Programming Language

Programming Language

Jason Yang · 22 Mar, 2026

When to use HashSet, LinkedHashSet, or TreeSet in Java: their differences explained simply, and how they map to Python's set, dict, and sorted().

Programming Language

Jason Yang · 08 Jan, 2026

FastAPI vs Spring Core: how Python and Java differ on DI, singleton scope, resource lifecycle, and execution models — a practical developer comparison.

Programming Language

Jason Yang · 08 Jan, 2026

FastAPI dependency injection is a request-scoped resource engine, not just object passing. Covers lifecycles, dependency chains, testing, and clean architecture.

Programming Language

Jason Yang · 08 Jan, 2026

The Python Singleton pattern ensures one instance per process. Here are the Pythonic ways to do it (module-level, decorator, metaclass), plus thread safety and when not to use it.

Programming Language

Jason Yang · 01 Jan, 2026

Lombok's @Builder ignores your field defaults — use @Builder.Default or final to keep them. Here's why it happens and how to fix it.

Programming Language

Jason Yang · 02 Dec, 2025

Add a gRPC endpoint to a Spring Boot order-service: define .proto files, generate stubs, implement the RPC logic, and expose a new CreateOrder API.

Programming Language

Jason Yang · 30 Nov, 2025

Pydantic vs dataclass: use Pydantic to validate incoming data, dataclasses for internal structures. Real examples and where each one breaks.

Programming Language

Jason Yang · 29 Nov, 2025

Exception logging in Java done right: catch errors in the correct layer, log them once, and keep clear context — practical patterns for real systems.

Programming Language

Jason Yang · 29 Nov, 2025

Design effective custom exceptions in Java: structure them well, separate business and system errors, and integrate cleanly with Spring Boot error handling.

Programming Language

Jason Yang · 28 Nov, 2025

Why real Spring Boot developers prefer unchecked exceptions over the textbook rules — modern exception-handling patterns for clean, maintainable service code.

Programming Language

Jason Yang · 27 Nov, 2025

Understand Java's Throwable hierarchy — Error vs Exception, checked vs unchecked, and RuntimeException — to write safer error handling in production apps.

Programming Language

Jason Yang · 17 Nov, 2025

Manage FastAPI projects with Poetry: project setup, dependency locking, virtual environments, and testing — the full pyproject.toml workflow for teams.

Programming Language

Jason Yang · 17 Nov, 2025

Migrating Pydantic v1 to v2 in a FastAPI project? Here's the full v1→v2 checklist plus the validator, settings, and config changes that break.

Programming Language

Jason Yang · 14 Nov, 2025

Checked exceptions are enforced by the Java compiler; unchecked ones aren't — here's the difference, with the class hierarchy, code examples, and when each applies.