Here I post a sample java class I developed some months ago, working with geometry creation in GeoTools 2. This class, given an input shapefile, will elaborate an output shapefile merging the input polygons on a common field.
Geotools is an open source (LGPL) Java code library which provides standards compliant methods for the manipulation of geospatial data, for example to implement Geographic Information Systems (GIS). The Geotools library implements Open Geospatial Consortium (OGC) specifications as they are developed, in close collaboration with the GeoAPI and GeoWidgets projects. The capabilities of Geotools are presented in the feature list.
