急，struts中我写的一个actionBean为什么报错？

[bitiwang]

代码如下：
package com.laya.oproj.tp.wl.client;
import org.apache.struts.action.*;
import javax.servlet.http.*;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;

public class ClientUserCheckAction extends Action
{

public String execute( ActionForm form,
HttpServletRequest request, HttpServletResponse response,
ActionMapping mapping )
throws Exception{

ActionErrors errors = new ActionErrors();
ClientUserCheckForm clientusercheckform = (ClientUserCheckForm)form;

String username = clientusercheckform.getUsername();
String password1 = clientusercheckform.getPassword1();
String password2 = clientusercheckform.getPassword2();
if(username.equals("wang")==false){
errors.add("USERNAME", new ActionError("cuowu"));
saveErrors(request,errors);
return (mapping.getInputForward());
}

return (mapping.findForward("success"));

}
}
编译报错：
found : org.apache.struts.action.ActionForward
required: java.lang.String
return (mapping.getInputForward());
^
found : org.apache.struts.action.ActionForward
required: java.lang.String
return (mapping.findForward("success"));
^
2 errors

请问这是怎么回事？

[VVV_lucky]

public String execute( ActionForm form,
HttpServletRequest request, HttpServletResponse response,
ActionMapping mapping )
throws Exception{

改成
public ActionForward execute( ActionForm form,
HttpServletRequest request, HttpServletResponse response,
ActionMapping mapping )
throws Exception{

[zengzz]

同意楼上的

[Honeymaster]

up

[shsunv]

同意 VVV_lucky(*太阳*)