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error in executing executable jar (urgent......)

Yogesh Gaikwad
Posts: 15
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I created one application and made a jar file for that using following command

jar cmf mainClass.txt jarFileName.jar packageName

The mainClass contain one line only which is -

Main-Class: psae.HelloWorld

This jar file work fine on dos prompt using following command

java -jar jarFileName parameter(if required)

But the problem is when i double click on jar file for executing the file it gives me an error like

"Fatal Exception Occured : Program will exit"

I change some setting for jar file from explorer but it wasn't work

plz reply me its urgent.............
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