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cannot be resolved to a type

Posted on 2006-07-19
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Last Modified: 2013-12-03
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
0
Comment
Question by:pmccar06
  • 3
  • 2
  • 2
  • +3
11 Comments
 
LVL 35

Expert Comment

by:girionis
ID: 17137116
Check to see if the LoginBean is in a package. if it is provide the fully qualified name of the package.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 17137117
Your class should normally be in a package
0
 
LVL 92

Expert Comment

by:objects
ID: 17137156
your class *must* be in a package
0
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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 92

Expert Comment

by:objects
ID: 17137158
add a package statement to your class
move it to a directory that matches the package name
and include the package in the import
0
 
LVL 10

Expert Comment

by:mukundha_expert
ID: 17137334
class="packagename.LoginBean"
0
 
LVL 10

Expert Comment

by:mukundha_expert
ID: 17137345
even if the class is imported, fully qualified name is required in jsp:useBean tag
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 17137928
0
 

Author Comment

by:pmccar06
ID: 17145027
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

0
 
LVL 92

Assisted Solution

by:objects
objects earned 60 total points
ID: 17145046
should be

<%@ page import="com.mypackage.LoginBean"%>
<jsp:useBean id="loginBean" class="com.mypackage.LoginBean" scope="session" />
0
 
LVL 30

Accepted Solution

by:
Mayank S earned 65 total points
ID: 17145126
>> the 'com' folder I placed another folder 'mypackage' in which I placed LoginBean

Hope you mean LoginBean.class
0
 

Author Comment

by:pmccar06
ID: 17150331
Hi guys

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

Cheers Phil
0

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