NullPointerException at com.opensymphony.xwork2.spring.SpringObjectFactory.getC

at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:209

2010-07-19 18:27

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.SpringObjectFactory
File: SpringObjectFactory.java
Method: getClassInstance
Line: 209 - com/opensymphony/xwork2/spring/SpringObjectFactory.java:209:-1
Caused 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
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>