Very simple example of overloading Java with threads. Platform threads use OS threads and will hit issues spawning new threads at a certain amount of load. Virtual threads are part of Project Loom and are Java's take on green threads. They avoid the issue, but require significant extra complexity in Java.
See Server.java for config options. All should be self-explanatory. Two methods are provided. One, runServer is a
realistic scenario where this might occur, but can be difficult to trigger on your own. The other, loadTest is
provided for easily reproducing the error.
To run: java Server.java. Requires Java 21.