Getting Exception while running a class file.

Hi,
I am able to compile .java file, but while executing the .class file, i am getting following exception.

Exception in thread "main" java.lang.NoClassDefFoundError: Example
Caused by: java.lang.ClassNotFoundException: Example
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
Could not find the main class: Example. Program will exit.

Please tell, what can be cause for this??

Your class needs to be in the classpath. If you are executing it from the same directory, then you can use "java -cp . Example" to tell the JVM that the current directory should be in the classpath.

Hey hi,

you must save your program with the same name as your class name.
if you are taking your class name as Test and while saving your writing test.java
program will compile without any error but while execution it will give such exception.

Cheers!

Swati Save wrote:
you must save your program with the same name as your class name.
if you are taking your class name as Test and while saving your writing test.java

This is not necessary. Its only needed if your class is coderanch. Just lookout for the class which contains main method. You should use the classpath switch -cp while running the class if you are getting such exception.

Swati Save wrote: . . . if you are taking your class name as Test and while saving your writing test.java
program will compile . . .

No it won't. Java is case-sensitive and will complain about the difference between test and Test.

Christophe Verré wrote:Your class needs to be in the classpath. If you are executing it from the same directory, then you can use "java -cp . Example" to tell the JVM that the current directory should be in the classpath.

Hi,
Here is the program,

public class Example {
public static void main (String args[]) {
System.out.println("This is a simple Java program.");
}
}

I have saved this file with name "Example.java". I am able to get "Example.class". But JVM is not running bytecode & giving that exception.
Can you please tell how to confirm, that Example class is in classpath or not??


Regards,
Vishu

Have you set a system CLASSPATH variable? What operating system are you using? Have a look at this "Common Problems" link, and use ctrl-F to find the error you are suffering. It tells you how to get rid of your CLASSSPATH (for the lifetime of the current command prompt). Does that help at all?

Campbell Ritchie wrote:Have you set a system CLASSPATH variable? What operating system are you using? Have a look at this "Common Problems" link, and use ctrl-F to find the error you are suffering. It tells you how to get rid of your CLASSSPATH (for the lifetime of the current command prompt). Does that help at all?

Hi,

Classpath is set to C:\Program Files\Java\jdk1.6.0_17\lib. OS is Windows XP. my class file is getting created at desktop, where i have kept my .java file.
So, you want to say that only classpath is causing this error. Right??

Regards,
Vishu
09988883238

Delete that CLASSPATH entirely. I presume you have your PATH set correctly otherwise you would have "javac is not recognized . . ." errors.

Then try again.

Campbell Ritchie wrote:Delete that CLASSPATH entirely. I presume you have your PATH set correctly otherwise you would have "javac is not recognized . . ." errors.

Then try again.

Hi,
It worked. Thanks

Regards,
Vishu

Well done, and "you're welcome"