Environment-based profiles in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of environment-based profiles in Spring Boot?

Environment-based profiles allow you to define different configurations for different environments, like development, testing, and production. This helps your app behave correctly depending on where it runs.

beginner

How do you activate a specific profile in Spring Boot?

You can activate a profile by setting the spring.profiles.active property. For example, in application.properties or as a command line argument: --spring.profiles.active=dev.

beginner

What file naming convention does Spring Boot use for profile-specific properties?

Spring Boot uses application-{profile}.properties or application-{profile}.yml. For example, application-dev.properties for the 'dev' profile.

intermediate

Can you have multiple active profiles at the same time in Spring Boot?

Yes, you can activate multiple profiles by separating them with commas, like spring.profiles.active=dev,debug. Spring will load configurations from all active profiles.

intermediate

How does Spring Boot decide which profile-specific properties to use when multiple profiles are active?

Spring Boot loads properties in order. The last profile in the list has higher priority and can override earlier profiles. This lets you combine and override settings as needed.

Which property activates a Spring Boot profile?

A spring.profile.enable

B spring.profiles.active

C spring.environment.profile

D spring.boot.profile

The correct property to activate profiles is spring.profiles.active.

What is the correct filename for properties used only in the 'test' profile?

A application-test.properties

B application.properties.test

C test-application.properties

D application.properties

Profile-specific files follow the pattern application-{profile}.properties, so application-test.properties is correct.

If you activate profiles 'dev' and 'prod' together, which profile's properties take precedence?

A prod

B dev

C Both have equal priority

D Depends on alphabetical order

The last profile listed in spring.profiles.active has higher priority and overrides earlier ones.

How can you activate a profile when running a Spring Boot app from the command line?

A --spring.profile=profileName

B --activate.profile=profileName

C --profile.active=profileName

D --spring.profiles.active=profileName

You activate a profile on the command line with --spring.profiles.active=profileName.

Why use environment-based profiles in Spring Boot?

A To store all settings in one file

B To avoid using properties files

C To run different code depending on environment

D To disable configuration

Profiles let you run different configurations or code depending on the environment, like dev or production.

Explain how Spring Boot uses environment-based profiles to manage different configurations.

Think about how you might want your app to behave differently in development vs production.

Describe how to activate multiple profiles and how Spring Boot resolves conflicts between them.

Consider the priority when two profiles set the same property.