在学习 Spring 框架时得到 java.lang.NoClassDefFoundError
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/32690431/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-11-02 20:37:20 来源:igfitidea点击:
Got java.lang.NoClassDefFoundError while learning Spring framework
提问by Searene
I've been searching for the reason why it failed for a long time, but couldn't figure it out.
我一直在寻找它失败的原因很长一段时间，但无法弄清楚。
The structure of files
文件的结构
src
|__com.learn.spring.beans.annotation
| |__Main.java
| |__TestObject.java
|
|__beans.annotation.xml
Main.java
主程序
package com.learn.spring.beans.annotation;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-annotation.xml");
TestObject to = (TestObject)ctx.getBean("testObject");
System.out.println(to);
}
}
TestObject.java
测试对象
package com.learn.spring.beans.annotation;
import org.springframework.stereotype.Component;
@Component
public class TestObject {
}
beans-annotation.xml
beans-annotation.xml
<?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"
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-4.0.xsd">
<context:component-scan base-package="com.learn.spring.beans.annotation"></context:component-scan>
</beans>
I got the following error:
我收到以下错误：
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
Sep 21, 2015 4:08:51 afternoon org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1a6c5a9e: startup date [Mon Sep 21 16:08:51 CST 2015]; root of context hierarchy
Sep 21, 2015 4:08:51 afternoon org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [beans-annotation.xml]
Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [beans-annotation.xml]; nested exception is java.lang.NoClassDefFoundError: org/springframework/aop/TargetSource
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:414)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:252)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:604)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:509)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.learn.spring.beans.annotation.Main.main(Main.java:13)
Caused by: java.lang.NoClassDefFoundError: org/springframework/aop/TargetSource
at org.springframework.context.annotation.AnnotationConfigUtils.registerAnnotationConfigProcessors(AnnotationConfigUtils.java:154)
at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.registerComponents(ComponentScanBeanDefinitionParser.java:150)
at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:88)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:74)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1411)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1401)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:168)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:138)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:94)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:508)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)
... 14 more
Caused by: java.lang.ClassNotFoundException: org.springframework.aop.TargetSource
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 25 more
回答by JC Carrillo
Add the following to your pom.xml (if using maven)
将以下内容添加到您的 pom.xml（如果使用 maven）
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.2.1.RELEASE</version>
</dependency>
回答by Jens
As you can see in the stacktrace the error is java.lang.ClassNotFoundException: org.springframework.aop.TargetSource.
正如您在堆栈跟踪中看到的，错误是java.lang.ClassNotFoundException: org.springframework.aop.TargetSource.
That means, that you miss the spring-aop.jar in your classpath.
这意味着，您错过了类路径中的 spring-aop.jar。
Add it as a dependecy to your pom.xml if you work with maven. If not you have to add it and all the dependencies manually to your classpath.
如果您使用 maven，请将其作为依赖项添加到您的 pom.xml 中。如果没有，您必须手动将它和所有依赖项添加到您的类路径中。
回答by Arvind Chavhan
You could download required jar from Maven repo. and add the same in your classpath. I hope it will work fine.
您可以从Maven repo下载所需的 jar 。并在您的类路径中添加相同的内容。我希望它能正常工作。
