juniorSpring
What is application.properties used for?
Updated May 17, 2026
Short answer
It is used to configure Spring Boot application settings.
Deep explanation
It defines properties like server port, database configuration, logging levels, and custom application settings.
Real-world example
Changing environment configs without code changes.
Common mistakes
- Hardcoding configuration in Java classes.
Follow-up questions
- What is application.yml?
- How to override properties per environment?