Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

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 FilesJavajdk1.7.0_40injava" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=D:JetBrainsxxIntelliJ IDEA 2016.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.7.0_40jrelibcharsets.jar;C:Program FilesJavajdk1.7.0_40jrelibdeploy.jar;C:Program FilesJavajdk1.7.0_40jrelibextaccess-bridge.jar;C:Program FilesJavajdk1.7.0_40jrelibextdnsns.jar;C:Program FilesJavajdk1.7.0_40jrelibextjaccess.jar;C:Program FilesJavajdk1.7.0_40jrelibextlocaledata.jar;C:Program FilesJavajdk1.7.0_40jrelibextsunec.jar;C:Program FilesJavajdk1.7.0_40jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.7.0_40jrelibextsunmscapi.jar;C:Program FilesJavajdk1.7.0_40jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.7.0_40jrelibextzipfs.jar;C:Program FilesJavajdk1.7.0_40jrelibjavaws.jar;C:Program FilesJavajdk1.7.0_40jrelibjce.jar;C:Program FilesJavajdk1.7.0_40jrelibjfr.jar;C:Program FilesJavajdk1.7.0_40jrelibjfxrt.jar;C:Program FilesJavajdk1.7.0_40jrelibjsse.jar;C:Program FilesJavajdk1.7.0_40jrelibmanagement-agent.jar;C:Program FilesJavajdk1.7.0_40jrelibplugin.jar;C:Program FilesJavajdk1.7.0_40jrelib esources.jar;C:Program FilesJavajdk1.7.0_40jrelib t.jar;E:GitCodechapter1 argetclasses;C:UsersAdministrator.m2 epositorymysqlmysql-connector-java5.1.33mysql-connector-java-5.1.33.jar;C:UsersAdministrator.m2 epositoryorgaopallianceaopalliance.jar;C:UsersAdministrator.m2 epositoryasmasm2.2.3asm-2.2.3.jar;C:UsersAdministrator.m2 epositoryasmasm-commons2.2.3asm-commons-2.2.3.jar;C:UsersAdministrator.m2 epositorycglibcglib-nodep-2.2.2.jar;C:UsersAdministrator.m2 epositoryorgspringframeworkspring-aop3.2.2.RELEASEspring-aop-3.2.2.RELEASE.jar;C:UsersAdministrator.m2 epositoryorgspringframeworkspring-asm3.1.0.RELEASEspring-asm-3.1.0.RELEASE.jar;C:UsersAdministrator.m2 epositoryorgspringframeworkspring-core3.2.2.RELEASEspring-core-3.2.2.RELEASE.jar;D:JetBrainsxxIntelliJ IDEA 2016.3libidea_rt.jar" com.intellij.rt.execution.application.AppMain springAop.Client
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