Always when I try to run a Java Program a get this error:

<center>Exception in thread "main" java.lang.NoClassDefFoundError: <the class Name></center>

Thanks Gika

This error means that your classpath is not set up correctly.

Cheers

Martyn

ya, check with running the java/javac commands (without arguments) in the command line from an arbitrary path. If these commands are not recognized from all the paths, then your path variables have not been correctly set, and need to be done so.

Partho

If your program has not got the right 'main' method or has no the
'main' method this error will occur though you compile it well.

cheers

wujie

do sent some piece of code if u can. i believe a lot of member can help look into it.

Check the mismatch of case between the java program/class name and in the command prompt invoking name

like "HelloWorld.class" is the class name and java file name should be "HelloWorld.java"

and command line parameters of execution should be "java HelloWorld"

ext. java to Java may also produce this error

you don't set your classpath and path collectly ,in windows ,if your jdk is instanlled in c:\j2sdk1.4.0.you can set your path c:\j2sdk1.4.\bin;.
don't forget .it means your computer will find command in your
currently path .
then you set classpath refer to the class file you make .

Watch out for the package....of course after set your classpath and path collectly in autoexec.bat or under windows XP in Envoirement Variables
(wright click MyComputer\Properties\Advanced)