CUI Logging Skill

CUI Logging Skill

REFERENCE MODE: This skill provides reference material. Load specific standards on-demand based on current task.

CUI-specific logging standards for projects using the CUI logging framework (cui-java-tools). This skill covers CuiLogger usage, LogRecord patterns, and DSL-style LogMessages classes.

Prerequisites

This skill requires CUI library dependencies:

• de.cuioss:cui-java-tools (CuiLogger, LogRecord)

Workflow

Step 1: Load Core Logging Standards

CRITICAL: Load these standards for any logging-related work.

Read: standards/​logging-standards.md

This provides the foundational rules:

• MUST use CuiLogger (SLF4J/​Log4j FORBIDDEN)
• MUST use LogRecord for INFO/​WARN/​ERROR/​FATAL levels
• Exception parameter MUST come first in all logging calls

Step 2: Load Additional Standards (As Needed)

DSL Constants Pattern (load when creating LogMessages classes):

Read: standards/​dsl-constants.md

Use when: Implementing DSL-style LogMessages classes with nested static classes and @UtilityClass pattern.

LogMessages Documentation (load when documenting):

Read: standards/​logmessages-documentation.md

Use when: Writing AsciiDoc documentation for LogMessages classes.

Logging Maintenance (load for migration/​refactoring):

Read: standards/​logging-maintenance-reference.md

Use when: Large-scale logger migration, LogRecord implementation, or maintenance work.

Key Rules Summary

CuiLogger Usage

// CORRECT
private static final CuiLogger LOGGER = new CuiLogger(MyClass.class);

// FORBIDDEN - Never use SLF4J or Log4j directly
private static final Logger LOGGER = LoggerFactory.getLogger(MyClass.class);

LogRecord for Structured Messages

// CORRECT - Use LogRecord for INFO and above
LOGGER.info(INFO.getResolver().formatted("Processing completed"));
LOGGER.warn(WARN.getResolver().formatted("Resource low: %s", resourceName));
LOGGER.error(exception, ERROR.getResolver().formatted("Failed to process"));

// DEBUG/​TRACE - Direct logging allowed (no LogRecord needed)
LOGGER.debug("Debug message: %s", value);

Exception Handling

// CORRECT - Exception FIRST
LOGGER.error(exception, ERROR.getResolver().formatted("Operation failed"));

// WRONG - Exception position
LOGGER.error(ERROR.getResolver().formatted("Operation failed"), exception);

Related Skills

• pm-dev-java:java-core - General Java patterns (no CUI dependencies)
• pm-dev-java-cui:cui-testing - CUI test utilities including JUL testing with LogAsserts

Standards Reference