Generating client code from spec in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to generate a Spring Boot client from an OpenAPI spec using the CLI.

Spring Boot

openapi-generator-cli generate -i api.yaml -g [1] -o ./client

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

Apython

Bjava

Cspring

Dhtml

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'java' instead of 'spring' generates a plain Java client, not Spring Boot.

Using unrelated generators like 'python' or 'html' will not create a Spring Boot client.

The spring generator creates a Spring Boot client from the OpenAPI spec.

2fill in blank

medium

Complete the code to add a library option for the Spring client generation.

Spring Boot

openapi-generator-cli generate -i api.yaml -g spring --library [1] -o ./client

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

Afeign

Bokhttp

Cresttemplate

Dretrofit

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'resttemplate' when the task expects Feign usage.

Using 'okhttp' or 'retrofit' which are not typical Spring Boot client libraries.

The feign library option generates a Spring client using Feign for declarative REST calls.

3fill in blank

hard

Fix the error in the command to generate a Spring client with the correct package name.

Spring Boot

openapi-generator-cli generate -i api.yaml -g spring --package-name [1] -o ./client

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

Acom.example client

Bcom-example-client

Ccom_example_client

Dcom.example.client

Attempts:

3 left

💡 Hint

Common Mistakes

Using dashes or spaces in package names causes errors.

Underscores are not standard in Java package names.

Package names in Java must use dot notation without spaces or dashes, like com.example.client.

4fill in blank

hard

Fill both blanks to configure the generator to use a specific API and model package.

Spring Boot

openapi-generator-cli generate -i api.yaml -g spring --api-package [1] --model-package [2] -o ./client

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

Acom.example.api

Bcom.example.model

Ccom.example.service

Dcom.example.data

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up API and model package names.

Using unrelated package names that don't reflect API or model.

The --api-package sets the package for API interfaces, and --model-package sets the package for data models.

5fill in blank

hard

Fill all three blanks to generate a Spring client with a custom group ID, artifact ID, and version.

Spring Boot

openapi-generator-cli generate -i api.yaml -g spring --group-id [1] --artifact-id [2] --artifact-version [3] -o ./client

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

Acom.example

Bmy-client

C1.0.0

Dorg.sample

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid version formats.

Confusing group ID and artifact ID values.

The --group-id, --artifact-id, and --artifact-version define Maven coordinates for the generated client.