Running a java program

[Java2]

I have managed to succesfully compile the following java program and it has created the class file correctly.

However when I try to run the program DOS comes up with this error.

Exception in thread "main" java.lang.NoClassDefFoundError: then the file name

this is the code of the main file

public class Hello 
{
  public static void main (String[] args) 
  {
    System.out.println("Hello World");
  }
}

[redhead]

Have you checked the documentation, specificaly the part about case sensitivity

Be Careful When You Type

Type all code, commands, and file names exactly as shown. The Java compiler and interpreter are case-sensitive, so you must capitalize consistently.

Hello not equal hello

Suns forum reveals there might be an error in your $CLASSPATH setting, since some have had the exact same probelm.

[Java2]

sorry being new to all this, could u explain how i can change the classpath name

[Belisarius]

If you're using Windows, it depends on the version of Windows you're using. In XP, you can right-click on My Computer and select Properties. Click on the Advanced tab and at the bottom hit the button labeled "Environmental Variables". "CLASSPATH" should be listed under "System variables". Be sure to include "." in your classpath, as that can often be the source of "NoClassDefFound" errors.

In Windows, the CLASSPATH is broken up with semi-colons for each directory you wish to include.

[Java2]

A few path names was thrown around in that forum. so wot do i need to put in it and where will i need to save my java files.

[teknomage1]

Maybe Malcolm's link about setting up his cutter code editor could give you some pointers. http://fundza.com/cutter/installation/installation.html

[Belisarius]

Originally Posted by Java2

A few path names was thrown around in that forum. so wot do i need to put in it and where will i need to save my java files.

You need "." so as to be able to run it from *anywhere*.

[Java2]

Ok, i have added a "." into the class path (i think anyway, unless i have got this entirely wrong) there is a link to my below. any mistakes please point it out.

http://i14.photobucket.com/albums/a3...7/untitled.jpg

then just copy the image and paste it into a new application, it should appear more clear.

[redhead]

Thats the $TEMP variable you're editing there.. It has nothing todo with $CLASSPATH.

[Java2]

ok, so how do i chage the classpath to "."

[redhead]

Follow the directions given by Belisarius, if theres no system variable named CLASSPATH, then create a new one and fill in the "." aswell as your location of your java installation ie: c:\program files\java\jdk1.5.0\bin\;.;%CLASSPATH%;

[Java2]

Ok its been created still hasn't work.

as before here is a link to the screenshot

http://i14.photobucket.com/albums/a3...2ndattempt.jpg

[Belisarius]

For the record, "c:\program files\java\jdk1.5.0\bin\" isn't useful in the CLASSPATH - it doesn't contain any Java classes.

Here's what I need to help you - I need screenshots of the following:

- Your source code (I want an actual screen shot, not a cut and paste).
- A directory listing of the code you're trying to run. (Type 'dir' in the cmd window. If the listing is too long for the window, create a new directory and move your code there).
- A compile and an attempt to run the program. Include an 'echo %CLASSPATH%' as well.

[Java2]

Ok this should be all you need

http://i14.photobucket.com/albums/a3...mandPrompt.jpg

http://i14.photobucket.com/albums/a3...SourceCode.jpg

thanks for your help

[Belisarius]

Don't use the full path when running the Java program, just run "java Hello".