Logging Patterns

This one nails the practice of making logs machine-readable for AI debugging, which matters more now that Claude is analyzing your stack traces. It pushes JSON structured logging with SLF4J and MDC for request tracing, giving you Spring Boot 3.4+ native configs and Logstash encoder setups for older versions. The AI-friendly format section is the real hook: it shows why JSON logs let Claude parse fields directly instead of burning tokens interpreting text patterns. You get working filter code for request IDs, profile switching between JSON and human-readable formats, and jq queries for log analysis. Opinionated about defaulting to JSON, which makes sense if you're doing AI-assisted debugging daily.

skills.sh installs: 300
GitHub stars: 771
last updated: Feb 8, 2026

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Install

$ npx -y skills add decebals/claude-code-java --skill logging-patterns --agent claude-code

Installs into .claude/skills of the current project.

Files

Logging Patterns Skill

Effective logging for Java applications with focus on structured, AI-parsable formats.

When to Use

User says "add logging" / "improve logs" / "debug this"
Analyzing application flow from logs
Setting up structured logging (JSON)
Request tracing with correlation IDs
AI/Claude Code needs to analyze application behavior

AI-Friendly Logging

Key insight: JSON logs are better for AI analysis - faster parsing, fewer tokens, direct field access.

Why JSON for AI/Claude Code?

# Text format - AI must "interpret" the string
2026-01-29 10:15:30 INFO OrderService - Order 12345 created for user-789, total: 99.99

# JSON format - AI extracts fields directly
{"timestamp":"2026-01-29T10:15:30Z","level":"INFO","orderId":12345,"userId":"user-789","total":99.99}

Aspect	Text	JSON
Parsing	Regex/interpretation	Direct field access
Token usage	Higher (repeated patterns)	Lower (structured)
Error extraction	Parse stack trace text	`exception` field
Filtering	grep patterns	`jq` queries

Recommended Setup for AI-Assisted Development

SKILL.md on GitHub

Details

Repository: github.com/decebals/claude-code-java
Categories: DevOps & CI/CD, AI & Agent Building, Debugging, Java & JVM
License: MIT
First seen: Jun 11, 2026

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