File-based logging in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the logging file name in application.properties.

Spring Boot

logging.file.name=[1]

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Aoutput.log

Blogfile.txt

Capp.log

Dserver.log

Attempts:

3 left

💡 Hint

Common Mistakes

Using a directory path instead of a file name

Forgetting the file extension

In Spring Boot, logging.file.name sets the log file name. Here, server.log is the correct example.

2fill in blank

medium

Complete the code to set the logging level to DEBUG in application.properties.

Spring Boot

logging.level.root=[1]

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ADEBUG

BINFO

CERROR

DWARN

Attempts:

3 left

💡 Hint

Common Mistakes

Using INFO or ERROR which are less detailed

Using invalid logging levels

The logging.level.root property controls the root logging level. Setting it to DEBUG enables detailed logs.

3fill in blank

hard

Fix the error in the logback-spring.xml snippet to write logs to a file named app.log.

Spring Boot

<appender name="FILE" class="ch.qos.logback.core.FileAppender">
  <file>[1]</file>
  <encoder>
    <pattern>%d{yyyy-MM-dd HH:mm:ss} - %msg%n</pattern>
  </encoder>
</appender>

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A/var/log/app

Bapp.log

Clogs/

Dapp

Attempts:

3 left

💡 Hint

Common Mistakes

Using a directory path without file name

Omitting the file extension

The <file> tag must specify a file name, not a directory. app.log is a valid file name.

4fill in blank

hard

Fill both blanks to configure a rolling file appender with max file size 10MB and max history 5.

Spring Boot

<rollingPolicy class="ch.qos.logback.core.rolling.[1]">
  <maxFileSize>[2]</maxFileSize>
  <maxHistory>5</maxHistory>
</rollingPolicy>

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ASizeBasedRollingPolicy

BTimeBasedRollingPolicy

C10MB

D5MB

Attempts:

3 left

💡 Hint

Common Mistakes

Using time-based rolling policy instead of size-based

Setting maxFileSize to 5MB instead of 10MB

SizeBasedRollingPolicy rolls files based on size. Setting maxFileSize to 10MB limits each log file to 10 megabytes.

5fill in blank

hard

Fill all three blanks to create a log pattern with date, log level, and message.

Spring Boot

<pattern>[1] - [2] - [3]</pattern>

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A%d{yyyy-MM-dd HH:mm:ss}

B%level

C%msg

D%thread

Attempts:

3 left

💡 Hint

Common Mistakes

Using thread name instead of log level

Omitting the message part

The pattern includes date/time (%d{yyyy-MM-dd HH:mm:ss}), log level (%level), and the log message (%msg).