Spring Boot Application Properties

Spring Boot provides a flexible way to configure applications using application.properties or application.yml files. These configuration files help manage database settings, logging, server properties, and more.

Where to Place `application.properties`?

Inside the src/main/resources/ directory.
Spring Boot automatically loads this file at runtime

Common Configurations in `application.properties`

1. Server Configuration

🔹 server.port → Changes the default port (8080 → 8081).

🔹 server.servlet.context-path → Sets the base URL (localhost:8081/myapp).

server.port=8081

server.servlet.context-path=/myapp

2. Database Configuration (MySQL Example)

🔹 spring.datasource.url → Database connection URL.

🔹 spring.jpa.database-platform → Specifies the Hibernate dialect.

spring.datasource.url=jdbc:mysql://localhost:3306/mydb

spring.datasource.username=root

spring.datasource.password=

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.jpa.database-platform=org.hibernate.dialect.MySQL8Dialect

3. Hibernate & JPA Configuration

🔹 spring.jpa.show-sql → Prints SQL queries in the console.

🔹 spring.jpa.hibernate.ddl-auto → Schema management (update, create, none).

🔹 spring.jpa.properties.hibernate.format_sql → Formats SQL queries.

spring.jpa.show-sql=true

spring.jpa.hibernate.ddl-auto=update

spring.jpa.properties.hibernate.format_sql=true

4. Logging Configuration

🔹 logging.level.root → Set logging level (TRACE, DEBUG, INFO, WARN, ERROR).

🔹 logging.file.name → Save logs to logs/app.log.

logging.level.root=INFO

logging.level.org.springframework=DEBUG

logging.file.name=logs/app.log

Using `application.yml` (YAML Format)

Equivalent YAML Configuration for the Above Properties:

server:

port: 8081

servlet:

context-path: /myapp

spring:

datasource:

url: jdbc:mysql://localhost:3306/mydb

username: root

password:

driver-class-name: com.mysql.cj.jdbc.Driver

jpa:

show-sql: true

hibernate:

ddl-auto: update

properties:

hibernate:

format_sql: true

logging:

level:

root: INFO

org.springframework: DEBUG

file:

name: logs/app.log

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Where to Place application.properties?

Common Configurations in application.properties