How can you configure logging in Spring boot application?

ghz 9months ago ⋅ 131 views

In a Spring Boot application, you can configure logging using various methods. Here's a basic guide on how to configure logging:

  1. Use Application Properties or YAML:

    You can configure logging settings in the application.properties or application.yml file. Here are some common properties:

    # Set logging level for root logger
logging.level.root=INFO

# Set logging level for specific packages or classes
logging.level.org.springframework=DEBUG
logging.level.com.example=TRACE

# Specify logging pattern
logging.pattern.console=%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n

    logging:
  level:
    root: INFO
    org.springframework: DEBUG
    com.example: TRACE
  pattern:
    console: '%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n'

    You can customize the logging level, format, and appenders (console, file, etc.) using these properties.

  2. Use Logback or Log4j2 Configuration File:

    You can create a logback.xml (for Logback) or log4j2.xml (for Log4j 2) configuration file in the src/main/resources directory to configure logging settings programmatically.

    Here's an example logback.xml configuration:

    <configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <root level="INFO">
        <appender-ref ref="STDOUT" />
    </root>
</configuration>

    Here's an example log4j2.xml configuration:

    <Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
        </Console>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="Console"/>
        </Root>
    </Loggers>
</Configuration>

    You can customize the logging appenders, log levels, patterns, and other settings in these configuration files.

  3. Use Spring Boot External Logging Configuration:

    You can also use external logging configuration files such as logback-spring.xml or log4j2-spring.xml. These files allow you to use Spring Boot's properties for configuring logging settings, providing more flexibility and integration with Spring Boot features such as profile-specific logging.

    <configuration>
    <springProperty scope="context" name="logging.level.root" source="logging.level.root"/>
    <springProperty scope="context" name="logging.pattern.console" source="logging.pattern.console"/>

    <include resource="org/springframework/boot/logging/logback/base.xml"/>

    <logger name="org.springframework.web" level="${logging.level.root}"/>
    <logger name="com.example" level="DEBUG"/>

    <root level="${logging.level.root}">
        <appender-ref ref="CONSOLE"/>
    </root>
</configuration>

    In this example, ${logging.level.root} and ${logging.pattern.console} are Spring Boot properties that can be customized in application.properties or application.yml.

Choose the method that best suits your requirements and preferences for configuring logging in your Spring Boot application.

#spring