Common Java Backend Code Smells and Bugs: Real‑World Cases and Fixes
The article presents a collection of typical Java backend coding mistakes—ranging from misused ternary operators and poor parameter validation to logging pitfalls, dead code, improper exception handling, AOP self‑invocation issues, Redis resilience problems, and Excel file upload bugs—along with concrete examples, images, and corrected code snippets to help developers avoid and fix them.