To build the jar file you need to: (1) download maven from http://maven.apache.org/download.html and unzip it somewhere (2) changedir into /path/to/MapFish/server/java/mapfish-geo-lib (3) launch the command /path/to/apache-maven-2.0.8/bin/mvn package This should create the jar file mapfish-geo-lib-0.1.jar.