In Spring Boot, how can you inject an environment variable named API_KEY into your application.properties file?

easy📝 Conceptual Q1 of 15

Spring Boot - Application Configuration

In Spring Boot, how can you inject an environment variable named API_KEY into your application.properties file?

Aapi.key=${API_KEY}

Bapi.key=API_KEY

Capi.key=$API_KEY

Dapi.key=%API_KEY%

Step-by-Step Solution

Solution:

Step 1: Understand Spring Boot property placeholder syntax
Spring Boot uses ${VAR_NAME} to reference environment variables in configuration files.
Step 2: Apply correct syntax for environment variable injection
To inject API_KEY, use api.key=${API_KEY} in application.properties.
Final Answer:
api.key=${API_KEY} -> Option A
Quick Check:
Environment variable syntax = api.key=${API_KEY} [OK]

Quick Trick: Use ${VAR_NAME} to inject environment variables in Spring Boot [OK]

Common Mistakes:

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