Exception in thread

[ASP]

Okay, I'm brand spankin' new to Java, but not programming.

Here's a very simple application for which I am receiving an error.

public class CoolJava {

public static void main (String args[])
{
System.out.println("Java is Cool");
}

}

I have the Java 2 SDK, ver 1.3.1 installed on a Win2K platform. After installing it I adjusted the Windows path to include the ".../bin" directory; rebooted the computer.

The above was created in a text editor and saved as "CoolJava.java". I opened the command prompt and changed directories to that containing this file.

Next, I typed "javac CoolJava.java". It compiled to bytecode without a hitch, producing the file "CoolJava.class".

Finally, I typed "java CoolJava" to create the executable. Herein lies the problem. I received the following message.

"Exception in thread "main" java.lang.NoClassDefFoundError: CoolJava"

Argh. Why?

Your feedback is greatly appreciated.


Respectfully,

ASP

[javamaniac]

Hi,

Did you set your classpath as well? Here is an example of a path and classpath setting.

path=C:\Program Files\Java\j2sdk1.4.0_03\bin;
set CLASSPATH=C:\Program Files\Java\j2re1.4.0_03\lib\rt.jar;

This is almost definately the cause of the classnotfound exception.

Hope this helped.

Michael

[ASP]

Michael,

Thanks for you reply.

Well, although I did not make it clear, my intention was to deliberately avoid setting an environment variable for the Classpath.

It turns out I did a little more research and found a solution. Since I was keeping both the ".java" and ".class" files in the same directory, I only needed to identify the current directory for the source files.

So, for example...

javac <myFile>.java - compiles to Java bytecode

...and while in the same directory as the newly compiled file...

java cp . <myFile>.class

That worked.


Respectfully,

ASP