Hi Shaji,
Your jar file structure should look like:
META-INF/
META-INF/MANIFEST.MF
excel/
excel/action/
excel/action/ExcelActions.class
excel/action/ExcelConfigurationDialog.class
catalog.xml
all bundled up as XYZ.jar
Then XYZ.jar and main.jar should be bundled up as a jar or a zip say ABC.zip.
If you unzip ABC.zip you should see XYZ.jar and main.jar.
Regards,
Anushree