严重: Developer Notification (set struts.devMode to false to disable this message)

[小红_Su]

代码如下

这是struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>
 
  <constant name="struts.devMode" value="true" />
 
  <package name="basicstruts2" extends="struts-default">
    <action name="index">
      <result>/index.jsp</result>
    </action>
         
    <action name="login" class="shopping.LoginTest" method="execute">
      <result name="userbe">/shoppingcart.jsp</result><!-- 用户页面 -->
      <result name="manager">/managercart.jsp</result><!-- 管理员页面 -->
      <result name="usernull">/login.jsp</result>
    </action>
  </package>
</struts>

这是LoginTest类

package shopping;

import java.sql.*;

import java.util.Map;
import org.apache.struts2.interceptor.SessionAware;

import dao.*;
import bean.*;

import com.opensymphony.xwork2.ActionSupport;

public class LoginTest extends ActionSupport implements SessionAware {
	private String username;
	private String password;
	
	private Map<String,Object> session;
	
	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	//验证登录信息
	public String execute(){
		UserDao dao = new UserDao();
		UserBean user = new UserBean();
		user = dao.selectUser(username);
		//验证
		if(user!=null && password.equals(user.getPassword())){
			session.put("use",user); //登录后将当前user信息保存到session中
			System.out.println(user.getRole());
			if(user.getRole().equals("user")){
				return "userbe";
			}else{
				return "manager";
			}
		}else{
			return "usernull";
		}
	}
	
	@Override
	public void setSession(Map<String, Object> session) {
		// TODO Auto-generated method stub
		this.session = session;
	}
}

跳转后jsp是shoppingcart.jsp

 <body>
  ${sessionScope.user.role}
  </body>

执行后跳转一切正常，但是session上并没有传到值上去，也打印不出来，控制台也提示了错误如下

严重: Developer Notification (set struts.devMode to false to disable this message):
Unexpected Exception caught setting 'role' on 'class shopping.LoginTest: Error setting expression 'role' with value ['user', ]

跪求大神帮忙解决一下，今天等着用，明天要交，拜托了

[街头小贩]

user = dao.selectUser(username); 打印一下user的role属性看一看是否有异常