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10.22.2004 at 02:34PM PDT, ID: 21179400
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8.0

Exception in thread "main" java.lang.NoClassDefFoundError - Java2sdk1.4.2_06

Asked by tebacher in Java Programming Language

Tags: ,

I've obviously a newbie to java, *ATTEMPTING* to teach myself, but I've run into a problem that's really held me up.

As you can see below, I'm attempting to run a java application called "helloworldapp".  helloworldapp.class (and .java) is located in c:\j2sdk1.4.2_06\bin\helloworldapp.
It compiles just fine but will not run.  I think there may be a classpath problem, but I've changed the path a ton of times and can't get it right.

_________________________________

C:\j2sdk1.4.2_06\bin\HelloWorldApp>javac helloworldapp.java

C:\j2sdk1.4.2_06\bin\HelloWorldApp>java helloworldapp
Exception in thread "main" java.lang.NoClassDefFoundError: helloworldapp (wrong
name: HelloWorldApp)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)

C:\j2sdk1.4.2_06\bin\HelloWorldApp>dir
 Volume in drive C has no label.
 Volume Serial Number is 549D-DF6C

 Directory of C:\j2sdk1.4.2_06\bin\HelloWorldApp

10/22/2004  03:46 PM    <DIR>          .
10/22/2004  03:46 PM    <DIR>          ..
10/22/2004  04:17 PM               432 HelloWorldApp.class
10/22/2004  03:59 PM               157 HelloWorldApp.java
               2 File(s)            589 bytes
               2 Dir(s)   3,418,599,424 bytes free
_____________________________________

Running WinXP SP2, and here's what I have for my environmental variables:

User variables:
CLASSPATH - .;C:\j2sdk1.4.2_06\bin
PATH - .;C:\j2sdk1.4.2_06\bin

System variables:
CLASSPATH - .;C:\j2sdk1.4.2_06\lib\tools.jar;C:\j2sdk1.4.2_06\jre\lib\rt.jar;C:\j2sdk1.4.2_06\jre\classes
JAVA_HOME - c:\j2sdk1.4.2_06
Path - %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\NMapWin\\bin;"C:\Program Files\Symantec\Norton Ghost 2003\";C:\j2sdk1.4.2_06\bin;JAVA_HOME;

I found many instances of this issue here and elsewhere and have tried most of their suggestions, and now I'm afraid I may have just completely messed it all up!

Please help!Start Free Trial
[+][-]10.22.2004 at 02:35PM PDT, ID: 12385398

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[+][-]10.22.2004 at 02:40PM PDT, ID: 12385428

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Zone: Java Programming Language
Tags: thread, exception
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Solution Provided By: CEHJ
Participating Experts: 11
Solution Grade: A
 
 
[+][-]10.22.2004 at 02:42PM PDT, ID: 12385438

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