Cannot instantiate the type Map

Cannot instantiate the type Map

如果用第19行，就会出现上面错误。因为没有这样写：extends ActionSupport implements SessionAware

package liulixin;
import java.util.HashMap;
import java.util.Map;import com.opensymphony.xwork2.ActionSupport;
public class LogInOrNotAction extends ActionSupport{Map<String,String> session;Map session2;int i;String k;/*public void setSession(Map session) {this.session = session;}public Map getSession() {return session;}*/public String isLogin(){session=new HashMap<String,String>();//session2=new Map();i=10;System.out.println(i);session.put("abc","xyz");k="abc";System.out.println(k);Object ob&#("abc");if(ob==null)return "nosir";elsereturn "yessir";}
}