4.1. System requirements¶

The 3D City Database WFS is implemented as Java web application based on the Java Servlet technology. It therefore must be run in a Java servlet container on a web server. The following minimum software requirements have to be met:

Java servlet container supporting the Java Servlet 3.1 / 3.0 (or higher) specification
Java 8 Runtime Environment (Java 7 or earlier versions are not supported)

The WFS implementation has been successfully deployed and tested on Apache Tomcat 9 (http://tomcat.apache.org/). This is also the recommended servlet container. Apache Tomcat 8 and 7 are also supported, whereas any previous version of the Apache Tomcat server will not work.

Note

Neither Java nor a servlet container are part of the WFS distribution package and therefore must be properly installed and configured before deploying the WFS. Please refer to the documentation of your favorite servlet container for more information.

Hardware requirements for the web server running the WFS depend on the intended use and number of concurrent accesses. There are no minimum requirements to be met, so make sure your system setup meets your needs. Also note that the WFS does not provide its own security layer (e.g., to limit access to specific networks or users). So, it is your responsibility to take any reasonable physical, technical and administrative measures to secure the WFS service and the access to the 3D City Database.

WFS clients connecting to the WFS interface of the 3D City Database must support the OGC WFS standard version 2.0. Moreover, they must be capable of consuming 3D data encoded in CityGML or CityJSON, which is delivered by the WFS server.