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Spring Bootframework~20 mins

Why logging matters in Spring Boot - Challenge Your Understanding

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Challenge - 5 Problems
🎖️
Logging Mastery in Spring Boot
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Test your skills under time pressure!
🧠 Conceptual
intermediate
1:30remaining
Why is logging important in Spring Boot applications?

Choose the main reason why logging is crucial in Spring Boot applications.

AIt automatically fixes bugs in the code without developer intervention.
BIt replaces the need for unit testing by showing errors in logs.
CIt helps track application behavior and diagnose issues during runtime.
DIt increases the application speed by caching responses.
Attempts:
2 left
💡 Hint

Think about how developers find problems in running applications.

💻 Command Output
intermediate
1:30remaining
What is the output of this Spring Boot logging code?

Given the following Spring Boot code snippet, what will be printed in the console?

Spring Boot
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Demo {
    private static final Logger logger = LoggerFactory.getLogger(Demo.class);

    public static void main(String[] args) {
        logger.info("Application started");
        logger.debug("Debugging info");
    }
}
A[INFO] Application started
B
[INFO] Application started
[DEBUG] Debugging info
C[DEBUG] Debugging info
DNo output because logging is disabled by default
Attempts:
2 left
💡 Hint

By default, Spring Boot logs INFO level and above.

❓ Configuration
advanced
2:00remaining
How to enable DEBUG level logging in Spring Boot?

Which configuration snippet correctly enables DEBUG level logging for the entire Spring Boot application?

Aspring.logging.level=DEBUG
Blogging.level.root=INFO
Clogging.debug.enabled=true
Dlogging.level.root=DEBUG
Attempts:
2 left
💡 Hint

Look for the property that controls root logging level.

❓ Troubleshoot
advanced
2:00remaining
Why are some log messages missing in Spring Boot?

A developer notices that DEBUG log messages are not appearing in the console. What is the most likely cause?

AThe logging level is set higher than DEBUG, such as INFO or WARN.
BThe application has no logger defined in the code.
CThe log file is full and cannot write new messages.
DThe JVM does not support logging at DEBUG level.
Attempts:
2 left
💡 Hint

Check the logging level configuration.

✅ Best Practice
expert
2:30remaining
What is the best practice for logging sensitive information in Spring Boot?

Which option describes the best practice for handling sensitive data in logs?

ALog all data including sensitive info to have full traceability in case of issues.
BAvoid logging sensitive data like passwords or personal info to protect user privacy.
CEncrypt the entire log file so sensitive data can be logged safely.
DDisable logging completely to prevent any data exposure.
Attempts:
2 left
💡 Hint

Think about user privacy and security risks.