Which of the following is the correct way to provide a default value for an environment variable PORT in application.yml?

easy📝 Conceptual Q2 of 15

Spring Boot - Application Configuration

Which of the following is the correct way to provide a default value for an environment variable PORT in application.yml?

Aserver: port: %PORT%:8080

Bserver: port: ${PORT:8080}

Cserver: port: $PORT || 8080

Dserver: port: PORT ? 8080

Step-by-Step Solution

Solution:

Step 1: Recognize Spring Boot default value syntax in YAML
Spring Boot uses ${VAR_NAME:default} to provide defaults for environment variables.
Step 2: Confirm correct YAML indentation and syntax
The correct YAML format is server:\n port: ${PORT:8080} to set port with default 8080.
Final Answer:
server: port: ${PORT:8080} -> Option B
Quick Check:
Default value syntax = ${PORT:8080} [OK]

Quick Trick: Use ${VAR:default} to set default environment variable values [OK]

Common Mistakes:

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