springboot 取消starter的自动注入
starer是spring boot中一个很重要的概念,starter相当于一个模块,它能将所需要的的依赖整合在一起并对模块内的bean自动装配到spring IOC容器,使用者只需要在maven中依赖相应的starter包并无需做过多的依赖即可进行开发。
看例子
比如,我们导入了mybatis相关的依赖,但是我可能暂时没用到数据库,所以就没有做数据库相关的配置,这时候项目就会无法启动
2020-03-08 22:13:10.396 WARN 10692 --- [ main] ConfigServletWebServerApplicationContext : 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$Hikari.class]: Bean instantiation via factory method failed;
nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate
[com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception;
nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
因为springboot中默认的数据库连接池是hikari,你没有在application.properties里面进行数据库相关的配置的话,那么就会无法自动装载dataSource
Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]
重点来了
如何取消相关starer的自动注入?
我们还是以数据库的这个为例子:
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
那么,就需要在启动类加上如上配置,取消DataSourceAutoConfiguration的自动注入
springbootApplication是一个组合注解,其实里面真正实现自动注入功能的,是这个EnableAutoConfiguration注解
SpringBoot 自动注入问题
Description:
Field service in com.test.controller.UserController required a bean of type 'com.test.service.UserService' that could not be found.
Action:
Consider defining a bean of type 'com.test.service.UserService' in your configuration.
项目启动的时候出现出现问题
run
controller
service
dao
配置文件如下
项目目录
找了几个类,该注解的也注解了。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq_29914229/article/details/104742294