Scaling Architecture, Not Hardware: Building a Multi-Threaded NIO Web Server from Scratch in Java

Short summary

A detailed tutorial on building a multi-threaded Non-Blocking I/O (NIO) HTTP server in Java from scratch. Explains why blocking I/O doesn't scale with more hardware, then covers channels, buffers, selectors, and concurrency challenges. Not AI-related — focused on systems architecture and Java networking fundamentals.

• •Blocking I/O wastes threads on idle connections; NIO uses a selector-based event model
• •Covers ServerSocketChannel, ByteBuffer management, and non-blocking reads/writes
• •Part 2 of a series on building an HTTP server from raw Java sockets

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