[Solved] Given this application.properties snippet:spring.datasource.url=jdbc:mysql://localhost:3306/db spring.datasource.username=root spring.datasource.password=secret spring.datasource.... | Spring Boot

Spring Boot - Application Configuration

Given this application.properties snippet:

spring.datasource.url=jdbc:mysql://localhost:3306/db
spring.datasource.username=root
spring.datasource.password=secret
spring.datasource.username=admin

What username will Spring Boot use?

Aroot

Badmin

Csecret

Dnull

Step-by-Step Solution

Solution:

Step 1: Identify duplicate property keys
spring.datasource.username is defined twice: once as root, then admin.
Step 2: Understand property override behavior
Last occurrence overrides previous ones, so admin is used.
Final Answer:
admin -> Option B
Quick Check:
Last property value wins on duplicates [OK]

Quick Trick: Last duplicate property value overrides previous [OK]

Common Mistakes:

Using first occurrence value
Confusing password with username
Assuming error on duplicates

Master "Application Configuration" in Spring Boot

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Perf

More Spring Boot Quizzes

Given this application.properties snippet:

Step 1: Identify duplicate property keys

Step 2: Understand property override behavior

Final Answer:

Quick Check:

Want More Practice?