A hands-on comparison of Java virtual threads (Project Loom) against platform threads — with a 28× I/O benchmark, CPU-bound proof, memory comparison table, HttpClient real-world example, architecture diagram, and a decision table for when NOT to use virtual threads.
A step-by-step Java 21 to 25 upgrade guide: Maven and Gradle files, Lombok and Mockito versions, removed and warned APIs, a 12-item checklist and seven AI prompts. Every claim was run on JDK 21, 25, 26 and 27, and the old guide's mistakes are corrected.
A practical cookbook for the Java Stream API and Collectors utility — filter/map/reduce essentials, groupingBy and partitioningBy patterns, performance gotchas, and AI prompts to refactor legacy loops into clean pipelines.
A practical walkthrough of Java's three classic concurrency tools — ExecutorService, CompletableFuture, and ForkJoinPool — with runnable examples, guidance on when to use each, and AI prompts for refactoring legacy concurrent code.
A practical guide to the modern Java test stack — JUnit 6 as the runner, AssertJ for fluent assertions, Mockito 5 for mocking, and Testcontainers for real infrastructure. Includes runnable examples for each and AI prompts to generate and refactor tests.
A copy-paste playbook of AI prompts for migrating Java codebases between every LTS jump: 8→11, 11→17, 17→21, and 21→25. Use them in Claude, ChatGPT, Gemini, or Cursor to automate the repetitive parts of a version upgrade.
Adding two integers looks trivial until the sum overflows silently. This guide covers five quick ways to add, then goes deep: the wraparound reproduced with real numbers, Math.addExact and the exact-arithmetic family, widening to long, BigInteger, and the bit trick addExact itself uses.
Learn how to configure Java RMI and Hessian remoting in Spring Boot 2 with RmiServiceExporter, HessianServiceExporter, and their proxy factory beans. Includes server and client configuration, shared interface setup, and a comparison table.
Learn how to add JSONP support to Jersey JAX-RS REST APIs using the @JSONP annotation and a manual callback wrapper. Includes curl testing, browser script-tag usage, XSS security validation, and a JSONP vs CORS comparison.
Compare Maven Shade Plugin fat JARs, Spring Boot executable JARs, and jpackage native installers — with full Maven configurations, build commands, a side-by-side comparison table, and pitfall guide.