EX378 sample questions

Question 1

A developer needs to map a complex configuration structure for an external payment provider into a Java object. The configuration includes a provider name, an API key, and a nested object for timeout settings. Which annotation should be applied to the interface to enable type-safe configuration mapping in Quarkus?

Accepted Answer

@ConfigMapping

Answer

@ConfigurationProperties

Answer

@ConfigProperties

Answer

@ConfigRoot

Question 2

You are implementing a custom `ConfigSource` to read configuration from a legacy database. You want this source to override values found in `application.properties` but be overridden by system properties. What is the appropriate ordinal value to return from `getOrdinal()`?

Accepted Answer

350

Answer

410

Answer

90

Answer

260

Question 3

A developer is injecting an optional configuration property named `app.welcome.message` into a CDI bean. If the property is not defined in any configuration source, the application should default to "Hello World". Which code snippet correctly achieves this?

Accepted Answer

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

Answer

@ConfigProperty(name = "app.welcome.message") String message = "Hello World";

Answer

@Inject @Config("app.welcome.message") String message;

Answer

@ConfigProperty(name = "app.welcome.message") Optional message;

Question 4

You are creating a custom health check to verify the connectivity of a critical downstream payment gateway. The check should only influence the orchestration platform's decision to route traffic to the pod, not whether to restart it. Which annotation should you use on your HealthCheck implementation?

Accepted Answer

@Readiness

Answer

@Liveness

Answer

@Startup

Answer

@Health

Question 5

A developer needs to implement a non-blocking health check in a reactive Quarkus application. The check involves an asynchronous call to a remote service using a Mutiny `Uni`. Which interface should the bean implement to support this reactive pattern?

Accepted Answer

ReactiveHealthCheck

Answer

HealthCheck

Answer

AsyncHealthCheck

Answer

UniHealthCheck

Question 6

You have configured a custom ConfigSource in your Quarkus application to load properties from a centralized Vault service. However, you notice that these properties are being ignored when a system property with the same key exists. Why is this happening?

Accepted Answer

The Vault ConfigSource has a lower ordinal than the System Properties ConfigSource.

Answer

The custom ConfigSource must be registered in META-INF/beans.xml.

Answer

Quarkus does not support overriding system properties at runtime.

Answer

Vault properties are loaded lazily and are not available during the initial config build.

Free EX378 sample questions

You are implementing a custom `ConfigSource` to read configuration from a legacy database. You want this source to override values found in `application.properties` but be overridden by system properties. What is the appropriate ordinal value to return from `getOrdinal()`?

A developer is injecting an optional configuration property named `app.welcome.message` into a CDI bean. If the property is not defined in any configuration source, the application should default to "Hello World". Which code snippet correctly achieves this?

A developer needs to implement a non-blocking health check in a reactive Quarkus application. The check involves an asynchronous call to a remote service using a Mutiny `Uni`. Which interface should the bean implement to support this reactive pattern?

You have configured a custom ConfigSource in your Quarkus application to load properties from a centralized Vault service. However, you notice that these properties are being ignored when a system property with the same key exists. Why is this happening?

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