Logging (Spring Boot)

Logback JSON structured logging

Each log line will be a JSON object with fields like @timestamp, @version, message, logger_name, thread_name, level, and stack traces as structured arrays. If you need to customize which fields appear or add MDC context, the LogstashEncoder supports extensive configuration via nested elements in the appender.

pom.xml

    <!-- Structured JSON logging (Logback JSON encoder) -->

    <dependency>

      <groupId>net.logstash.logback</groupId>

      <artifactId>logstash-logback-encoder</artifactId>

      <version>9.0</version>

    </dependency>

src/main/resources/logback-spring.xml

Only output to console desired, no logging to file

<?xml version="1.0" encoding="UTF-8"?>

<!-- WARNING Since Spring Boot 2.1.11.RELEASE, logback-spring.xml must exist at both:

             -src/main/resources/

-src/test/resources/

-->

<configuration>

  <appender name="CONSOLE_JSON" class="ch.qos.logback.core.ConsoleAppender">

    <encoder class="net.logstash.logback.encoder.LogstashEncoder"/>

  </appender>

    <!-- Enable DEBUG (or TRACE) only for tests

    <logger name="edu.cou" level="DEBUG"/> -->

  <root level="INFO">

    <appender-ref ref="CONSOLE_JSON"/>

  </root>

</configuration>