Java
Spring Boot for Beginners: Build, Understand and Test Your First Java REST API
Learn Spring Boot step by step with a complete Java REST API, validation, JPA, transactions, 28 passing tests, UML and BPMN diagrams.
Artificial Intelligence
Tesla’s New Roadster: Cold-Gas Thrusters, Physical AI and the Software Behind the Spectacle
Tesla’s new Roadster puts physical AI and software control boundaries in focus. What is confirmed, what remains unknown, and what a tested Java example can teach.
AI Business & Operations
The Solo Founder’s AI Company: What You Can Orchestrate Today
A solo founder can delegate substantial work to AI agents today. Here is how I would build a company around bounded jobs, overnight execution and evidence.
Blockchain-Technology
Building a Reorg-Safe Blockchain Explorer in Java
A blockchain explorer must explain changing history. Build a Java indexing core that handles reorgs, preserves observations and protects finalized checkpoints.
Best Practices
Your Telemetry Needs Tests: OpenTelemetry Contracts for Java
The payment provider fails. Your checkout counter keeps rising. The dashboard looks healthy. The trace contains a checkout span, but the payment call sits in another trace. And somewhere in the exception data, a customer email has slipped into your observability platform. The application may have passed its functional tests. Read more
Best Practices
Your Modular Monolith Needs an Architecture Test
A developer needs one more field for an order confirmation. The inventory module already has it, so they import a convenient internal class. The code compiles. The feature works. The boundary on the architecture diagram has just disappeared. That is a practical problem worth solving before splitting an application into Read more
Artificial Intelligence
Typed AI Decisions in Java: Make Uncertainty an Explicit Outcome
Research date: September 27, 2026. An architecture guide with an executable Java 21 example. A customer writes: “My payment failed, and now I cannot log in.” Should that ticket go to billing or technical support? A language model can suggest a queue, but your application still has to decide whether Read more
Artificial Intelligence
Spring AI 2.1: Your RAG Pipeline Needs an Embedding Contract
Engineering analysis — September 27, 2026. Based on the Spring AI milestone released September 25. An enterprise search application can accept every vector, return plausible results, and still be wrong. The dangerous case is not necessarily a malformed request. It is a successful import of vectors that belong to a Read more
Artificial Intelligence
GPT-6 Sol and Luna: Model Routing Is Now an Architecture Decision
GPT-6 Sol and Luna shift the question from which model is best to which model is justified for each task. Build a policy-driven router in tested Java.
Artificial Intelligence
AI Agent Harnesses: The Runtime Layer Enterprise Agents Now Need
AI agents need more than a model and tools. Learn how a runtime harness enforces limits, approvals and evidence, with a tested Java example.