Error creating bean with name 'convCommentServiceImpl': Unsatisfied dependency expressed through f

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本文记录了一个Spring项目在部署过程中遇到的依赖注入失败的问题，并详细解释了解决方案：通过在Tomcat的lib目录下添加必要的数据库连接jar包来解决。

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2018-07-13 14:11:27.104 [RMI TCP Connection(5)-127.0.0.1] ERROR org.springframework.web.context.ContextLoader - Context 
initialization failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'convCommentServiceImpl': 
Unsatisfied dependency expressed through field 'convCommentMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No qualifying bean found for dependency [com.zhengtoon.bjtoon.conv.dao.ConvCommentMapper]: 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:569) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:349) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5003) ~[catalina.jar:7.0.64]
        ....
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) [?:1.8.0_91]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_91]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_91]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean found for dependency [com.zhengtoon.bjtoon.conv.dao.ConvCommentMapper]: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1463) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1094) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1056) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:566) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	... 60 more
七月 13, 2018 2:11:27 下午 org.apache.catalina.core.StandardContext startInternal
严重: One or more listeners failed to start. Full details will be found in the appropriate container log file
七月 13, 2018 2:11:27 下午 org.apache.catalina.core.StandardContext startInternal
严重: Context [] startup failed due to previous errors
[2018-07-13 02:11:27,173] Artifact city-convphoto-ui:war exploded: Error during artifact deployment. See server log for details.
七月 13, 2018 2:11:27 下午 org.apache.catalina.loader.WebappClassLoader loadClass
信息: Illegal access: this web application instance has been stopped already.  Could not load org.apache.zookeeper.server.ZooTrace.  
 eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, 
 and has no functional impact.
java.lang.IllegalStateException
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1750)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1709)
	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1188)

七月 13, 2018 2:11:27 下午 org.apache.catalina.loader.WebappClassLoader loadClass
信息: Illegal access: this web application instance has been stopped already.  Could not load org.apache.zookeeper.ClientCnxn$SendThread.  
The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which 
caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1750)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1709)
	at org.apache.logging.log4j.util.LoaderUtil.loadClass(LoaderUtil.java:139)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.loadClass(ThrowableProxy.java:548)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.toExtendedStackTrace(ThrowableProxy.java:660)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:137)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:121)
	at org.apache.logging.log4j.core.impl.Log4jLogEvent.getThrownProxy(Log4jLogEvent.java:555)
	at org.apache.logging.log4j.core.pattern.ExtendedThrowablePatternConverter.format(ExtendedThrowablePatternConverter.java:61)
	at org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:38)
	....
	at org.apache.zookeeper.server.ZooKeeperThread.handleException(ZooKeeperThread.java:60)
	at org.apache.zookeeper.server.ZooKeeperThread$1.uncaughtException(ZooKeeperThread.java:36)
	at java.lang.Thread.dispatchUncaughtException(Thread.java:1952)

七月 13, 2018 2:11:27 下午 org.apache.catalina.loader.WebappClassLoader loadClass
信息: Illegal access: this web application instance has been stopped already.  Could not load org.apache.catalina.loader.WebappClassLoader.  
The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which 
caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1750)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1709)
	at org.apache.logging.log4j.util.LoaderUtil.loadClass(LoaderUtil.java:139)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.loadClass(ThrowableProxy.java:548)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.toExtendedStackTrace(ThrowableProxy.java:660)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:163)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:140)
	at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:121)
	at org.apache.logging.log4j.core.impl.Log4jLogEvent.getThrownProxy(Log4jLogEvent.java:555)
	at org.apache.logging.log4j.core.pattern.ExtendedThrowablePatternConverter.format(ExtendedThrowablePatternConverter.java:61)
	....
	at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2091)
	at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2011)
	at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1884)
	at org.apache.logging.slf4j.Log4jLogger.warn(Log4jLogger.java:249)
	at org.apache.zookeeper.server.ZooKeeperThread.handleException(ZooKeeperThread.java:60)
	at org.apache.zookeeper.server.ZooKeeperThread$1.uncaughtException(ZooKeeperThread.java:36)
	at java.lang.Thread.dispatchUncaughtException(Thread.java:1952)

启动项目出现上述问题，我解决的方法是在tomcat/lib中添加了druid-1.0.26.jar和mysql-connector-java-5.1.39.jar，然后问题就解决了。连接数据库用的是数据源jidi