Desperately looking for help with:The value for the useBean class attrib...
hello everybody!
I am looking up in forums since this morning in order to fix this problem with java beans but i still didn't find a solution! I hope somebody in this forum can help me! I write down exactly everything I did with the hope that we will soon leave in the forum a sort of tutorial for fixing this common problem (I read a lot of topics without a clear solution)..
What I use : TOMCAT 5.5.20, JDK 1.5.0_11 and ECLIPSE 3.2.1 with WTP. My OS is Windows XP.
What I did step-by-step:
1) Create new project "bean2" in eclipse+WTP: Dynamic Web Project. I've set Target Runtime to Apache Tomcat 5.5 and used the <custom> configuration. I left also the default settings for content directory (WebContent) and Java Directory Source (src).
2) Once the project has been created, i modified the Build path in order to have .class files created in the proper directory. In project explorer i expanded Java Resources: src until i could see a library (e.g. Web App Libraries) and right click on it. Then I selected build path ->Configure build path. Then in the source folder i choosed the Source palette and there i changed the default output folder to "bean2/WebContent/WEB-INF/classes".
3) I created a new java class in a package called user. Right click on Java REsources->New->Class. Package: user Class: User
The code of the bean User.java is:
package user;
publicclass User{
protected String lastName;
protected String firstName;
public User(){
}
public String getLastName(){
return lastName;
}
publicvoid setLastName(String lname){
lastName = lname;
}
public String getFirstName(){
return firstName;
}
publicvoid setFirstName(String fname){
firstName = fname;
}
}
4) Then I created an handoff1.jsp file in the WebContent folder. The content of the file is:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ pageimport ="user.*" %>
<jsp:useBean id="handoff" scope="session" class="user.User" />
This is the setting page! <% handoff.setFirstName("George"); %>
Then a handoff2.jsp file (note that the code is copied from a book):
<%@ pageimport ="user.*" %>
<jsp:useBean id="handoff" scope="session" class="user.User" />
This is the getting page!
handoff= <%= handoff.getFirstName() %>
]
5) Finally I started tomcat by clicking on startup.bat (in the bin folder) and pointed the browser to http://localhost:8080/bean2/WebContent/handoff1.jsp
6) What I got is this:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfillingthis request.
exception
org.apache.jasper.JasperException: /WebContent/handoff1.jsp(4,0) The valuefor the useBeanclass attribute user.User is invalid.
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
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)
root cause
org.apache.jasper.JasperException: /WebContent/handoff1.jsp(4,0) The valuefor the useBeanclass attribute user.User is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1174)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Generator.generate(Generator.java:3320)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
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)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.
So: What did I do wrong? I wasted hours and hours trying to fix this but without a result.. Can you help me please?
Thanks you 10^999999!! :)
