NoSuchBeanDefinitionException: No bean named 'usersService' is defined

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org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'usersService' is defined

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严重: Exception starting filter AuthFilter

org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'usersService' is defined

at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:638)

at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1159)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:282)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)

at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:973)

at com.wanyu.frame.base.AuthFilter.init(AuthFilter.java:79)

at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)

at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)

at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)

at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4700)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5340)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)

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)

相关代码：

@Override    public void init(FilterConfig filterConfig) throws ServletException {        // 初始化方法ServletContext sc = filterConfig.getServletContext();         XmlWebApplicationContext cxt = (XmlWebApplicationContext)WebApplicationContextUtils.getWebApplicationContext(sc);                if(cxt != null && cxt.getBean("usersService") != null && logManager == null)        logManager = (LogManager) cxt.getBean("logManager");    }

错误原因：

项目使用 springframework ，发生这个错误是因为没有找到名称为'usersService' 的 bean;

1、名称写错了，你想获取的根本不是它；

2、名称写错了，你想获取它但不知道它的确切名称；

3、名称没有错，但是对应的 bean ，java 类上忘记了添加注解，如：@Component,@Service,@Controller,@Repository

解决方法：

嗯嗯，知道了错误的原因，解决方法其实已经很明确了。

我这里发现这个错误就是第一个原因，我想获取的根本不是它。

另外：

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代码中的 cxt.getBean("usersService") != null 判断是没有意义的；

如果不存在会引发异常；

要么就加上 异常处理；

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