EX378

EX378
Red Hat Certified Cloud-
native Developer exam

,1. Create a configuration property for the application name and inject it into a CDI
bean.
A. See the Explanation.
Answer: A
Explanation:

2. Add to application.properties: app.name=CloudNativeApp

3. Create a bean:
@ApplicationScoped
public class AppNameService {
@Inject
@ConfigProperty(name = "app.name")




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String appName;




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public String getAppName() {




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return appName;




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}




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}


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4. Inject AppNameService into a REST endpoint or another bean to use it.
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5. Externalize a boolean flag and use it to enable/disable a service method.
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A. See the Explanation.
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Answer: A
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Explanation:
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6. In application.properties:
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feature.enabled=true
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7. Inject the flag:
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@ApplicationScoped
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public class FeatureService {
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@Inject
@ConfigProperty(name = "feature.enabled")
boolean enabled;
public String execute() {
return enabled ? "Feature is ON" : "Feature is OFF";
}
}


8. Use default values when a configuration property is missing.

,A. See the Explanation.
Answer: A
Explanation:
@ApplicationScoped
public class TimeoutService {
@Inject
@ConfigProperty(name = "request.timeout", defaultValue = "5000")
int timeout;
public int getTimeout() {
return timeout;
}
}
This allows your app to run even if request.timeout is not in the config file.




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9. Inject a configuration property into a constructor using MicroProfile Config.




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A. See the Explanation.




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Answer: A


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Explanation: ti
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@ApplicationScoped
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public class DatabaseService {
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private final String jdbcUrl;
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@Inject
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public DatabaseService(@ConfigProperty(name = "db.url") String jdbcUrl) {
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this.jdbcUrl = jdbcUrl;
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}
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public String getJdbcUrl() {
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return jdbcUrl;
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}
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}
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Ensure db.url is defined in application.properties.
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10. Inject a property into a JAX-RS resource class.
A. See the Explanation.
Answer: A
Explanation:
@Path("/env")
public class EnvResource {
@Inject
@ConfigProperty(name = "env.type")
String envType;
@GET

, public String getEnv() {
return "Environment: " + envType;
}
}
Declare env.type=dev in application.properties.


11. Use a configuration property to control bean behavior via conditional logic.
A. See the Explanation.
Answer: A
Explanation:

12. In application.properties: logging.verbose=false




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13. In the service:




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@ApplicationScoped




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public class LoggerService {




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@Inject


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@ConfigProperty(name = "logging.verbose") ti
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boolean verbose;
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public void log(String message) {
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if (verbose) System.out.println("[VERBOSE] " + message);
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}
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}
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14. Inject a list of values from a comma-separated property.
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A. See the Explanation.
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Answer: A
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Explanation:
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supported.locales=en,fr,de
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@ApplicationScoped
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public class LocaleService {
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@Inject
@ConfigProperty(name = "supported.locales")
List<String> locales;
public List<String> getLocales() {
return locales;
}
}
MicroProfile config automatically converts the string to List<String>.