在配置Shiro时，启动tomcat报错出现异常（org.springframework.beans.factory.BeanCreationException）

      今天在配置完shiro后，启动服务器出现了一个问题（org.springframework.beans.factory.BeanCreationException），我觉得可能我们都很容易就会碰到的一个问题。



org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'shiroFilter' defined in class path resource [application_shiro.xml]: Cannot resolve reference to bean
'securityManager' while setting bean property 'securityManager'; nested exception isorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'securityManager'
defined in class path resource [application_shiro.xml]: Cannot resolve reference to bean 'myRealm' while setting bean property 'realm'; nested exception isorg.springframework.beans.factory.NoSuchBeanDefinitionException:
No bean named 'myRealm' available

at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359)

at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1492)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1237)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:552)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)

at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)

at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:235)

at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:702)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:527)

at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)

at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)

at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)

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:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)



      具体问题是这样的，看了一下问题，很明显这个错误的重要信息是这句（No bean named 'myRealm' available），想到了这点，我就去找到出现了这个 'myRealm'的地方在application_shiro.xml中，如下如所示：



找到问题所在，我把这句给注释掉：



再次开启tomcat，没有再次报错，开启成功。