Well,
There's org.postgis.DriverWrapper.getVersion() {return "PostGisWrapper " + REVISION + ", wrapping " + Driver.getVersion();
https://github.com/postgis/postgis-java/blob/1102828ab6341ca59a7e610e8605f8b7b4530c3f/jdbc/src/main/java/org/postgis/DriverWrapper.java#L198
There are 9 other usages (https://github.com/postgis/postgis-java/search?utf8=%E2%9C%93&q=%22Driver.getVersion%22&type= )
Vladimir