Java Best Practice Checker

    10

    Expert Java code auditor for SE 8–24, flagging performance leaks, threading risks, and modernization gaps.

    Free

    77 installs5.0 (1 review)

    Works with the AI tools you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIGitHub CopilotGitHub CopilotGemini CLIGemini CLI+20 more

    java-best-practice-checker

    Example session with this skill installed

    Can you review this Java code for me? It's a method that builds a report by looping through a list and adding strings together using the plus operator.

    • Read your context and instructions
    • Compiled the java-best-practice-checker

    🔴 Issue 1 — Concatenation in loop (Report.build)
    Each += allocates a new String; O(n²) performance.
    // ✅ Fix

    StringBuilder sb = new StringBuilder();
for (var item : list) { sb.append(item); }
return sb.toString();
    #LocationCategoryIssueSeverity
    1Report.build()StringsLoop concat🔴 High

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    About this skill

    What it does

    This skill performs an exhaustive, automated audit of Java source code ranging from SE 8 through the latest SE 24 features. It acts as a specialized static analysis engine that identifies violations of modern best practices, concurrency hazards, and architectural anti-patterns.

    Why use this skill

    Unlike standard linters, this skill provides deep context and "why it matters" explanations for every flag. It helps developers modernize legacy codebases by suggesting Java 21+ features like Record Patterns and Virtual Threads, while simultaneously catching classic "silent killers" like String Pool bypasses and thread-safety bugs in Singletons.

    Supported areas

    • Modern Syntax: Pattern matching (SE 21), Unnamed variables (SE 22), Stream Gatherers (SE 24).
    • Core Performance: String handling, wrapper class caching, and JIT-friendly coding patterns.
    • Collections: Deep analysis of the Collections Framework and the new SequencedCollection API.
    • Architecture: Dependency injection, OOP encapsulation, and Design Pattern implementations.
    • JVM Internals: Garbage collection awareness, memory leak detection, and resource management.

    The Output

    The skill generates a structured report featuring severity-coded issues (🔴/🟡/🟢), root-cause analysis, and side-by-side "Fix" code blocks. Every review concludes with a professional Summary Table for quick triage by lead developers or PR reviewers.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
    1. 1

      Download the ZIP

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    2. 2

      Unzip into your skills folder

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    3. 3

      Ask your agent to use it

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    77 people have installed this skill.

    Trust & safety

    Security scanned

    Verified clean 5 months ago

    • Free to download with an account

    Listed5 months ago

    What's inside

    Frequently Asked Questions