java.lang.NoClassDefFoundError: ognl/PropertyAccessor

本篇对 Web 开发中，项目部署后、开启 Tomcat 服务器 Console 控制台报错 java.lang.NoClassDefFoundError: ognl/PropertyAccessor 进行分析，并将解决方法记录如下：

一、异常描述：

 java.lang.NoClassDefFoundError: ognl/PropertyAccessor
 	at
 com.opensymphony.xwork2.config.impl.DefaultConfiguration.createBootstrapContainer
 (DefaultConfiguration.java:318)
 	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer
 (DefaultConfiguration.java:221)
 	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration
 (ConfigurationManager.java:67)
 	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration
 (Dispatcher.java:446)
 	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:490)
 	at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher
 (InitOperations.java:74)
 	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init
 (StrutsPrepareAndExecuteFilter.java:57)
 	at org.apache.catalina.core.ApplicationFilterConfig.initFilter
 (ApplicationFilterConfig.java:279)
 	at org.apache.catalina.core.ApplicationFilterConfig.getFilter
 (ApplicationFilterConfig.java:260)
 	at org.apache.catalina.core.ApplicationFilterConfig.<init>
 (ApplicationFilterConfig.java:105)
 	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4908)
 	at org.apache.catalina.core.StandardContext.startInternal
 (StandardContext.java:5602)
 	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
 	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
 	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
 	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
 	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)
 	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)
 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 	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: java.lang.ClassNotFoundException: ognl.PropertyAccessor
 	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass
 (WebappClassLoaderBase.java:1858)
 	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass
 (WebappClassLoaderBase.java:1701)
 	... 23 more

二、错误分析：缺少 ognl 的 jar 包，无法找到类 ognl/PropertyAccessor。

三、解决方法：ognl/PropertyAccessor 的 class 字节码文件在 ognl 的 jar 包下，将 ognl 的 jar 包导入即可。