Good morning,
I believe that the Longitude of Origin is actually the Central Meridian
parameter. So somewhere in your code when you set up your parameters, make
sure you set the central meridian value as your value.

I found this link:
http://www.remotesensing.org/geotiff/proj_list/mercator_2sp.html

Looks like the required parameters are: 
- "standard_parallel_1" : the Latitude of first standard parallel, unit:
angular (radian i believe)
- "latitude_of_origin": the Latitude of natural origin, unit: angular
(radian I believe)
- "central_meridian": the Longitude of natural origin, unit: angular (radian
~me)
- "false_easting": False Easting
- "false_northing": False Northing

This is what I think how to set up the parameters (in my theory :) I am
still testing with UTM)

try {
                MathTransformFactory mtFactory =
ReferencingFactoryFinder.getMathTransformFactory(null);
                ParameterValueGroup parameters =
mtFactory.getDefaultParameters("Mercator_2SP");
                parameters.parameter("standard_parallel_1").setValue( <some
value here>  );
                parameters.parameter("latitude_of_origin").setValue( <some
value here> );
                parameters.parameter("central_meridian").setValue( <some
value here> );
                parameters.parameter("false_easting").setValue( <some value
here> );
                parameters.parameter("false_northing").setValue( <some value
here> );
               
                // TODO: set up the math transform and do transform

} catch (NoSuchIdentifierException e) {
                e.printStackTrace();
}

I hope this helps.
~jle

Note to myself: http://www.remotesensing.org/geotiff/proj_list/

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