Migration Overview Migrating from Java 8 to Java 11 is the most common Java upgrade scenario. The migration has two distinct phases: Make it compile and run — fix incompatibilities introduced by Java 9–11 Modernise the code — adopt var, List.of(), String.isBlank(), and other new APIs Phase 1 is mandatory and blocks the upgrade. Phase 2 is optional and can happen incrementally. This guide focuses entirely on Phase 1. The 10-Step Migration Checklist [ ] 1.

Using This Reference This is the final article in the Spring Security series. It is a consolidated reference — not a tutorial. Come back to this checklist before every launch and when reviewing a new codebase. Each item links back to the relevant article in the series. 1. Keep Spring Security Updated Security vulnerabilities in Spring Security itself are rare but severe when they occur. A dependency that is one minor version behind can expose known CVEs.