Question: I am not very experience with java and this is driving me crazy. I wrote a java program `FileManagement` and I need to run it from the command line.

I can compile it from the command line with `javac FileManagement/*.java` which will create all the classes in that folder but when I try `java FileManagement.Main` it says :

> 
> Exception in thread "main" java.lang.NoClassDefFoundError:
>  FileManagement/Main
> 
> 
> 

The thing is that I have tried this same procedure in a remote computer and it is working fine. It is not working on mine.

Answer: 
If your `Main` class is in a package called `FileManagement`, then try:

```
java -cp . FileManagement.Main

```

in the parent folder of the `FileManagement` folder. 

If your `Main` class is not in a package (the default package) then *cd* to the `FileManagement` folder and try:

```
java -cp . Main

```

More info about the CLASSPATH and how the JRE find classes:

* [How Classes are Found](http://download.oracle.com/javase/6/docs/technotes/tools/findingclasses.html)
* [Setting the class path (Solaris/Linux)](http://download.oracle.com/javase/6/docs/technotes/tools/solaris/classpath.html)
* <http://en.wikipedia.org/wiki/Classpath_(Java)>
What is the package name of your class? If there is no package name, then most likely the solution is:

```
java -cp FileManagement Main

```