Java 25 and Spring Boot 4 Reviewer

Purpose

Use this skill to run a structured review of Java 25 and Spring Boot 4 code. Keep findings grounded in the actual codebase and use the reference files only for the focus areas that apply.

Critical rules

• Never review without code context. Ask for files, diffs, or the relevant module if none is provided.
• Always cite file paths and line numbers for findings.
• Treat Java 25 and Spring Boot 4 as the target baseline unless the build files show otherwise.
• Analyze workload before recommending virtual threads, reactive rewrites, or architecture changes.
• Use JSpecify as the preferred null-safety baseline for new Boot 4 code, but confirm whether the codebase is still in transition before flagging every legacy annotation.
• Prefer official Spring and Java guidance when a claim depends on framework behavior.

Workflow

Step 1: Confirm scope