Spring Boot - Logging
You want to log a message only when the log level is DEBUG or lower, but avoid expensive string concatenation if logging is disabled. Which SLF4J pattern should you use?
You want to log a message only when the log level is DEBUG or lower, but avoid expensive string concatenation if logging is disabled. Which SLF4J pattern should you use?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand SLF4J parameterized logging
Using placeholders with logger.debug delays expensiveMethod() evaluation until needed.Step 2: Compare with string concatenation
Concatenation always evaluates expensiveMethod(), wasting resources if debug is off.Final Answer:
Use logger.debug("Message: {}", expensiveMethod()); -> Option DQuick Check:
Use placeholders to avoid unnecessary computation = C [OK]
Quick Trick: Use {} placeholders to delay expensive calls [OK]
Common Mistakes:
- Concatenating strings inside logger calls
- Using wrong log level
- Using System.out.println instead of logger
Master "Logging" in Spring Boot
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