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same error when using XP and Eclipse to run program

Derek B Smith

Joined: Oct 08, 2006
Posts: 9

I am using Eclipse IDE to practice Java 5 coding as well as the DOS command line. I am referencing HeadFirst Java for practice and the code error I cannot fix is this from the command line and from within Eclipse IDE:
Any help please?

thank you

From Eclipse:
java.lang.NoClassDefFoundError: DooBee
Exception in thread "main"

From DOS:

C:\temp>java DooBee
Exception in thread "main" java.lang.NoClassDefFoundError: DooBee

Here is my test code:

public class DooBee {
public static void main (String[] args) {
int x = 1;
while (x < 3) {
x += 1;

if (x == 3) {
} // end if
} // end main
} // end class

Here are my ENV variable:

C:\temp>echo %PATH%
C:\Perl\bin\;C:\ClarifyCRM12.0\Configurator\Common Files\CCAutomation;C:\ClarifyCRM12.0\Clarif
yClient;C:\Program Files\Compaq\Compaq Management Agents\Dmi\Win32\bin;C:\WINDOWS\system32;C:\
WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\IBM\Client Access;C:\Program Files\IBM\Clien
t Access\Shared;C:\Program Files\IBM\Client Access\Emulator;C:\Program Files\ShowCase STRATEGY
\bin;C:\WINDOWS\system32\nls;C:\WINDOWS\system32\nls\ENGLISH;C:\MSSQL7\BINN;C:\Program Files\M
icrosoft SQL Server\80\Tools\BINN;c:\progra~1\VIAVOI~1;C:\Sun\AppServer\jdk\bin\;C:\Sun\AppSer
ver\bin;C:\Program Files\websm\bin;C:\eclipse;C\Perl\bin;

C:\temp>echo %CLASSPATH%

C:\temp>echo %JRE_LIB%
fred rosenberger
lowercase baba

Joined: Oct 02, 2003
Posts: 11814

i'm assuming you're getting a class file. from the directory where that class file is (probably you're c:/temp), do this:

java -cp . DooBee

There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14910

C:\temp>echo %CLASSPATH%

You don't have the current directory (".") in your classpath. When you try to run a Java program from the command line, Java will search for class files in the directories and JAR files that are in your classpath.

Add the current directory to your classpath:

set CLASSPATH=C:\Sun\AppServer\jdk\lib;C:\Sun\AppServer\jdk\jre\lib;.

Notice the ";." at the end.

(Note: If the CLASSPATH environment variable is not set at all, Java will look in the current directory by default).

You can also use the "-cp" (or "-classpath") option as Fred suggests, to set the classpath on the command line explicitly.
[ October 09, 2006: Message edited by: Jesper Young ]

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Derek B Smith

Joined: Oct 08, 2006
Posts: 9
that was it...thanks guys!

I agree. Here's the link:
subject: same error when using XP and Eclipse to run program
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