Fault Tolerance with Spring Boot and Hystrix

This will be a very short story covering only the demo for Circuit breaker in microservice applications. I’ll create another story for fundamentals of fault tolerance and detailed analysis of Netfilx Hystrix vs Apache resilience4j library covering what’s better in which scenario as Hystrix has now officially closed it’s development.

Goal: We’ll be having some fallback methods for API failures and when our microservice will get down then system should automatically detect and handle this without affecting any other service. I’m using my existing spring application as my API supplier. It has few endpoints exposed on 8080 and some business logic connected with mysql. I’ve started mysql on 3306 via docker.

Now, create a controller and a service with a endpoint consuming some exposed API from our existing application. Here, I have used default URL class to consume URL objects.

A sample Controller class.

A Sample Service class.

Also, change the application port to something else than 8080. In my case I’m using 8090.

To test, shutdown the running server on 8080.

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