Flakeynetworks Java API is a simple wrapper library for vMix’s web API designed to speed up development time in Java and removing the need to lookup the specific API in the vMix documentation and troubleshooting.
The library is simple to use, you can run transition in as little as three lines:
VMixHost host = new VMixHost();
VMixCommand command = new TransitionFade(1000);
boolean success = host.runCommand(command);
The library does require that the web controller is enabled in the settings.