Outdated: Using JavaBean without Import Element Error

This section describes the compilation error on a JSP page that uses a JavaBean without the 'page import' directive element to import the JavaBean class declared without package name.

So what can we do about the compilation error presented in the previous section? Can we remove the import statement? The answer is no. You can try by running the following modified JSP page, FirstBeanModified.jspx:

<?xml version="1.0"?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2">
<!-- FirstBeanModified.jsp
 - Copyright (c) 2002, HerongYang.com, All Rights Reserved.
<jsp:useBean id="b" class="FirstBean"/>
<jsp:setProperty name="b" property="text" value="Hello world!"/>
Property from my Bean: 
<jsp:getProperty name="b" property="text"/>
Info from my Bean: 

You will get the following compilation error saying FirstBean is not resolvable:

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

An error occurred at line: 7 in the jsp file: 

Generated servlet error:
    [javac] Compiling 1 source file

   \_\jsp\FirstBeanModified_jsp.java:43: cannot resolve symbol
symbol  : class FirstBean 
location: class org.apache.jsp.FirstBeanModified_jspx
      FirstBean b = null;

The actual cause of this error is not the compiler. It is the Tomcat compilation environment. Because you can compile the converted class, FirstBeanModified_jspx.java, correctly in a command window with same class paths used by the Tomcat environment.

The only option left to use a JavaBean with Tomcat 4.1.18 and JDK 1.4.1 is to create your JavaBean in a named package. The next section will give you an example.

Last update: 2006.

Table of Contents

 About This Book

 JSP (JavaServer Pages) Overview

 Tomcat 7 Installation on Windows Systems

 JSP Scripting Elements

 Java Servlet Introduction

 JSP Implicit Objects

 Syntax of JSP Pages and JSP Documents

 JSP Application Session

 Managing Cookies in JSP Pages

 JavaBean Objects and "useBean" Action Elements

 Managing HTTP Response Header Lines

 Non-ASCII Characters Support in JSP Pages

 Performance of JSP Pages

 EL (Expression Language)

 Overview of JSTL (JSP Standard Tag Libraries)

 JSTL Core Library

 JSP Custom Tags

 JSP Java Tag Interface

 Custom Tag Attributes

 Multiple Tags Working Together

 File Upload Test Application

Outdated Tutorials

 Outdated: Installing Tomcat 4.1.18

 Outdated: Java Class Converted by Tomcat 4.1.18

 Outdated: Hijacking Servlet Converted from JSP

 Outdated: Using Perl LWP::Debug Module to Debug

 Outdated: Installing JSTL 1.0 Apache Implementation

 Outdated: Upgrade JDK 1.3 to JDK 1.4 on Tomcat 4.1

 Outdated: Compilation Errors with JDK 1.4

Outdated: Using JavaBean without Import Element Error

 Outdated: Installing Tomcat 5.5.7


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