Free RHCEAD Practice Questions

Question 1

A ticket is being transferred between two existing projects. The relevant JPA 2.1 mappings use field access:

Project.tickets:
@OneToMany(mappedBy = "project")
private List<Ticket> tickets;

Ticket.project:
@ManyToOne
@JoinColumn(name = "project_id")
private Project project;

The ticket and both projects are managed in the same active transaction, and both collections are initialized. A helper has already removed the ticket from the old project's collection and added it to the target project's collection. What still needs to happen so the foreign key and the Java object graph agree?

Accepted Answer

Call ticket.setProject(target) to update the owning side of the relationship.

Answer

Call em.merge(target) so the inverse collection becomes the source of the foreign-key update.

Answer

Add cascade = CascadeType.MERGE to Project.tickets so collection membership controls the foreign key.

Answer

Change mappedBy to "project_id" so the collection directly identifies the foreign-key column.

Question 2

An integration test submits valid JSON to a JAX-RS 2.0 resource:

@Path("/quotes")
public class QuoteResource {
    @POST
    @Consumes("application/json")
    @Produces("application/json")
    public Quote create(Quote input) { return input; }
}

The request reaches /quotes with Content-Type: application/json and Accept: application/xml. A JSON reader and writer for Quote are installed. There are no other resource methods, filters, or exception mappers. The create method is never entered. Identify the response and the mismatch responsible.

Accepted Answer

406 Not Acceptable: the client requests a response representation the method does not produce.

Answer

415 Unsupported Media Type: the client requests XML even though it sends a valid JSON entity.

Answer

400 Bad Request: the request Content-Type and Accept headers must specify the same media type.

Answer

500 Internal Server Error: the method must execute before a missing XML writer can be detected.

Question 3

Each order-dispatched event must reach both the billing application and the audit application. Either application may disconnect for maintenance and must receive its missed events after reconnecting. The producer will send each event once to one JMS destination. Both applications establish their subscriptions before publication, keep stable subscription identities, and reconnect before any message expires.

Choose the arrangement that provides both independent delivery and retention during disconnection.

Accepted Answer

One topic with a separate durable subscription for each application.

Answer

One queue with two consumers, using persistent delivery for every event.

Answer

One topic with a shared durable subscription for both applications.

Answer

One topic with separate non-durable subscriptions and persistent messages.

Question 4

A shipping form requires an address and a postal code. Its Bean Validation 1.1 model is:

class ShippingRequest {
    @NotNull
    Address address;
}

class Address {
    @NotNull
    String postalCode;
}

A test sets request.address to a new Address whose postalCode is null. The configured Validator returns an empty violation set from validator.validate(request). No custom validation groups or XML overrides are used. The form must still reject a null address as well as an address with a null postal code. The missing declaration is:

Accepted Answer

Add @Valid to ShippingRequest.address, retaining its existing @NotNull annotation.

Answer

Add @Valid to Address.postalCode, retaining its existing @NotNull annotation.

Answer

Replace @NotNull on ShippingRequest.address with @Valid, leaving Address unchanged.

Answer

Replace @NotNull on Address.postalCode with @Valid, leaving ShippingRequest unchanged.

Question 5

A performance trace covers a JPQL query returning 16 Parcel entities, each associated with a different Depot through @ManyToOne(fetch = FetchType.EAGER). The trace shows one SELECT for the parcels, followed by one SELECT for each depot. Every depot is fully loaded before the service returns. There is no batching, cache hit, or other database work.

A reviewer says this trace proves that the provider ignored EAGER. Which assessment correctly combines the statement count with the JPA fetching contract?

Accepted Answer

Seventeen statements can satisfy EAGER because eager loading does not require one SQL join.

Answer

Sixteen statements satisfy EAGER because the parcel query is included in the first depot load.

Answer

Seventeen statements violate EAGER because the provider must use a single joined SQL statement.

Answer

Thirty-two statements satisfy EAGER because each parcel-depot pair requires two separate selects.

