🔴 1. Data Access & Connection Management These are critical because they affect performance, scalability, and outages.
🔹 Redis ❌ Jedis (older pattern, topology issues)
✅ Lettuce (reactive, auto-reconnect)
✅ Valkey Glide (AWS recommended)
🔹 JDBC Connection Pool ❌ Apache DBCP
❌ C3P0
✅ HikariCP (default in Spring Boot, fastest, stable)
🔹 ORM / Persistence ❌ Old Hibernate 4.x
❌ MyBatis legacy configs
✅ Hibernate 6+
✅ Spring Data JPA latest