Apache POI - Quick Reference When NOT to Use This Skill - CSV files - Use OpenCSV, Apache Commons CSV, or for CSV - PDF generation - Use Apache PDFBox or iText instead - Large Excel files ( 100k rows) - Use or consider CSV export - Excel formulas/macros - POI has limited macro support; consider VBA alternatives - Real-time Excel editing - POI is for generation/parsing, not collaborative editing Deep Knowledge : Use with technology: for comprehensive API documentation, advanced formatting, and formula handling. Pattern Essenziali Maven Create Excel Export Service REST Download Endpoint Cell St…