The source code is provided in the form of an Eclipse project. Compiling the source without Eclipse is possible but not recommended, as the following instructions can only be reproduced if Eclipse is installed.
Download the source code, decompress it and import the directory into your Eclipse workspace.
Before you can compile the project you have to adjust the path to the Maple resource files. You have to change the path to the libraries jopenmaple.jar and externalcall.jar, which reside in your Maple directory in the java subdirectory. You have to use your own as these files are copyrighted.
You can now run your application inside Eclipse or create a jar file containing all required files. For further information about these tasks, please have a look at the Eclipse documentation.