First I put my java files in apache server WEB-INF/classes/...

There is one simple java I made:
package Promotion;

public class User{
    private String ID;
    private String email;
    private String firstName;
    private String lastName;
    
    /** Creates a new instance of user */
    public User() {
            this.ID = null;
            this.email = null;
            this.firstName = null;
            this.lastName = null;
    }
    
    public String getID(){
        return this.ID;
    }
    
    public void setID(String ID){
        this.ID = ID;
    }
    
    public String getEmail(){
        return this.email;
    }
     
    public void setEmail(String email){
        this.email = email;
    }
    
    public String getFirstName(){
        return this.firstName;
    }
    
    public void setFirstName(String firstName){
        this.firstName = firstName;
    }
    
    public String getLastName(){
        return this.lastName;
    }
    
    public void setLastName(String lastName){
        this.lastName = lastName;
    }
}

Then I use Bean in my JSP as follow:
<jsp:useBean id="User" class="Promotion.User" scope="session">
<%
    User a = new User();
%>
</jsp:useBean>


After that I try to compile my JSP page. But error comes out:

type Exception report

message Internal Server Error

description The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.

exception

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

An error occurred at line: 5 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
    [javac] Compiling 1 source file

/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:54: package Promotion does not exist
      Promotion.User User = null;
               ^



An error occurred at line: 5 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:56: package Promotion does not exist
        User = (Promotion.User) pageContext.getAttribute("User", PageContext.SESSION_SCOPE);
                         ^



An error occurred at line: 5 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:59: package Promotion does not exist
            User = (Promotion.User) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "Promotion.User");
                             ^



An error occurred at line: 26 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:94: package Promotion does not exist
    Promotion.User [] customer = new Promotion.User[totalID];
             ^



An error occurred at line: 26 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:94: package Promotion does not exist
    Promotion.User [] customer = new Promotion.User[totalID];
                                              ^



An error occurred at line: 26 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:105: cannot resolve symbol
symbol : class User
location: class org.apache.jsp.draw_jsp
              customer[counter] = new User();
                                      ^



An error occurred at line: 49 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:117: cannot resolve symbol
symbol : class User
location: class org.apache.jsp.draw_jsp
    User [] winner = new User[10];
    ^



An error occurred at line: 49 in the jsp file: /test/new/promotion/draw.jsp

Generated servlet error:
/usr/local/tomcat/work/Standalone/accupc.com/_/test/new/promotion/draw_jsp.java:117: cannot resolve symbol
symbol : class User
location: class org.apache.jsp.draw_jsp
    User [] winner = new User[10];
                         ^
8 errors

Hi Eric.

Do you have the User bean in the right directory under your WEB-INF/classes directory?

Since you have a package declaration of 'package Promotion', it should be in:
WEB-INF/classes/Promotion/User.class
and not
WEB-INF/classes/User.class

Also, just FYI, the usual standard is for package names to be all lowercase. But this wouldn't affect your application, just a stylistic choice.

Check if it's in the right directory and see if that works...

-- Joe

Thanks for the suggestion. I feel so sorry that I remember I have to restart the web server. Hehe