java.lang.NoClassDefFoundError

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yawnmoth - 28 Nov 2005 04:06 GMT

I'm recieving an Exception in thread "main"
java.lang.NoClassDefFoundError: Test and am not really sure why. I'm
able to compile the file - Test.java - just fine, with javac, however,
when I try to run it, with java, I can't. The contents of Test.java
are as follows:

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

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Benji - 28 Nov 2005 04:15 GMT

> I'm recieving an Exception in thread "main"
> java.lang.NoClassDefFoundError: Test and am not really sure why. I'm
> able to compile the file - Test.java - just fine, with javac, however,
> when I try to run it, with java, I can't. The contents of Test.java
> are as follows:

> public class Test
> {
[quoted text clipped - 3 lines]
> }
> }

How are you trying to run it?

I have a feeling your CLASSPATH is set to something and doesn't include ".".

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Of making better designs there is no end,
and much refactoring wearies the body.

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IchBin - 28 Nov 2005 04:33 GMT

> I'm recieving an Exception in thread "main"
> java.lang.NoClassDefFoundError: Test and am not really sure why. I'm
[quoted text clipped - 9 lines]
> }
> }

You have to execute the class with the correct class name... Example
there is a difference between *test* and *Test*

*C:\java test*
Hello world

*C:\java Test*
Exception in thread "main" java.lang.NoClassDefFoundError: Test (wrong
name: test)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

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Thanks in Advance...
IchBin, Pocono Lake, Pa, USA
http://weconsultants.servebeer.com/JHackerAppManager
__________________________________________________________________________

'If there is one, Knowledge is the "Fountain of Youth"'
-William E. Taylor, Regular Guy (1952-)

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IchBin - 28 Nov 2005 04:40 GMT

>> I'm recieving an Exception in thread "main"
>> java.lang.NoClassDefFoundError: Test and am not really sure why. I'm
[quoted text clipped - 32 lines]
> at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

Sorry I forgot to mention this. Please, *as a beginner*, post your
questions to c.l.j.help and not this group c.l.j.programmer. An look at
you messages closer. It actually tells you what the problem is.

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yawnmoth - 28 Nov 2005 05:00 GMT

> >> I'm recieving an Exception in thread "main"
> >> java.lang.NoClassDefFoundError: Test and am not really sure why. I'm
[quoted text clipped - 12 lines]
> > You have to execute the class with the correct class name... Example
> > there is a difference between *test* and *Test*

Wouldn't java Test be correct, in this case, since the name of the
class is Test and not test? In any case, I tried both, and recieved
the same error for each one.

> Sorry I forgot to mention this. Please, *as a beginner*, post your
> questions to c.l.j.help and not this group c.l.j.programmer. An look at
> you messages closer. It actually tells you what the problem is.

I'll keep that in mind next time. Thanks for the tip.

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Roedy Green - 28 Nov 2005 17:17 GMT

>Wouldn't java Test be correct, in this case, since the name of the
>class is Test and not test? In any case, I tried both, and recieved
>the same error for each one.

There is no way you would get the SAME error, perhaps a similar error.
In computing, even every comma counts. Please don't paraphrase error
messages.

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Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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Pszemus - 28 Nov 2005 20:37 GMT

>>>>I'm recieving an Exception in thread "main"
>>>>java.lang.NoClassDefFoundError: Test and am not really sure why. I'm
[quoted text clipped - 22 lines]
>
> I'll keep that in mind next time. Thanks for the tip.

Maybe it's to obvious, but worth trying for a beginner: Before
executing (java Test), compile (javac Test.java). :-)

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Pszemus
-==[ GG: 1620292 ]==-
-==[ www: www.sarm.w.pl ]==-
-==[ e-mail: pszemus@o2.pl ]==-

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java.lang.NoClassDefFoundError

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