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180-java-observability-logging

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UpdatedMarch 19, 2026 at 20:26

Use when you need to implement or improve Java logging and observability — including selecting SLF4J with Logback/Log4j2, applying proper log levels (ERROR, WARN, INFO, DEBUG, TRACE), parameterized logging, secure logging without sensitive data exposure, environment-specific configuration, log aggregation and monitoring, or validating logging through tests. Part of the skills-for-java project

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jabrena

jabrena/cursor-rules-examples

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name	180-java-observability-logging
description	Use when you need to implement or improve Java logging and observability — including selecting SLF4J with Logback/Log4j2, applying proper log levels (ERROR, WARN, INFO, DEBUG, TRACE), parameterized logging, secure logging without sensitive data exposure, environment-specific configuration, log aggregation and monitoring, or validating logging through tests. Part of the skills-for-java project
license	Apache-2.0
metadata	{"author":"Juan Antonio Breña Moral","version":"0.13.0-SNAPSHOT"}

Java Logging Best Practices

Implement effective Java logging following standardized frameworks, meaningful log levels, core practices (parameterized logging, exception handling, no sensitive data), flexible configuration, security-conscious logging, monitoring and alerting, and comprehensive logging validation through testing.

What is covered in this Skill?

Standardized framework selection: SLF4J facade with Logback or Log4j2
Meaningful and consistent log levels: ERROR, WARN, INFO, DEBUG, TRACE
Core practices: parameterized logging, proper exception handling, avoiding sensitive data
Configuration: environment-specific (logback.xml, log4j2.xml), output formats, log rotation
Security: mask sensitive data, control log access, secure transmission, GDPR/HIPAA compliance
Log monitoring and alerting: centralized aggregation (ELK, Splunk, Loki), automated alerts
Logging validation through testing: assert log messages, verify formats, test levels, measure performance impact

Scope: The reference is organized by examples (good/bad code patterns) for each core area. Apply recommendations based on applicable examples.

Constraints

Before applying any logging recommendations, ensure the project compiles. Compilation failure is a blocking condition. After applying improvements, run full verification.

MANDATORY: Run ./mvnw compile or mvn compile before applying any change
SAFETY: If compilation fails, stop immediately — do not proceed until resolved
VERIFY: Run ./mvnw clean verify or mvn clean verify after applying improvements
BEFORE APPLYING: Read the reference for detailed good/bad examples, constraints, and safeguards for each logging pattern

When to use this skill

Review Java code for logging and observability
Apply best practices for logging and observability in Java code

Reference

For detailed guidance, examples, and constraints, see references/180-java-observability-logging.md.

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name	180-java-observability-logging
description	Use when you need to implement or improve Java logging and observability — including selecting SLF4J with Logback/Log4j2, applying proper log levels (ERROR, WARN, INFO, DEBUG, TRACE), parameterized logging, secure logging without sensitive data exposure, environment-specific configuration, log aggregation and monitoring, or validating logging through tests. Part of the skills-for-java project
license	Apache-2.0
metadata	{"author":"Juan Antonio Breña Moral","version":"0.13.0-SNAPSHOT"}

Java Logging Best Practices

What is covered in this Skill?

Standardized framework selection: SLF4J facade with Logback or Log4j2
Meaningful and consistent log levels: ERROR, WARN, INFO, DEBUG, TRACE
Core practices: parameterized logging, proper exception handling, avoiding sensitive data
Configuration: environment-specific (logback.xml, log4j2.xml), output formats, log rotation
Security: mask sensitive data, control log access, secure transmission, GDPR/HIPAA compliance
Log monitoring and alerting: centralized aggregation (ELK, Splunk, Loki), automated alerts
Logging validation through testing: assert log messages, verify formats, test levels, measure performance impact

Scope: The reference is organized by examples (good/bad code patterns) for each core area. Apply recommendations based on applicable examples.

Constraints

Before applying any logging recommendations, ensure the project compiles. Compilation failure is a blocking condition. After applying improvements, run full verification.

MANDATORY: Run ./mvnw compile or mvn compile before applying any change
SAFETY: If compilation fails, stop immediately — do not proceed until resolved
VERIFY: Run ./mvnw clean verify or mvn clean verify after applying improvements
BEFORE APPLYING: Read the reference for detailed good/bad examples, constraints, and safeguards for each logging pattern

When to use this skill

Review Java code for logging and observability
Apply best practices for logging and observability in Java code

Reference

For detailed guidance, examples, and constraints, see references/180-java-observability-logging.md.