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There is no (good) reason to limit yourself to points, you can see if your buffer intersects with the countries directly:

public SimpleFeatureCollection lookup(Geometry g, SpatialIndexFeatureCollection countries) {
    GeometryFactory gf = new GeometryFactory();
    
    Filter f = ff.intersects(ff.property("the_geom"), ff.literal(g));
    ret = countries.subCollection(f);
    
    
    return ret;
}

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