Structured Logging (ARCH4158)
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Key java.logging.structured-logging · Severity warning · Category logging
Building log messages with string concatenation hurts log aggregation and forces the string to be constructed even when the level is disabled. Use parameterized {} templates instead.
Incorrect
Section titled “Incorrect”log.info("User " + userId + " created order " + orderId);Correct
Section titled “Correct”log.info("User {} created order {}", userId, orderId);Write parameterized message templates using SLF4J’s {} placeholders instead of string concatenation.