...Currently, JxMake's loadable libraries (build scripts) are primarily designed for non-OS MCU systems and experimental use. Full support for building desktop applications is planned for future development.
Building JxMake requires Java SDK 8 or later (note that Java SDK 8 is a Long-Term Support version).
...Version 1.5 Tutorial Video
http://youtu.be/EkLRJiqoE_o
Note, version 1.5.2 has just been released (tarball) which includes an important bug fix. Before, holding down a key repeats the key, now the application only receives a single key when a key is held down.