Outdated: Compilation Errors with JDK 1.4

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

To demonstrate the Tomcat error, let's review my FirstBean.java class again:

/**
 * FirstBean.java
 * Copyright (c) 2002, HerongYang.com, All Rights Reserved.
 */
public class FirstBean {
  private String text = "null";
  public String getText() {
    return text;
  }
  public void setText(String text) {
    this.text = text;
  }
  public String getInfo() {
    return "My JavaBean - Version 1.00";
  }
}

Here is the JSP page, FirstBean.jspx, that uses my FirstBean class:

<?xml version="1.0"?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2">
<!-- FirstBean.jspx
 - Copyright (c) 2002, HerongYang.com, All Rights Reserved.
-->
<jsp:directive.page contentType="text/html"/>
<html><body>
<jsp:directive.page import="FirstBean"/>
<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"/>
<br/>
Info from my Bean: 
<jsp:expression>b.getInfo()</jsp:expression>
</body></html>
</jsp:root>

To deploy the JavaBean class and the JSP page to the Tomcat server, run these commands in a command window:

>\local\j2sdk1.4.1\bin\javac FirstBean.java

>copy FirstBean.class 
   \local\jakarta-tomcat-4.1.18\webapps\ROOT\WEB-INF\classes

>copy FirstBean.jspx \local\jakarta-tomcat-4.1.18\webapps\ROOT\

When visiting FirstBean.jspx with a Web browser, I do receive this compilation error:

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

An error occurred at line: 9 in the jsp file: /FirstBean.jspx

Generated servlet error:
    [javac] Compiling 1 source file

C:\local\jakarta-tomcat-4.1.18\work\Standalone\localhost
   \_\FirstBean_jsp.java:8: '.' expected
import FirstBean;

After reading the JDK 1.4 documentation, I found the root cause of the error. My FirstBean class was declared without any package name. So it is considered as in the unnamed package. JDK 1.4 added a new rule that does not allow an import statement to be used on classes in unnamed packages.

See next section on suggestions to resolve this compilation error.

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

 References

 PDF Printing Version