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Spring Boot Application Properties

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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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