Error 500 reported after the first integration of struts2 + spring form submission

Error 500 reported after the first integration of struts2 + spring form submission
Spring + struts2 integration, a user login test program, with a configuration file segment <constant name = "struts. objectFactory "value =" spring "/> <package name =" struts-config "namespace ="/"extends =" struts-default "> <action name =" login "class = "loginAction"> <result name = "frame">/frame. jsp </result> </action> </package> </struts> but the following 500 error is reported after the form is submitted. If you directly write class = "com. system. actionLoginAction "can execute Unable to instantiate Action, loginAction, defined for 'login' in namespace '/'loginaction com. opensymphony. xwork2.defaactionactioninvocation. createAction (defaactionactioninvocation. java: 306) com. opensymphony. xwork2.defaactionactioninvocation. init (defaactionactioninvocation. java: 387) com. opensymphony. xwork2.defaactionactionproxy. prepare (defaactionactionproxy. java: 186) org. apache. struts2.impl. strutsActionProxy. prepare (StrutsActionProxy. java: 61) org. apache. struts2.impl. strutsActionProxyFactory. createActionProxy (StrutsActionProxyFactory. java: 39) com. opensymphony. xwork2.defaactionactionproxyfactory. createActionProxy (defaactionactionproxyfactory. java: 47) org. apache. struts2.dispatcher. dispatcher. serviceAction (Dispatcher. java: 458) org.apache.struts2.dispatcher.ng.ExecuteOperations.exe cuteAction (ExecuteOperations. java: 77) org. apache. struts2.dispatcher. ng. filter. strutsPrepareAndExecuteFilter. doFilter (StrutsPrepareAndExecuteFilter. java: 76) the error indicates that spring failed to create an action for struts2. The possible causes are as follows: 1. struts2-spring-plugin-2.1.8.1.jar not loaded 2. package conflict. Delete asm. jar (described on the Internet) 3. struts or spring configuration file error (refer to my "struts2 + spring integration framework") 4. the spring configuration file name is incorrect. The default spring configuration file is applicationContext. xml, in the web. <context-param> <param-name> contextConfigLocation </param-name> <param-value>/WEB-INF/applicationContext -*. xml, classpath *: applicationContext -*. xml </param-value> </context-param>