[Solved] You wrote this in application.properties:service.url=${SERVICE_URL}But at runtime, Spring Boot throws an error about unresolved placeholder. What is the likely cause? | Spring Boot

Spring Boot - Application Configuration

You wrote this in application.properties:

service.url=${SERVICE_URL}

But at runtime, Spring Boot throws an error about unresolved placeholder. What is the likely cause?

AYou must use %SERVICE_URL% instead

BThe syntax ${SERVICE_URL} is invalid

CThe environment variable SERVICE_URL is not set

DSpring Boot does not support environment variables

Step-by-Step Solution

Solution:

Step 1: Understand placeholder resolution in Spring Boot
Spring Boot tries to replace ${SERVICE_URL} with the environment variable value.
Step 2: Identify cause of unresolved placeholder error
If SERVICE_URL is not set in environment or properties, Spring Boot cannot resolve it and throws an error.
Final Answer:
The environment variable SERVICE_URL is not set -> Option C
Quick Check:
Unresolved placeholder = missing env var [OK]

Quick Trick: Unresolved placeholder means env var is missing [OK]

Common Mistakes:

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