启动服务器时出现异常：警告: Failed startup of context com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@1242b11{/,E:/workspace/uploadPhoto/war}Class: com.opensymphony.xwork2.spring.SpringObjectFactoryFile: SpringObjectFactory.javaMethod: getClassInstanceLine: 209 - com/opensymphony/xwork2/spring/SpringObjectFactory.java:209:-1Caused by: java.lang.NullPointerException at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:209)原因两个：1.lib中多导入包的大原因：去掉struts2-spring-plugin-2.1.8包即可，因为没有用到spring。2.还有的原因是用spring了，却没加监听器，在web.xml里面加上
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext*.xml</param-value> </context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>
转自：http://hi.baidu.com/zjameschen/blog/item/fd038b203e7ef5439922ed22.html
