Intentionally introduce failures in a controlled way (like slow database queries, API failures, server crashes or out-of-memory errors). Find weaknesses before production. Discover how your app handles issues in your testing environment rather than during a real outage. Build confidence in error handling. Verify that your retry logic, timeouts, circuit breakers, and fallback mechanisms actually work as intended. Improve monitoring and alerting. Test whether your observability tools properly detect and alert on degraded performance or failures. Practice incident response. Train your team to respond to issues in a low-stakes environment.
Chaos Monkey for Spring Boot Reference Guide:
<ul>
<li><a href="https://codecentric.github.io/chaos-monkey-spring-boot/latest/" target="_blank" rel="noopener nofollow">https://codecentric.github.io/chaos-monkey-spring-boot/latest/</a></li>
</ul>
Introduction to Chaos Monkey | Baeldung:
<ul>
<li><a href="https://www.baeldung.com/spring-boot-chaos-monkey" target="_blank" rel="noopener nofollow">https://www.baeldung.com/spring-boot-chaos-monkey</a></li>
</ul>

theacademe

Chaos Monkey for Spring Boot enables intentional failure injection in controlled environments to test application resilience. By simulating issues like slow database queries, API failures, server crashes, and memory errors, teams can validate error handling mechanisms (retry logic, timeouts, circuit breakers, fallbacks), improve monitoring and alerting systems, and practice incident response before production outages occur.

Chaos Monkey - Assault the Resiliency of your Spring Boot App