PraxisLIVE is an open-source hybrid-visual IDE for live programming, built on top of the NetBeans platform. While the IDE is primarily aimed at creative coders, its underlying forest-of-actors runtime supports real-time coding Java in general. PraxisCORE brings aspects of Erlang, Smalltalk and Extempore into the Java world, providing a powerful platform for media processing, data visualisation, sensors, robotics, IoT, and lots more! We will explore some of the trials and tribulations of designing a just-in-time programming system in Java, including actors, classloaders and reactive dataflows, with the aid of some hypnotic visuals and bleepy sounds.