Info endpoint configuration in Spring Boot - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of the Info endpoint with custom properties?

Given a Spring Boot application with the following application.properties configuration:

management.endpoint.info.enabled=true
management.endpoints.web.exposure.include=info
info.app.name=MyApp
info.app.version=1.0.0

What will be the JSON output when accessing /actuator/info?

A {"info":{"app":{"name":"MyApp","version":"1.0.0"}}}

B {"app":{"name":"MyApp","version":"1.0.0"}}

C {"name":"MyApp","version":"1.0.0"}

D {"app.name":"MyApp","app.version":"1.0.0"}

💡 Hint

Think about how Spring Boot nests info properties under the info key in the JSON response.

The info endpoint returns the properties nested under the info key. Custom properties under info.app appear as nested JSON objects. The actual JSON response body contains the app object with its properties.

📝 Syntax

intermediate

Which configuration enables the Info endpoint in Spring Boot?

Which of the following application.properties snippets correctly enables the Info endpoint and exposes it over HTTP?

A

management.endpoint.info.enabled=false
management.endpoints.web.exposure.exclude=info

B management.endpoints.web.exposure.exclude=info

C

management.endpoints.enabled-by-default=false
management.endpoints.web.exposure.include=info

D

management.endpoint.info.enabled=true
management.endpoints.web.exposure.include=info

💡 Hint

Remember you must both enable the endpoint and expose it over HTTP.

Option D explicitly enables the Info endpoint and includes it in the web exposure list, making it accessible via HTTP. Other options either disable it or exclude it.

🔧 Debug

advanced

Why does the Info endpoint return an empty JSON object?

A developer configured the Info endpoint with these properties:

management.endpoint.info.enabled=true
management.endpoints.web.exposure.include=info

But when accessing /actuator/info, the response is {}. What is the most likely cause?

A No custom info properties are defined in <code>application.properties</code> or <code>application.yml</code>

B The Info endpoint is disabled by default and must be enabled in code

C The endpoint URL is incorrect; it should be <code>/info</code> not <code>/actuator/info</code>

D The application is missing the Spring Boot Actuator dependency

💡 Hint

Think about what the Info endpoint shows by default if no info properties are set.

The Info endpoint shows an empty JSON object if no custom info properties are defined. Enabling and exposing the endpoint alone does not add any info data.

🧠 Conceptual

advanced

How to add custom info data programmatically in Spring Boot?

Which approach correctly adds custom information to the Info endpoint response by code?

A Create a bean implementing <code>InfoContributor</code> and override <code>contribute(Info.Builder builder)</code>

B Add a <code>@RestController</code> with a <code>@GetMapping("/actuator/info")</code> method returning a Map

C Override the <code>info()</code> method in the main application class annotated with <code>@SpringBootApplication</code>

D Add properties under <code>management.info.custom</code> in <code>application.properties</code>

💡 Hint

Think about how Spring Boot allows programmatic customization of actuator endpoints.

Implementing the InfoContributor interface and overriding the contribute method allows adding custom info data programmatically. Other options either do not integrate with the actuator or are invalid.

❓ state_output

expert

What is the output of the Info endpoint with multiple InfoContributor beans?

Consider a Spring Boot app with two InfoContributor beans defined:

@Component
public class AppInfoContributor implements InfoContributor {
  public void contribute(Info.Builder builder) {
    builder.withDetail("app", Map.of("name", "AppX"));
  }
}

@Component
public class VersionInfoContributor implements InfoContributor {
  public void contribute(Info.Builder builder) {
    builder.withDetail("version", "2.1.0");
  }
}

What JSON will /actuator/info return?

A {"app":{"name":"AppX"}}

B {"app":{"name":"AppX"},"version":{"version":"2.1.0"}}

C {"app":{"name":"AppX"},"version":"2.1.0"}

D {"version":"2.1.0"}

💡 Hint

Remember that each InfoContributor adds details to the same builder object.

Each InfoContributor adds its details to the shared Info.Builder. The final JSON merges all details at the top level, so both 'app' and 'version' keys appear together.