JUnit 6
Complete guide to JUnit 6 with links to all articles covering getting started, core patterns, advanced techniques, mocking, extensions, integration testing, and best practices.
20 AI Prompts for Java Concurrency and CompletableFuture
20 copy-paste AI prompts for Java concurrency and CompletableFuture — from basics to advanced production patterns and debugging. Covers thread pools, ExecutorService, CompletableFuture chaining, fan-out/fan-in, timeout handling, virtual threads, deadlock diagnosis, thread dump analysis, and full concurrency audits.
8086 Interrupt System: IVT, ISR Writing, and Hardware Interrupts
The 8086 interrupt system: IVT layout at 00000h-003FFh, the six-step hardware acknowledgment sequence, writing correct ISRs with register save/restore/EOI/IRET, vector installation via DOS INT 21h, and a complete worked timer ISR example.
8086 Flag Register: All 9 Flags, Conditional Jumps, and Critical Traps
All 9 flags of the 8086 flag register explained: CF, PF, AF, ZF, SF, OF (status) and TF, IF, DF (control) with exact set/clear conditions, the CF vs OF unsigned/signed distinction, the four traps that catch every beginner, and a complete conditional jump reference.
8086 Stack Operations: SS:SP, PUSH/POP, CALL/RET, and Stack Frames
The complete 8086 stack reference: SS:SP model, byte-level PUSH/POP mechanics, near and far CALL/RET, stack frame setup with BP for parameters and locals, and the INT/IRET stack protocol.
8086 Addressing Modes: EA Calculation, String Instructions, and REP Prefixes
Complete 8086 addressing modes reference: all 9 modes with EA formulas, default segment rules, clock-cycle costs, the [BX+SI] vs [BX+DI] timing asymmetry, and all five string instructions (MOVS, CMPS, SCAS, LODS, STOS) with REP/REPE/REPNE, auto-adjustment table, and worked examples.
8086 Microprocessor Architecture: BIU, EU, Pipeline, Pin Diagram, and I/O
How the Intel 8086 splits work between the Bus Interface Unit (BIU) and Execution Unit (EU) to create a two-stage pipeline, with the complete 40-pin signal reference (minimum and maximum mode), T-state bus cycle timing, even/odd memory banks, and the full I/O subsystem including 8255 PPI, 8259 PIC, and 8253 timer.
Serverless AI Inference in Java: AWS Lambda vs Azure Functions vs Cloud Run
A hands-on comparison of serverless Java AI inference on AWS Lambda, Azure Functions, and Google Cloud Run — with real benchmark data, cost tables, a clear winner recommendation, and code you can run.
Spring Boot 3 to 4 Migration Guide: What Actually Breaks, Why It Breaks, and How to Fix It
A practical Spring Boot 3 to 4 migration guide covering the real Java baseline, starter modularization, Jackson 3 as the default JSON library, Spring Security 7 defaults, virtual threads, testing breakage, and production pitfalls that most tutorials skip entirely.
Spring Boot 4 HTTP Service Clients: Build REST Clients with Just an Interface
A complete, hands-on guide to HTTP Service Clients in Spring Boot 4 and Spring Framework 7. Learn how to replace RestTemplate and manual WebClient boilerplate with declarative @HttpExchange interfaces, configure service groups via @ImportHttpServices, set per-group timeouts and base URLs with application.properties, test with @RestClientTest, and migrate from OpenFeign — with fully annotated production-grade code and sample output.