Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lo
学习架构探险，从零开始写Java Web框架时，在学习到springAOP时遇到一个异常："C:\Program Files\Java\jdk1.7.0_40\bin\java" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=D:\JetBrains\xxIntelliJ> Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.springframework.aop.framework.CglibAopProxy.<clinit>(CglibAopProxy.java:95)
at org.springframework.aop.framework.DefaultAopProxyFactory$CglibProxyFactory.createCglibProxy(DefaultAopProxyFactory.java:87)
at org.springframework.aop.framework.DefaultAopProxyFactory.createAopProxy(DefaultAopProxyFactory.java:62)
at org.springframework.aop.framework.ProxyCreatorSupport.createAopProxy(ProxyCreatorSupport.java:105)
at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:98)
at springAop.Client.main(Client.java:17)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 11 more
Process finished with exit code 1
原因是：缺少commons-logging.jar包
解决方案:
①添加maven依赖：
<dependency> <groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
②下载jar包：http://files.cnblogs.com/files/hujinshui/commons-logging-1.2.zip
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