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Latest EX378 Exam Practice Questions

The practice questions for EX378 exam was last updated on 2026-02-24 .

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Question#1

Configure a timeout duration via MicroProfile Config instead of annotation.

A. See the Explanation.

Explanation:

Question#2

What is a channel in the context of Quarkus reactive messaging, and how is it used?

A. See the Explanation.

Explanation:
A channel is a named stream of messages used to link producers and consumers. Channels are declared implicitly via @Incoming and @Outgoing, and configured in application.properties.

Question#3

How do you propagate trace context between microservices using HTTP?

A. See the Explanation.

Explanation:
Use the quarkus-rest-client-reactive with context propagation:
@RegisterRestClient
@Path("/next")
public interface DownstreamService {
@GET
@Traced // optional, to enforce tracing on outgoing call String callNext();
}
Context is auto-propagated using W3C Trace Context headers.

Question#4

How do you verify parent-child relationships of spans across services?

A. See the Explanation.

Explanation:
Open Jaeger UI ® Search for trace by service ® Click on a trace
• You’ll see a hierarchical view
• Parent spans include metadata like HTTP method and service name Child spans appear nested under parent spans.

Question#5

Set authentication failure response for unauthorized users.

A. See the Explanation.

Explanation:
Use Quarkus’s default or define a custom ExceptionMapper<UnauthorizedException> to return a JSON response with error details.

Disclaimer

This page is for educational and exam preparation reference only. It is not affiliated with RedHat, Red Hat Certified Cloud-native Developer, or the official exam provider. Candidates should refer to official documentation and training for authoritative information.

Exam Code: EX378Q & A: 450 Q&AsUpdated: 2026-02-24

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