This is a published version of the Tkrzw library for Java 8+, along with native libs that are automatically extracted at runtime.
The Java library is as unmodified as possible from the original Tkrzw, but a few changes were made to automatically extract the library at runtime, along with much improved double locking to prevent the library from being loaded multiple times.
Linux x64 native libs are compiled on Ubuntu 18.04, so you can be assured they'll work well on various flavors of linux going back several years in time.