My apologies about formatting - you've probably received my initial post,
which was posted in HTML format for some reason. I've corrected it shortly
after initial submission.

My code is solely based on the tutorial you've mentioned. However, it still
doesn't work. 

I guess the problem is in featureBuilder, probably something to do with my
featureType, which I extract from the existing shapefile. I am not sure what
featureBuilder.add(feature) does exactly though.

I'll post my code again just in case:

SimpleFeatureType featureType = featureSource.getSchema(); 

GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null); 
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(featureType); 

SimpleFeatureCollection collection = featureSource.getFeatures(); 

/* Irrelevant code here 
----------------------- 
*/ 

Point2D newPt = setPointByAzimuth(startingPointCoords, azimuth,
distance_to_next_point); 

Point pointToCollection = geometryFactory.createPoint(new
Coordinate(newPt.getX(), newPt.getY())); 

featureBuilder.add(pointToCollection); //not quite sure what this does 

SimpleFeature feature = featureBuilder.buildFeature(null);       

collection.add(feature); 

Thanks!




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