beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘bra

2023-11-20 18:49:10

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'brandServiceImpl': Unsatisfied dependency expressed through field 'brandMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.qingcheng.BrandMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:578)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:501)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:409)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:291)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.qingcheng.BrandMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1509)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)
	... 24 more

上面错误依赖注入出错了，不能生成类，我检查了mapper和service的对应代码–没错，最后controller的一个方法的注解不对，正确的如下：

Error creating bean with name 'multipartResolver' defined in URL [jar:file:/D:/soft/maven/repository

严重: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'multipartResolver': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.web.multipart.commons.CommonsMultipartResolver] from ClassLoader [WebappClassLoader
  context: 
  delegate: false
  repositories:
----------> Parent Classloader:
ClassRealm[plugin>org.apache.tomcat.maven:tomcat7-maven-plugin:2.2, parent: sun.misc.Launcher$AppClassLoader@18b4aac2

原因是视频说加入的applicationContext-config.xml，和正确的配置文件中不一样，改了就好哩。
还加入下面：

<bean id="ossClient" class="com.aliyun.oss.OSSClient">
	<constructor-arg index="0" value="oss-cn-beijing.aliyuncs.com"></constructor-arg>
	<constructor-arg index="1" value="AccessKeyID"></constructor-arg>
	<constructor-arg index="2" value="AccessKeySecret"></constructor-arg>
</bean>

<!--开启任务调度-->
<task:annotation-driven></task:annotation-driven>

加完要在pom.xml里添加对应依赖。就成功了

如果mysql数据库无法连接，检查版本和maven配置的jdbc一样吗，
参考学习：

https://blog.csdn.net/weixin_43770545/article/details/90486809

今天写东西测试的时候发现一个问题，如下：

application.yml中数据源是这样配置的：

第一反应就是记忆中连接mysql的驱动不都是com.mysql.jdbc.Driver吗？com.mysql.cj.jdbc.Driver是什么鬼？
后来查看了一下才知道这个跟驱动的依赖版本有关

 <dependency> 			
     <groupId>mysql</groupId> 			
     <artifactId>mysql-connector-java</artifactId>
     <scope>runtime</scope> 	
 </dependency>

com.mysql.cj.jdbc.Driver是mysql-connector-java 6
中的特性，相比mysql-connector-java 5 多了一个时区：serverTimezone，把数据源配置的驱动改一下就好了

这样启动就不会再报：Loading class com.mysql.jdbc.Driver’. This is deprecated.
The new driver class iscom.mysql.cj.jdbc.Driver’. The driver is
automatically registered via the SPI and manual loading of the driver
class is generally unnecessary.
使用UTC会有8小时的时差（中国快全球标准8小时，比如：全球标准当前是上午1点，中国时间则为上午9点），可设置为北京时间东八区GMT%2B8
或者上海时间Asia/Shanghai。

总结：
com.mysql.jdbc.Driver和mysql-connector-java 5一起用。 com.mysql.cj.jdbc.Driver和mysql-connector-java 6 一起用。

码农公寓

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