Spring 框架主方法运行后异常 No bean named 'XXX' is defined

最新推荐文章于 2025-06-10 11:11:03 发布

kaimeng5566

最新推荐文章于 2025-06-10 11:11:03 发布

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文章标签： spring 异常框架 bean

本文链接：https://blog.youkuaiyun.com/kaimeng5566/article/details/78250154

本文记录了使用Spring框架加载applicationContext.xml配置文件时遇到的NoSuchBeanDefinitionException异常，并展示了如何通过正确指定Bean名称解决问题的过程。

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十月 16, 2017 3:19:37 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@426a086a: startup date [Mon Oct 16 15:19:37 CST 2017]; root of context hierarchy
十月 16, 2017 3:19:37 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [applicationContext.xml]
十月 16, 2017 3:19:38 下午 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
信息: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
十月 16, 2017 3:19:38 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@4f5b0046: defining beans [empDao01,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,template,dbcp,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'empDao02' is defined
   at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:570)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1114)
   at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:279)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
   at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1121)

at org.show51.testMain.main(testMain.java:29)

原代码：

public class testMain {
   public static void main(String[] args) {
       String conf="applicationContext.xml";
       ApplicationContext ac=
               new ClassPathXmlApplicationContext(conf);
       EmpDao01 empDao01=ac.getBean("empDao02", EmpDao01.class);
       Emp emp01=new Emp();
       emp01.setAdminId("9");
       emp01.setAdminname("tian");
       emp01.setAdminpwd("111");
       empDao01.save(emp01);
   }
}

原EmpDao01代码

@Repository
   public class EmpDao01{
   @Resource//注入
       private JdbcTemplate template;
       public void save(Emp emp){
           String sql="insert into t_test"
                   +"(adminId,adminname,adminpwd) "
                   + "values (?,?,?)";
           Object[] param={
                   emp.getAdminId(),
                   emp.getAdminname(),
                   emp.getAdminpwd()
           };
           template.update(sql, param);
       }
   }

报出问题就在于： EmpDao01 empDao01=ac.getBean("empDao02", EmpDao01.class);

的getBean（arg0，arg1），这个arg0的参数要是你EmpDao01 类的首字母缩写，这里实际是从这个类中获取bean对象，你要写的话就是将这个类名首字母缩写填入arg0就行了

再次运行：

十月 16, 2017 3:25:41 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6c069ec: startup date [Mon Oct 16 15:25:41 CST 2017]; root of context hierarchy
十月 16, 2017 3:25:41 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [applicationContext.xml]
十月 16, 2017 3:25:41 下午 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
信息: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
十月 16, 2017 3:25:41 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7ce5bef1: defining beans [empDao01,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,template,dbcp,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
查询一下mysql数据库：
有这么一条数据 id：9；用户名：tian；密码：111的数据