Re: NoClassDefFoundError can't run class files

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.help

Date:

Fri, 11 Jun 2010 20:13:02 -0700

Message-ID:

<bXCQn.12381$3y2.3375@newsfe11.iad>

On 6/11/2010 7:06 PM, patrol wrote:

Hi,
I've installed the JDK. I created simple beginner programs of the
"Hello World" variety. I can compile successfully, but not run. I get
the following error:

java.lang.NoClassDefFoundError: c:/Users/John/Documents/AbsoluteJava/
C1/TotalCalsBurned
Caused by: java.lang.ClassNotFoundException:
c:.Users.John.Documents.AbsoluteJava.C1.TotalCalsBurned
    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)
Could not find the main class: c:/Users/John/Documents/AbsoluteJava/C1/
TotalCalsBurned. Program will exit.
Exception in thread "main"

I'm not using any fancy packages in my programs, so I don't know what
class it can't find. I've scoured Google without luck. Can anyone
offer a solution?
Thanks

You have to have the package and the directory of the source files the
same unless you use no package. So if you compile your program;

javac /c:/Users/John/Documents/Absolute Java/C1/TotalCalsBurned.java

then you need to have the package statement in TotalCalsBurned.java

package Users.John.Documents.Absolute Java.C1;

Then to run your program you need;

java Users.John.Documents.Absolute Java.C1.TotalCalsBurned

My guess would be that you don't have a package statement in your .java
file or it doesn't match the directory exactly. If you have no package,
you need to be in the C1 directory when you compile your program.

--

Knute Johnson
email s/nospam/knute2010/