GeoServer is now able to output maps that look like continuous wrapped maps from Google!
Let’s have a look at an example. Below is a map drawn by GeoServer that is reprojected to a projection that happens to sit across the dateline, the usual “edge” of the map. As you can see the reprojection is not doing a good job where the dateline is crossed:
However, GeoServer now has what is called advanced projection handling. With this enabled, the dateline wrapping is properly handled and, in addition, the map repeats in a continuous fashion:
For more information, including how to turn on this (optional) feature, please see this post from GeoSolutions.