Link to home
Start Free TrialLog in
Avatar of pmccar06
pmccar06

asked on

cannot be resolved to a type

Hi all

I have a jsp with a basic import statement at top:

<%@ page import="LoginBean"%>
<jsp:useBean id="loginBean" scope="session" class="LoginBean"/>

This class definately exists.

I can't figure out why tomcat returns the following error when I try to access that page:


org.apache.jasper.JasperException: Unable to compile class for JSP

Generated servlet error:
The import LoginBean cannot be resolved

An error occurred at line: 2 in the jsp file: /loginPage.jsp
Generated servlet error:
LoginBean cannot be resolved to a type


If I remove the import statement, the problem goes away

Any help appreciated.

Phil
Avatar of girionis
girionis
Flag of Greece image

Check to see if the LoginBean is in a package. if it is provide the fully qualified name of the package.
Your class should normally be in a package
your class *must* be in a package
add a package statement to your class
move it to a directory that matches the package name
and include the package in the import
Avatar of mukundha_expert
mukundha_expert

class="packagename.LoginBean"
even if the class is imported, fully qualified name is required in jsp:useBean tag
Avatar of pmccar06

ASKER

Hi guys

You have got me on the track, but I still have issues.  I created a folder called 'com' in the 'classes' folder for my application, and in the 'com' folder I placed another folder 'mypackage' in which I placed LoginBean.

LoginBean compiles ok as does my controller servlet that sets it.

Here is my bean:

package com.mypackage;

public class LoginBean
{
    // attributes
    String enteredUsername, enteredPassword, authenticatedUsername, message;

    // constructor method
    public LoginBean()
    {    
        enteredUsername = "";
        enteredPassword = "";
        authenticatedUsername = null;
        message = "";
    }

    // methods
    public void setEnteredUsername(String enteredUsername)
    {
        this.enteredUsername = enteredUsername;
    }
   
    public void setEnteredPassword (String enteredPassword)
    {
        this.enteredPassword = enteredPassword;
    }
   
    public void setAuthenticatedUsername (String authenticatedUsername)
    {
        this.authenticatedUsername = authenticatedUsername;
    }
   
    public void setMessage (String message)
    {
        this.message = message;
    }
   
    public String getEnteredUsername()
    {
        return enteredUsername;
    }
   
    public String getEnteredPassword()
    {
        return enteredPassword;
    }
   
    public String getAuthenticatedUsername()
    {
        return authenticatedUsername;
    }
   
    public String getMessage()
    {
        return message;
    }
}


Here is my servlet that sets this bean and calls the jsp

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import com.mypackage.*;

 
public class LoginHandler extends HttpServlet
{
   public void doGet
      (HttpServletRequest req, HttpServletResponse res)
                    throws ServletException, IOException
   {
      ServletContext context = getServletContext();
      String strUsername = req.getParameter("username");
      String strPassword = req.getParameter("password");
      HttpSession session=req.getSession(true);
     
      LoginBean loginBean = (LoginBean)session.getAttribute("loginBean");
      if (loginBean == null)
      {
         loginBean = new LoginBean();
         session.setAttribute("loginBean",loginBean);
      }
      loginBean.setEnteredUsername(strUsername);
      loginBean.setEnteredPassword(strPassword);      
         
     
      RequestDispatcher rd = context.getRequestDispatcher("/fo.jsp");
      rd.forward(req,res);      


   }

   public void doPost
      (HttpServletRequest req, HttpServletResponse res)
                    throws ServletException, IOException
   {
      doGet (req, res);
   }
}


Here is fo.jsp

<%@ page import="mypackage.LoginBean"%>
<jsp:useBean id="loginBean" class="mypackage.LoginBean" scope="session" />
<html>
<head>
<title>FO Page</title>
</head>
<body>
<h3 align="center"><font face="Arial">FO Page</font></h3>

</body>
</html>

I now the tomcat error message:

org.apache.jasper.JasperException: /fo.jsp(2,0) The value for the useBean class attribute mypackage.LoginBean is invalid.
      org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
      LoginHandler.doGet(LoginHandler.java:30)
      LoginHandler.doPost(LoginHandler.java:39)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Have I got a class path issue?

Phil

SOLUTION
Avatar of Mick Barry
Mick Barry
Flag of Australia image

Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
ASKER CERTIFIED SOLUTION
Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
Hi guys

Thanks for all your help, all problems fixed, you guys rock!

Cheers Phil