在ServletContext资源[/WEB-INF/ApplationConext.xml]中找不到名为‘foodDAO’的Bean的类[food.bill.dao.FoodDaoImpl]；

cuxqih21  于 2022-10-23  发布在  Spring
关注(0)|答案(4)|浏览(110)

我正在学习Spring，却陷入了一个错误。Spring无法在Bean中找到定义的类：

  1. 31-Mar-2018 20:12:44.049 SEVERE [RMI TCP Connection(3)-127.0.0.1] 
  2. org.springframework.web.context.ContextLoader.initWebApplicationContext 
  3. Context initialization failed
  4. org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [food.bill.dao.FoodDaoImpl] for bean with name 'foodDAO' defined in ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: food.bill.dao.FoodDaoImpl
  5. at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1385)
  6. at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:641)
  7. at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:609)
  8. at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1484)
  9. at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1007)
  10. at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:741)
  11. at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
  12. at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
  13. at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443)
  14. at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325)
  15. at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
  16. at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4753)
  17. at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5215)
  18. at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
  19. at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
  20. at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
  21. at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
  22. at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1736)
  23. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  24. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  25. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  26. at java.lang.reflect.Method.invoke(Method.java:498)
  27. at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
  28. at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
  29. at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
  30. at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:482)
  31. at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431)
  32. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  33. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  34. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  35. at java.lang.reflect.Method.invoke(Method.java:498)
  36. at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
  37. at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
  38. at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
  39. at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
  40. at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
  41. at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
  42. at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
  43. at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
  44. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  45. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  46. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  47. at java.lang.reflect.Method.invoke(Method.java:498)
  48. at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
  49. at sun.rmi.transport.Transport$1.run(Transport.java:200)
  50. at sun.rmi.transport.Transport$1.run(Transport.java:197)
  51. at java.security.AccessController.doPrivileged(Native Method)
  52. at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
  53. at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
  54. at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
  55. at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
  56. at java.security.AccessController.doPrivileged(Native Method)
  57. at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
  58. at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  59. at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  60. at java.lang.Thread.run(Thread.java:748)
  61. Caused by: java.lang.ClassNotFoundException: food.bill.dao.FoodDaoImpl
  62. at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1291)
  63. at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
  64. at org.springframework.util.ClassUtils.forName(ClassUtils.java:250)
  65. at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:401)
  66. at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1432)
  67. at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1377)
  68. ... 55 more

下面是我的applationConext.xml：

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3.        xmlns:context="http://www.springframework.org/schema/context"
  4.        xmlns:mvc="http://www.springframework.org/schema/mvc"
  5.        xmlns="http://www.springframework.org/schema/beans"
  6.        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
  8.     <bean id="foodDAO" class="food.bill.dao.FoodDaoImpl"/>
  10.     <bean id="foodService" class="food.bill.service.FoodServiceImpl">
  11.         <property name="foodDao" ref="foodDAO"/>
  12.     </bean>
  14. </beans>

FoodDaoImpl：

  1. package food.bill.dao;
  3. import food.bill.model.FoodItem;
  4. import org.apache.logging.log4j.LogManager;
  5. import org.apache.logging.log4j.Logger;
  6. import org.springframework.stereotype.Component;
  8. import javax.persistence.EntityManager;
  9. import javax.persistence.PersistenceContext;
  10. import javax.persistence.Query;
  11. import java.util.List;
  13. public class FoodDaoImpl implements FoodDao {
  15.     private static final Logger log = LogManager.getLogger(FoodDaoImpl.class);
  16.     @PersistenceContext
  17.     EntityManager em;
  19.     public List<FoodItem> getMenu() {
  20.         List<FoodItem> foodMenu = null;
  21.         try {
  22.             Query query = em.createNamedQuery("FoodItem.getMenu");
  23.                  foodMenu = (List<FoodItem>) query.getResultList();
  24.             return foodMenu;
  25.         }catch (Exception e){
  26.             log.info("Error in getting Menu");
  27.         }
  28.         return foodMenu;
  29.     }
  31.     public void createOrder() {
  33.     }
  34. }

FoodServiceImpl：

  1. package food.bill.service;
  3. import food.bill.dao.FoodDao;
  4. import food.bill.model.FoodItem;
  5. import org.springframework.stereotype.Service;
  7. import java.util.List;
  9. @Service
  10. public class FoodServiceImpl implements FoodService {
  12.    private FoodDao foodDao;
  14.     public void setFoodDao(FoodDao foodDao) {
  15.         this.foodDao = foodDao;
  16.     }
  18.     public List<FoodItem> getMenu() {
  19.         return this.foodDao.getMenu();
  20.     }
  21. }

我已经检查了输出文件夹，所有文件都已更新。我试着找了几个小时，但没有找到任何结果。任何帮助都将不胜感激。先谢谢你。

spring

4条答案

按热度按时间
xriantvc

xriantvc1#

Org.springframework.beans.factory.CannotLoadBeanClassException：找不到ServletContext资源[/WEB-INF/ApplationConext.xml]中定义的名为‘FoodDAO’的Bean的类[Food.bill.dao.FoodDaoImpl]；嵌套异常为java.lang.ClassNotFoundException：Food.bill.dao.FoodDaoImpl
简单地说，这意味着Spring试图在您定义的类路径中为类food.bill.dao.FoodDaoImpl“找到”.class文件，但没有找到。
因此，请首先检查food.bill.dao.FoodDaoImpl文件是否真的编译为.class文件，以及它在输出文件目录中的位置。

赞(0）分享  回复(0）举报  2022-10-23
ar7v8xwq

ar7v8xwq2#

有几件事需要仔细检查
1.如果您使用的是Maven或任何其他构建工具，请尝试使用“Maven lean”，并检查它是否删除了foodDao.class文件。如果是，则在清理后执行Maven构建，并查看它是否修复了该问题。
1.如果步骤1不能解决问题，请尝试将foodDAO的Bean定义放在context.xml中的FoodService的Bean定义之后(这只是一个想法)
如果问题仍然存在，请让我知道。

赞(0）分享  回复(0）举报  2022-10-23
eufgjt7s

eufgjt7s3#

这似乎是Maven内部的一个错误。我也多次面对这个问题。即使当类存在但根据错误没有被检测到时，执行以下操作对我也是有效的。

方案一：删除源包中的Java FILE类。

1.创建代码备份，并将Java文件从源包中删除。
1.通过使用与您遇到错误时相同的Java Class代码创建新文件，将该文件添加回源包。

解决方案II：将Java FILE类从一个源包移到另一个源包。

1.将Java FILE类从一个源包移动到另一个源包。
1.然后将Java FILE类放回其原始包。
我希望这两个解决方案中的任何一个都会有帮助。

赞(0）分享  回复(0）举报  2022-10-23
uurv41yg

uurv41yg4#

我的经验是：

  • 我的Eclipse项目一直运行正常
  • 有时，它会给我相同的错误消息
  • 我所做的只是删除“目标”中的所有文件，然后重新编译。看起来不错。
赞(0）分享  回复(0）举报  2022-10-23
我来回答

相关问题

    查看更多

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新问答

    更多
    • 蜀ICP备13028337号-1 大数据知识库 https://www.saoniuhuo.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com