Exception in thread "main" java.lang.NoClassDefFoundError

[bhupal4all]

Hi,

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

> javac Demo.java
compilied successfuly and class file got generated.

> java Demo
Then i am getting
"Exception in thread "main" java.lang.NoClassDefFoundError".

I set java/bin folder in path variable.

Could you tell me why am i getting this error and how can I solve this?

[Eranga]

After the compilation check that Demo.class file is created or not in the same location of your source file is located.

Did you working on any Java IDE?

[bhupal4all]

No, I am not working on IDE. I have checked for class file. Its is there in current directory. But i am not able to run it.

[Eranga]

Other than that in the code there is no any issue also, so it must run well. Just type javac and see what happen on the command prompt, I hope you are working on Windows platform.

[bhupal4all]

Yes, I am working on Windows Vista. I compiled it, but I didnt get any error.
When I use 'javap', it is showing the content properly.

[masijade]

If you are in the same directory as your class file (and it does not have a package) then you need to include "." (current directory) on your classpath

java -cp . Demo

[sagarbirari]

IN Environment variable CLASSPATH add (.) means current working directory
like this
your_prev_path;.;

Regards

[Norm]

Here's what I get when I execute the java command with a non existant class file:

D:\JavaDevelopment\Testing>dir asdf
Volume in drive D is Work
Volume Serial Number is 1463-F5AE

Directory of D:\JavaDevelopment\Testing

File Not Found

D:\JavaDevelopment\Testing>java asdf
Exception in thread "main" java.lang.NoClassDefFoundError: asdf

part of the error message includes the class name. You left that part off your post.
Can you try executing the dir command followed by java command then copy and paste the output here?

[Eranga]

Anyway that class file is missing in the location he/she run the code. As far as I know that's the only situation where NoClassDefFoundError come across.

[hemadri.niit]

HI...
WHEN JVM CANNOT ABLE TO FIND THE .class file . THEN WE WILL GET THIS ERROR .."Exception in thread "main" java.lang.NoClassDefFoundError".SO WHILE EXECUTING i mean to say drive_name java class file name...checkout drive name or folder name...etc

[Eranga]

In compilation *.class file is created in the same file *.java file located. Unless you change the working folder on the command prompt after compilation, it don't effect to this exception anyway.

[manish_gupta21]

Hi ,

what is mentioned by masijade is working fine ie. java -cp . filename

is working in command propmt of windows. This is because my .java and .class files are in the same directory.

Thanks and Regards,
Manish Gupta

[pbrockway2]

Thanks for the confirmation and the lengthy consideration.

Closing the thread.