Spring - 創建 bean 時出錯

Question

我對 JAVA Web 應用程序很陌生，所以請記住這一點。 我承擔了一個非常大的項目，這令人生畏。 我終於修復了 Maven 依賴項，現在在 Tomcat 上運行時遇到了第一個錯誤。

請問這個錯誤是什么意思？ 一個修復程序如何修復它？

Autowired 是做什么的？

Hibernate Session Factory 有什么作用？ 錯誤的 jdbc.properties 文件設置是否會搞砸一切？

SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'billfoldApplicationDaoImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void eu.digient.billfold.support.dao.AbstractBaseDao.init(org.hibernate.SessionFactory); nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl] for bean with name 'itemConfigFactoryImpl' defined in URL [jar:file:/Users/Stu/Development/EclipseFresh/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/crazyowls-demo-web/WEB-INF/lib/crazyowls-game-1.0-SNAPSHOT.jar!/ctx-grazyowl-game.xml]; nested exception is java.lang.ClassNotFoundException: eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$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)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void eu.digient.billfold.support.dao.AbstractBaseDao.init(org.hibernate.SessionFactory); nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl] for bean with name 'itemConfigFactoryImpl' defined in URL [jar:file:/Users/Stu/Development/EclipseFresh/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/crazyowls-demo-web/WEB-INF/lib/crazyowls-game-1.0-SNAPSHOT.jar!/ctx-grazyowl-game.xml]; nested exception is java.lang.ClassNotFoundException: eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:604)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286)
... 22 more
 Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl] for bean with name 'itemConfigFactoryImpl' defined in URL [jar:file:/Users/Stu/Development/EclipseFresh/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/crazyowls-demo-web/WEB-INF/lib/crazyowls-game-1.0-SNAPSHOT.jar!/ctx-grazyowl-game.xml]; nested exception is java.lang.ClassNotFoundException: eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1281)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:575)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1350)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:355)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:334)
at org.springframework.beans.factory.BeanFactoryUtils.beanNamesForTypeIncludingAncestors(BeanFactoryUtils.java:187)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:897)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:855)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
... 24 more
 Caused by: java.lang.ClassNotFoundException: eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:255)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:416)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1302)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1273)
... 33 more

包含 eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl 的模塊的 Spring 配置：

<?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:util="http://www.springframework.org/schema/util"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
                       http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
                       http://www.springframework.org/schema/context
                       http://www.springframework.org/schema/context/spring-context-3.1.xsd
                       http://www.springframework.org/schema/util
                       http://www.springframework.org/schema/util/spring-util-3.1.xsd">
<context:annotation-config />

<context:component-scan base-package="eu.digient.billfold.goshgame.game"/>

<context:property-placeholder properties-ref="goshgameProperties" ignore-unresolvable="true" />
<util:properties id="goshgameProperties" location="classpath:goshgame.properties" />

<bean id="itemConfigFactoryImpl" class="eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl">
    <property name="properties" ref="goshgameProperties"/>
</bean>

Answer 1

它說 ClassNotFoundException: eu.digient.billfold.goshgame.game.level.ItemConfigFactoryImpl

檢查此類是否存在並添加到 spring 配置文件中

Answer 2

@Autowired 是什么和做什么有一個很好的答案 - 了解 Spring @Autowired 的用法我建議您使用 @Inject 而不是 @Autowired，因為 @Autowired 是 Spring 特定的注釋。 可以在這里找到更多 - 注入和資源和自動裝配注釋我問過類似的問題，關於屬性和使用 @autowired 創建 bean： 使用 JdbcTemplate 連接到數據庫也許 bean 的問題與您的屬性（.properties 或 .xml）文件有關。

是的，spring 顯然沒有找到您要搜索的課程。 您可以嘗試在目標目錄中搜索它。