Free EX378 sample questions

Correct answer: %prod.db.url=jdbc:postgresql://prod-db/data

In Quarkus, profile-specific properties are defined using the syntax `%profile.property-key=value`. Therefore, `%prod.db.url` is the correct syntax to target the 'prod' profile. The prefix `prod.` without the percent sign is interpreted as part of the property name, not a profile selector.

Correct answer: @ConfigMapping

The `@ConfigMapping` annotation (from SmallRye Config) is the recommended way to map configuration properties to an interface in Quarkus. It supports nested structures and validation. `@ConfigProperties` is deprecated in favor of `@ConfigMapping`.

Correct answer: 350

In MicroProfile Config, `application.properties` has a default ordinal of 100 (or 250 in some Quarkus contexts depending on location, but typically 250 for application.properties in Quarkus). System properties have an ordinal of 400. To sit between them, a value like 350 is appropriate. (Note: Standard MP Config has app.properties at 100, Env vars at 300, Sys props at 400. Quarkus defaults `application.properties` to 250. So 350 overrides `application.properties` but yields to Sys props).

Correct answer: @ConfigProperty(name = "app.welcome.message", defaultValue = "Hello World") String message;

The `@ConfigProperty` annotation provides a `defaultValue` attribute. If the property `app.welcome.message` is missing from all sources, the container will inject the string "Hello World". Using `Optional ` handles missing values but requires extra code to retrieve the default at runtime.

Correct answer: @Readiness

The `@Readiness` annotation indicates that the application is ready to accept traffic. If a readiness check fails, the orchestration platform (like Kubernetes) stops sending traffic to the pod but does not restart it. `@Liveness` failures trigger a restart.

Correct answer: ReactiveHealthCheck

The `ReactiveHealthCheck` interface (from SmallRye Health) allows implementing health checks that return a `Uni `. This is essential for non-blocking operations in a reactive stack, preventing the blocking of the event loop during health probes.