Question 6

A stateless EJB has these security annotations:

@Stateless
@RolesAllowed("catalog-reader")
public class CatalogService {
    public void view() { }

@RolesAllowed("catalog-editor")
    public void revise() { }
}

EJB role enforcement is enabled. JAAS authentication succeeds for a user whose only effective application role is catalog-editor. Calls enter through the container-managed EJB reference; no deployment descriptor overrides the annotations. For this caller, which invocation result is correct?

Accepted Answer

revise is allowed but view is denied; the method annotation replaces the class rule for revise.

Answer

Both are allowed because catalog-editor automatically includes permissions assigned to catalog-reader.

Answer

Both are denied because the class-level role must be satisfied before a method-level role is checked.

Answer

Deployment fails because the class and its method declare different roles in @RolesAllowed.

Question 7

During a CDI code review, an engineer proposes rejecting this injection because ReportFormatter lives longer than RequestDetails:

@ApplicationScoped
public class ReportFormatter {
    @Inject
    private RequestDetails details;

public String label() {
        return details.getRequestId();
    }
}

RequestDetails is a proxyable @RequestScoped bean. Its request ID is initialized for each HTTP request. label() is called only while that request context is active, and ReportFormatter does not cache the returned value. Is the proposed rejection justified?

Accepted Answer

No. The client proxy selects RequestDetails for the current request, not for its owner's lifetime.

Answer

Yes. The application-scoped owner retains the first RequestDetails instance across subsequent requests.

Answer

Yes. CDI requires dependencies to have the same scope as their injection target.

Answer

No. CDI recreates ReportFormatter on every request because it has a request-scoped dependency.

Question 8

Inside an active JTA transaction, a service receives a detached Parcel representing an existing database row. Its status is READY and its note is standard. Both are persistent basic attributes. The service executes:

Parcel managed = em.merge(detached);
detached.setStatus("CANCELLED");
managed.setNote("fragile");

There are no callbacks, concurrent writers, further merges, or other changes. The transaction commits successfully. What values are stored in that row?

Accepted Answer

Status READY; note fragile.

Answer

Status CANCELLED; note fragile.

Answer

Status READY; note standard.

Answer

Status CANCELLED; note standard.

Question 9

An API deletes an existing document with DELETE /documents/73 and returns 204. The connection drops before the client receives that response, so the client sends the identical DELETE again. No one has recreated the document. The documented API policy returns 404 when the target is absent, and the second call does so.

A defect report labels the endpoint non-idempotent because the response codes differ. How should that report be resolved?

Accepted Answer

Close that finding: both requests leave the document absent, so the differing responses do not break idempotency.

Answer

Keep that finding: an idempotent method must return the same status code for every identical request.

Answer

Disable automatic DELETE retries: an absent target after a lost response makes the retry unsafe by definition.

Answer

Replace DELETE with POST: a command endpoint is required when repeated requests can return different responses.

Question 10

A JMS message-driven bean uses container-managed transactions with REQUIRED. It calls an injected stateless InventoryService, also REQUIRED, to reserve stock. Message consumption and database work participate in the same JTA transaction.

When stock data is temporarily unavailable, the service throws a checked InventoryUnavailableException annotated @ApplicationException(rollback = false). The MDB catches it, logs it, and returns normally. Nothing marks the transaction rollback-only. The message is acknowledged even though no reservation was made.

The broker permits redelivery after rollback. What correction keeps a failed reservation from being acknowledged as successful work?

Accepted Answer

Call setRollbackOnly() on the MDB's MessageDrivenContext in the exception handler.

Answer

Use REQUIRES_NEW on InventoryService.reserve to control the MDB's delivery transaction.

Answer

Set acknowledgeMode=Dups-ok-acknowledge on the MDB so logged failures are retried.

Answer

Increase the message time to live so acknowledgment waits for a successful reservation.

Free RHCEAD Practice Questions

Domain 1: Bean validation

Question 1

Domain 2: JPA mapping

Question 2

Question 3

Question 4

Domain 4: Messaging

Question 5

Question 6

Domain 5: REST services with JAX-RS

Question 7

Question 8

Domain 6: Security

Question 9

Domain 7: CDI

Question 10

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