Could not find action or result

java struts2点击系统的“查询”功能报错：

异常信息：

Could not find action or result
No result defined for action xx.web.action.XXAction and result input - action - file:/home/customer/apps/apache-tomcat-6.0.18/webapps/xx/WEB-INF/classes/xx/web/struts_picc.xml

原因：class文件未加载上去，重启项目即可。