Resilience4j with Spring Boot

Every network call you make will fail eventually. The question is whether it fails in a way that degrades one feature, or in a way that exhausts your thread pool and takes the whole service with it.

Resilience4j is the library Spring Boot applications reach for to make that difference. This course covers each of its core patterns in turn, what problem it actually solves, and the configuration mistakes that quietly make it useless.

What you build

A Spring Boot service hardened against the failure modes of its dependencies.

What you learn

• Add retries without amplifying an outage
• Use circuit breakers, and configure the thresholds deliberately
• Apply rate limiters and bulkheads to protect shared resources
• Set timeouts that actually fire
• Provide fallbacks that degrade gracefully instead of returning 500s

Before you start

• Comfortable building Spring Boot services
• Some experience calling a downstream API