If a property is defined in application.properties and also as a system property (using -D JVM argument), which value does Spring Boot use?

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Spring Boot - Application Configuration

If a property is defined in application.properties and also as a system property (using -D JVM argument), which value does Spring Boot use?

AValue from system property (-D argument)

BValue from environment variable

CValue from application.properties

DValue from default properties

Step-by-Step Solution

Solution:

Step 1: Understand system property precedence
System properties passed with -D have higher priority than application.properties.
Step 2: Confirm Spring Boot precedence order
System properties override property files but are below command line arguments.
Final Answer:
Value from system property (-D argument) -> Option A
Quick Check:
System properties override files [OK]

Quick Trick: System properties (-D) override application.properties [OK]

Common Mistakes:

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