Why logging matters in Spring Boot - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to log an info message in a Spring Boot application.

Spring Boot

logger.[1]("Application started successfully.");

Drag options to blanks, or click blank then click option'

Ainfo

Bdebug

Cwarn

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Using debug instead of info for general messages

Using error for normal startup messages

The info method logs informational messages, which are useful for general application events like startup.

2fill in blank

medium

Complete the code to create a logger instance in a Spring Boot class.

Spring Boot

private static final Logger logger = LoggerFactory.[1](MyApplication.class);

Drag options to blanks, or click blank then click option'

AbuildLogger

BcreateLogger

CnewLogger

DgetLogger

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like createLogger

Confusing with constructor calls

The getLogger method from LoggerFactory creates a logger for the given class.

3fill in blank

hard

Fix the error in the logging statement to correctly log an error message with an exception.

Spring Boot

logger.[1]("Failed to process request", e);

Drag options to blanks, or click blank then click option'

Awarn

Bdebug

Cerror

Dinfo

Attempts:

3 left

💡 Hint

Common Mistakes

Using warn or info instead of error for exceptions

Using debug which is too low level

The error method is used to log error messages along with exceptions.

4fill in blank

hard

Fill both blanks to log a warning message only if the variable 'user' is null.

Spring Boot

if ([1] == null) {
    logger.[2]("User object is null");
}

Drag options to blanks, or click blank then click option'

Auser

Binfo

Cwarn

DuserId

Attempts:

3 left

💡 Hint

Common Mistakes

Checking wrong variable

Using info instead of warn for warnings

Check if user is null, then log a warning with warn method.

5fill in blank

hard

Fill all three blanks to create a log message with the user's name and age using placeholders.

Spring Boot

logger.[1]("User {} is {} years old", [2], [3]);

Drag options to blanks, or click blank then click option'

Ainfo

BuserName

CuserAge

Ddebug

Attempts:

3 left

💡 Hint

Common Mistakes

Using debug instead of info

Swapping the order of variables

Not using placeholders properly

Use info to log the message, and pass userName and userAge as parameters for placeholders.