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记录日常开发中,springboot 3 集成mubatisPlus,项目编译无报错,启动报错:Bean named ‘ddlApplicationRunner’ is expected to be of type ‘org.springframework.boot.Runner’ but was actually of type ‘org.springframework.beans.factory.support.NullBean’ 有效解决方案。
报错内容:
org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'ddlApplicationRunner' is expected to be of type 'org.springframework.boot.Runner' but was actually of type 'org.springframework.beans.factory.support.NullBean'
at org.springframework.beans.factory.support.AbstractBeanFactory.adaptBeanInstance(AbstractBeanFactory.java:410) ~[spring-beans-6.1.2.jar:6.1.2]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:391) ~[spring-beans-6.1.2.jar:6.1.2]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204) ~[spring-beans-6.1.2.jar:6.1.2]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:778) ~[spring-boot-3.2.1.jar:3.2.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:341) ~[spring-boot-3.2.1.jar:3.2.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1358) ~[spring-boot-3.2.1.jar:3.2.1]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1347) ~[spring-boot-3.2.1.jar:3.2.1]
at com.hqwy.service.SpringbootApplication.main(SpringbootApplication.java:13) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) ~[spring-boot-devtools-3.2.1.jar:3.2.1]
亲测有效解决方案:
- 修改Mybatis-Plus的依赖坐标
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-spring-boot3-starter</artifactId>
<version>3.5.5</version>
<exclusions>
<exclusion>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- mybatis-plus 所需依赖 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
</dependency>
亲测第二种有效解决方案:
本着缺什么就补什么的原则,将缺少的Bean对象注入到容器中。
import com.baomidou.mybatisplus.autoconfigure.DdlApplicationRunner;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import java.util.List;
/**
* @author Edwin
* @version 1.0.0
*/
@Component
public class GlobalConfig {
@Bean
public DdlApplicationRunner ddlApplicationRunner(@Autowired(required = false) List ddlLrist) {
return new DdlApplicationRunner(ddlLrist);
}
}
end 到此!问题完美解决,这个问题困扰了我好几天… 苦苦寻觅到的解决方式。
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