The best way would be to learn from one of the existing open source projects. You can start with sparkjava: https://github.com/perwendel/spark/ https://github.

The best way would be to learn from one of the existing open source projects. You can start with sparkjava: https://github.com/perwendel/spark/ https://github.com/perwendel/spark/ Also, multi-threading, I/O and networking are areas that you would need to understand inside out.