[Closed] Only a type can be imported

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This topic has 7 replies, 2 voices, and was last updated 18 years, 4 months ago by Riyad Kalla.

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December 9, 2005 at 4:40 am #242899 Reply
pg33
Member
Hello,

I have created a simple web project with MyEclipse 4.0.3 GA which contents is :

– a class called “Class” in a package called “com.asmalltest.general”.
– a test.jsp file :

importing the class at the beginning of the file
```
                <%@ page import="com.asmalltest.general.Class" %>
```
and using an instance in the body :
```
              <body>
                 <%
                       Class anObject = new Class("Property Value");
                     out.println(anObject.getProperty());
                %>
             </body>
```
The deployment on Tomcat 5.5.12 works well, nevertheless, an error occurs when I click in order to display the test.jsp file :

org.apache.jasper.JasperException: Impossible de compiler la classe pour la JSP

Erreur de servlet générée:
Only a type can be imported. com.asmalltest.general.Class resolves to a package

I have watched some other topics on the forums before writing this one and this seems to be probably quite the same problem as the subject entitled “the import org.apache.log4j can not be resolved”, but in this case the class required is inside the project and not an in an external JAR.

After some searches on the Internet I found this could come from the CLASSPATH variable but I am not sure about this and I wonder which value to set in in order to make each web project works fine.

Any advice is welcome,

Thanks and Regards,

pg33

—————————————————–

Here is my configuration summary :

*** Date: Fri Dec 09 11:07:39 CET 2005

*** System properties:
OS=WindowsXP
OS version=5.1
Java version=1.5.0_03

*** MyEclipse details:
MyEclipse Enterprise Workbench

Version: 4.0.3 GA
Build id: 20051025-4.0.3-GA

*** Eclipse details:
Eclipse SDK

Version: 3.1.1
Build id: M20050929-0840

SDK du projet Eclipse

Version : 3.1.1
ID compilation : M20050929-0840

Plateforme Eclipse

Version : 3.1.1
ID compilation : M20050929-0840

Outils de développement Java Eclipse

Version : 3.1.1
ID compilation : I20050627-1435

Eclipse RCP

Version: 3.1.1
Build id: I20050627-1435

Environnement de développement du plug-in Eclipse

Version: 3.1.1
ID compilation : I20050627-1435

Eclipse startup command=-os
win32
-ws
win32
-arch
x86
-launcher
C:\Program Files\Eclipse 3.1\eclipse\eclipse.exe
-name
Eclipse
-showsplash
600
-exitdata
bc4_4c
-vm
C:\jdk1.5.0_03\bin\javaw.exe
December 9, 2005 at 8:21 am #242909 Reply

Riyad Kalla
Member

pg33,
Please post the ENTIRE contents of your Class file here, use the “code” button below to wrap it, so the formatting is maintained.

I have a feeling either your package statement is wrong, or there is a problem caused by you using the name “Class”. It’s typically a good idea not to use well known names for your own class names.

December 9, 2005 at 10:58 am #242934 Reply
pg33
Member
Hello,

I agree with you for the advice about the class name so I renamed it “Example” and I retried.

Here is the complete code of Example.java :
```
package com.asmalltest.general;

public class Example {
    
    private String property;
    
    public String getProperty() {
        return property;
    }

    public Example(String argProperty) {
        
        this.property = argProperty;
    }
}
```
and the complete related error message :
```
org.apache.jasper.JasperException: Impossible de compiler la classe pour la JSP

Erreur de servlet générée:
Only a type can be imported. com.asmalltest.general.Example resolves to a package

Une erreur s'est produite à la ligne: 28 dans le fichier jsp: /WebRoot/test.jsp
Erreur de servlet générée:
The constructor Class(String) is undefined

Une erreur s'est produite à la ligne: 28 dans le fichier jsp: /WebRoot/test.jsp
Erreur de servlet générée:
The method getProperty() is undefined for the type Class


    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:409)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
    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)
```
The Tomcat error message “<classname> resolves to a package” is, at my point of view, not appropriate for the situation because there is really a class called Example.java in a real package.

As for system variables :

CLASSPATH=C:\Oracle\ora92\jdbc\lib\classes12.zip;C:\Oracle\ora92\jdbc\lib\nls_charset12.zip
(info added by the installation of a version of Oracle coming from a disk delivered with a SQL/Oracle book)
JAVA_HOME=C:\jdk1.5.0_03
CATALINA_HOME=C:\Program Files\Apache Software Foundation\Tomcat 5.5

I should also add that my web projects used to work until late October, when I updated Tomcat (5.0 before) and MyEclipse. That is why I created a simple web project to test the problem.

pg
December 9, 2005 at 11:15 am #242938 Reply
pg33
Member
Sorry, I forgot to change the test.jsp use of “Example” instead of “Class”.

Here is the entire code of test.jsp :
```
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="com.asmalltest.general.Example" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'test.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    
    
  </head>
  
  <body>
    <%
        Example anObject = new Example("Property Value");
        out.println(anObject.getProperty());
    %>
  </body>
</html>
```
and the entire error message displayed in Tomcat (this time with Example) :
```
org.apache.jasper.JasperException: Impossible de compiler la classe pour la JSP

Erreur de servlet générée:
Only a type can be imported. com.asmalltest.general.Example resolves to a package

Une erreur s'est produite à la ligne: 28 dans le fichier jsp: /WebRoot/test.jsp
Erreur de servlet générée:
Example cannot be resolved to a type

Une erreur s'est produite à la ligne: 28 dans le fichier jsp: /WebRoot/test.jsp
Erreur de servlet générée:
Example cannot be resolved to a type


    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:409)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
    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)
```
December 9, 2005 at 12:37 pm #242949 Reply

Riyad Kalla
Member

This baffles me, can you send me this project?

File > Export > ZIP, email it to support@genuitec.com ATTN Riyad, and provide a link to this post so I know why I’m getting it please.

December 10, 2005 at 9:35 am #242970 Reply

Riyad Kalla
Member

I got your project, imported it and rebuilt it, nothing was wrong at all. No error markers, autocomplete worked fine, everything is a-ok. This makes me think something is going on with your JDK setup.

When the error marker pops up on your side, is it in the left margin or right margin?

December 15, 2005 at 2:54 am #243088 Reply

pg33
Member

Hello,

First sorry for my late answer, I forgot to check the notification checkbox in my last reply so I saw your message only yesterday.

I finally uninstalled MyEclipse (3.8.4, 4.0, 4.0.3), Eclipse 3.1.1, Eclipse 3.0, Tomcat and reinstalled Eclipse 3.1.1, MyEclipse 4.0.3 and Tomcat 5.5.12 from scratch. Instead of waiting 5 minutes to run Eclipse, now the delay is only 15 seconds. Maybe there were too much unused plug-ins in my previous configuration…

I retried the Test project and it works. I tried for a while to find what was wrong before and I noticed that when the application is deployed from MyEclipse it works, but when it is deployed from Tomcat the error “Only a type can be imported” occurs. I think that I have to learn a lot about J2EE development and application servers.

Thank you for your time, this topic can be closed.

December 15, 2005 at 6:25 am #243092 Reply

Riyad Kalla
Member

Thank you for doing that pg33 and glad to hear things are working as they should now.
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