Custom actuator endpoints in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a custom actuator endpoint class.

Spring Boot

import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;

@[1](id = "custom")
public class CustomEndpoint {

    @ReadOperation
    public String custom() {
        return "Hello from custom endpoint!";
    }
}

Drag options to blanks, or click blank then click option'

AService

BComponent

CEndpoint

DController

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @Endpoint

Forgetting to specify the id in the annotation

The @Endpoint annotation marks the class as a custom actuator endpoint with the given id.

2fill in blank

medium

Complete the code to register the custom endpoint as a Spring bean.

Spring Boot

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class EndpointConfig {

    @Bean
    public CustomEndpoint [1]() {
        return new CustomEndpoint();
    }
}

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AcustomEndpoint

Bendpoint

Ccustom

DcustomActuator

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name as the endpoint id

Using uppercase letters at the start

The bean method name is usually the camelCase version of the class name, here customEndpoint.

3fill in blank

hard

Fix the error in the method that exposes the endpoint data.

Spring Boot

import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;

public class CustomEndpoint {

    @ReadOperation
    public String [1]() {
        return "Custom data";
    }
}

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Afetch

Bcustom

Cread

DgetData

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that conflict with Spring reserved names

Using verbs that are not descriptive

The method name can be any valid name, but to match the example and avoid confusion, use custom.

4fill in blank

hard

Fill both blanks to create a custom actuator endpoint that returns a map with status and message.

Spring Boot

import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import java.util.Map;

@[1](id = "status")
public class StatusEndpoint {

    @[2]
    public Map<String, String> status() {
        return Map.of("status", "UP", "message", "All systems go");
    }
}

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AEndpoint

BReadOperation

CComponent

DService

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up @Component with @Endpoint

Forgetting to annotate the method

The class must be annotated with @Endpoint and the method with @ReadOperation to expose the data.

5fill in blank

hard

Fill all three blanks to create a custom actuator endpoint that accepts a path variable and returns a greeting message.

Spring Boot

import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.boot.actuate.endpoint.annotation.Selector;

@[1](id = "greet")
public class GreetEndpoint {

    @[2]
    public String greet(@[3] String name) {
        return "Hello, " + name + "!";
    }
}

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AEndpoint

BReadOperation

CSelector

DComponent

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to use @Selector for the method parameter

Using @Component instead of @Endpoint

The class uses @Endpoint, the method uses @ReadOperation, and the parameter uses @Selector to accept a path variable.