configuration + @EnableAutoConfiguration + @ComponentScan。springboot会自动注入数据源，而你却没有配，所以他就抛出该异常。

3. 如何不配

如果你只是简单的想建个项目，并不需要数据库支持，那么你可以让他不去注入数据源。

// 一般你启动springboot项目，都会写一个有@SpringBootApplication注解的类
// 你在这个注解中添加exclude=DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class
// 即可无数据库运行

@SpringBootApplication(exclude=DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class)