Master Logback RollingFileAppender with time-based, size-and-time, and fixed-window rolling policies. Includes production-ready logback.xml examples, Spring Boot integration, async logging, and a complete FAQ.
Learn how to mask credit card numbers, SSNs, API keys, and other PII in Logback logs using a custom MaskingConverter, PatternLayout, and logback.xml configuration — with annotated Java code and practical best practices.
A complete implementation of a semantic search engine in pure Java — no external libraries. Covers TF-IDF vectorisation, cosine similarity, and document ranking by meaning. Explains the mathematics behind vector embeddings, how they power RAG and AI search systems, and provides a working query engine with annotated code and sample output. The same architecture used by Pinecone, Weaviate, and Elasticsearch — built from scratch.
A complete, from-scratch implementation of a feedforward neural network in pure Java — no TensorFlow, no DL4J, no external libraries. Covers the Neuron model, forward propagation, sigmoid activation, backpropagation with gradient descent, and trains the network to learn the XOR function. Every line of code is annotated with the underlying mathematics so you understand exactly what the network is doing at each step.
A complete beginner's guide to building a REST API with Spring Boot 3. Covers project setup, clean package structure, a Java record model with Bean Validation, a service layer, a @RestController with GET/POST/PUT/DELETE endpoints, global exception handling with @RestControllerAdvice, and end-to-end curl testing u2014 with fully annotated code throughout.
A complete, reference-level guide to the Java Collections Framework. Covers ArrayList vs LinkedList, HashSet vs LinkedHashSet vs TreeSet, HashMap vs LinkedHashMap vs TreeMap, PriorityQueue, ArrayDeque, and immutable collections u2014 with time-complexity tables, annotated code examples, and a decision guide for choosing the right data structure.
A complete, reference-level guide to the Java Streams API (Java 8+). Covers stream creation, intermediate operations (filter, map, flatMap, sorted, distinct, peek), terminal operations (collect, reduce, count, findAny, anyMatch), collectors, parallel streams, and the most common pitfalls u2014 with fully annotated code and sample output for every example.
A complete guide to handling the 8086 external timer interrupt INT 08h. Covers the interrupt vector table, how the CPU dispatches interrupts, saving and restoring the original BIOS handler, writing a far ISR that increments a tick counter, chains correctly, and exits safely — with a common-mistakes table.
A complete guide to 8086 assembly stack operations. Covers how the stack works (SP, SS, LIFO), what PUSH and POP do to memory, how CALL saves a return address and RET retrieves it, and a fully annotated working program that demonstrates all four instructions together.
A complete guide to TypeScript function parameters: rest (...args), optional (?), and default (=) parameters. Covers syntax rules, annotated code examples, common mistakes, and a real-world combined example — everything a TypeScript developer needs to write flexible, self-documenting functions.