Hello i'm new here on this forum so excuse me if i do something wrong.

I have a question for a time i program in java my first real project is at a beta fase but when i compile him to an jar file and run him with the following :
java -jar project.jar

i get an error (This one):

java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
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)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at Reparatie.Main.<init>(Main.java:34)
at Reparatie.Main.main(Main.java:46)

I use an mysql driver manager (mysql-connector-java-3.1.12-bin.jar).
I program in Netbeans IDE 4.1

But i don't know why i get this error when i run my program in netbeans he runs correctly.

Can anyone help me please ! :(

If you need some code to help please ask...

Greetz ,

Pielie