Paranoia: An automatic chaos engineering tool for Spring

- **Chaos Engineering** is the practice of intentionally injecting failures (e.g., network delays, CPU spikes, service crashes) into a system to test its resilience. It was popularized by Netflix's "Chaos Monkey." - **Paranoia** is an open-source tool (Java, Spring Boot) that automates this: it hooks into a running application and, based on configurable rules, randomly introduces faults like HTTP errors, method exceptions, or latency during normal runtime. - **Spring Boot** is the dominant Java framework for building microservices. Paranoia targets Spring specifically, making it easy to add to existing projects without code changes (it uses Spring's AOP — aspect-oriented programming — to intercept calls). - The main alternative is **Chaos Monkey for Spring Boot** (by Netflix), but Paranoia claims to be more flexible (e.g., per-endpoint rules, conditional faults based on request data).