NoClassDefFoundError...plz help!!

HI All
Iam working ona struts application which uses a jar file. I am using eclipse ide and added the external jar file to the build path. When I am trying to access one of the classes of the jar file it is giving "NoClassDefFoundError". When I am writing the source code in the ide, all the methods and variables are displayed when I press a dot after that class object. so I think, that the class is available for access, but when I run it, its not working. I have written a normal java class for the same in which I have declared every function as static and when I ran it its working fine. But when I am using it in struts using the eclipse ide, its generating the NoClassDefFoundError.
Plz help me..

Thanks sar.h,
you are right!!. I didn't add the external jar into the lib folder, I only added to the external jar files to build path. But when I copied it into the lib folder, its working. But still I am unable to understand, why only that particular class was not accessed, as rest of them all were accessed without copying it into the lib folder. still I'm confused.. anyhow thanks for your help.

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Sabin shrestha
[email protected]
Kathmandu Nepal

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