How to inject Exception Assault using CM4SB (chaos monkey for spring boot) in Spring Data JPA Repository?

[Pratik Chauhan]

0

I want to inject java.sql.SQLException Exception Assault using CM4SB library in target spring boot application for org.springframework.data.repository.CrudRepository.findById method.

Need help with working Assault-watcher configuration.

I tried multiple way but could not get any working solution.

I referred - https://codecentric.github.io/chaos-monkey-spring-boot/latest/#_properties for assault-watcher configuration.

Appreciate your helps !! Thanks !!

[aniiket bhute]

Hi Pratik,

Have you tried below approach ?

Enable Chaos Monkey in application.properties

Configure Chaos Monkey to target repository methods like findById().

chaos.monkey.enabled=true
chaos.monkey.assaults.exceptions-active=true
chaos.monkey.assaults.exception-class=java.sql.SQLException
chaos.monkey.assaults.exception-message=Database connection failed
chaos.monkey.watcher.repository=true

Inject Chaos into CrudRepository.findById()

Ensure you have a Spring Data repository:

@Service

public class UserService {

    @Autowired
    private UserRepository userRepository;

    public User getUserById(Long id) {
        return userRepository.findById(id)
                .orElseThrow(() -> new RuntimeException("User not found"));
    }
}

Run your application and test calling the endpoint. If CM4SB is enabled, some requests will fail with SQLException as configured.

Enable Chaos Monkey Actuator Endpoint

If you need dynamic control, enable Spring Boot Actuator and Chaos Monkey:

management.endpoints.web.exposure.include=chaosmonkey
management.endpoint.chaosmonkey.enabled=true

Then, toggle assaults dynamically via:

curl -X POST http://localhost:8080/actuator/chaosmonkey/assaults/exception

Make sure chaos.monkey.watcher.repository=true is enabled.

cheers

[Pratik Chauhan]

Hi Aniiket,

Thank you for taking interest and providing inputs.

I tried the assault-watcher configuration which you suggested. But, it's not injecting assault at the Repository method.

If you have a working example, please share with me if it's feasible.

Thanks !!

[Pratik Chauhan]

This issue is happening with v3.2.0. Its working fine with v2.2.0

Refer - https://github.com/codecentric/chaos-monkey-spring-boot/issues/554 for complete details.