Hi Oliver,

> Is there a way in geotools to create a Layer in the MapContext and put a
> Graphic(rectangle etc.) on it?
>

Not that I know of. If the graphic is a polygon you could create an
in-memory feature collection with the graphics represented as JTS
Polygons and add this as a layer.  For graphics that are more complex
but small you might consider displaying them as feature labels
(perhaps for invisible point features).

Hope this helps.

Michael

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