Spring Boot 4 Reviewer (Java 17+)

Purpose

Use this skill to run a structured review of Spring Boot 4 code on any supported Java version (17 minimum; 21 LTS and 25 are common in greenfield Boot 4 projects). 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 Spring Boot 4 as the target. Read the project's pom.xml / build.gradle to determine the actual Java version (Boot 4 supports 17, 21, and 25). Do not flag Java 17 or 21 as "too old" — they are valid Boot 4 baselines.
• 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