eclipse exporting project having extarnal jars as libs

Hi there

i have done a java project on eclipse , i have used some extarnal jar
files as lib in my project added them by (right click on my project
folder --> properties --> java build path --> libraries --> add
external jars) i also checked on them in
(right click on my project folder --> properties --> java build path
--> order and export)

but when i export my project to executable jar file ( i get the file)
but cant run it

on double click it says (could not find main class) while i have
defined the correct main class in the exporting wizard,

i also tried to extract the jar file and didnt found any of my external
jar libs in it so how can i give this file to my users without making
them download the libs themselves

i need your help please

.

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