Skip to main content
PROMPT SPACE
J
Freedeveloper-toolsUniversal

java-best-practice-checker

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

skill install https://www.promptspace.in/skills/java-best-practice-checker

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.

Use cases

  • Modernize legacy Java 8 code to use Records, Switch Expressions, and var.
  • Identify thread-safety hazards and manual lock contention in concurrent code.
  • Optimize String handling and Collection choices for high-throughput apps.
  • Ensure proper resource cleanup and prevent JVM memory leaks.

Example

Prompt

Audit this Java class for SE 21 compatibility and memory leaks.

Output

🔴 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();

| # | Location | Category | Issue | Severity |
|---|---|---|---|---|
| 1 | Report.build() | Strings | Loop concat | 🔴 High |

Frequently asked questions

This skill supports Java versions from SE 8 all the way to the latest SE 24 features, including specialized checks for Pattern Matching, Virtual Threads, and Sequenced Collections.