ClassNotFoundException

**lgpublic** · 04-23-2010, 03:43 AM

Hi,
I use a open source package in my program. The package is in a jar file. I use -classpath to import the jar file when compiling it and it works well. But when I execute it I meet the ClassNotFoundException exception and the class not found is the class in that jar file. I set the classpath environment variable and it seems working well. However, when I pack my program into jar file, I meet the exception again. This time I cannot figure how to make it run successfully. Any ideas?

**Webuser** · 04-23-2010, 05:36 AM

What IDE do you use?

**Tolls** · 04-23-2010, 10:09 AM

What does the MANIFEST look like in your jar file?

**lgpublic** · 04-23-2010, 02:09 PM

Originally Posted by Webuser

What IDE do you use?

Well, I didn't use any IDE. Just gedit.

**lgpublic** · 04-23-2010, 02:11 PM

Originally Posted by Tolls

What does the MANIFEST look like in your jar file?

Wow, there is no MANIFEST. I will try it again.

**Tolls** · 04-23-2010, 03:05 PM

And the MANIFEST will say where the other jar should be deployed (usually relative to your app's jar)...as well as the main class. Which begs the question of how you managed to run it? It contains the name of the main class file.