Spring Boot Application Properties Complete Guide To

When you build modern microservices with Spring Boot, your application often interacts with multiple infrastructure components — databases, caches, message brokers, authentication services, and more. Instead of hardcoding configurations, Spring Boot uses an elegant externalized configuration mechanism via application.properties (or application.yml ). In this blog, we’ll see practical examples of configuring: - MySQL - MongoDB - Redis - Apache Kafka - JWT authentication - OAuth2 1. MySQL Configuration Spring Boot auto-configures DataSource and JPA if it detects spring-boot-starter-data-jpa in your classpath.

# =============================== # MySQL Database Configuration # =============================== spring.datasource.url=jdbc:mysql://localhost:3306/mydb?useSSL=false&serverTimezone=UTC spring.datasource.username=root spring.datasource.password=secret spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver # JPA / Hibernate spring.jpa.hibernate.ddl-auto=update spring.jpa.show-sql=true spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect Notes: - ddl-auto=update is good for dev, but usevalidate ornone in production. - show-sql=true helps in debugging SQL queries. 2. MongoDB Configuration If you add spring-boot-starter-data-mongodb , Spring Boot will create a MongoTemplate automatically. # =============================== # MongoDB Configuration # =============================== spring.data.mongodb.uri=mongodb://localhost:27017/mydatabase spring.data.mongodb.database=mydatabase 3. Redis Configuration Spring Boot + spring-boot-starter-data-redis lets you easily set up Redis caching or key-value store usage.

# =============================== # Redis Configuration # =============================== spring.data.redis.host=localhost spring.data.redis.port=6379 spring.data.redis.password= spring.data.redis.timeout=60000 4. Apache Kafka Configuration For message-driven microservices using Kafka (spring-kafka dependency): # =============================== # Kafka Configuration # =============================== spring.kafka.bootstrap-servers=localhost:9092 spring.kafka.consumer.group-id=my-group spring.kafka.consumer.auto-offset-reset=earliest spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer 5. JWT Configuration JWT isn’t auto-configured by Spring Boot — you define properties for your custom security configuration. # =============================== # JWT Configuration # =============================== jwt.secret=my-super-secret-key jwt.expiration=3600000 # 1 hour in milliseconds jwt.refresh-expiration=604800000 # 7 days 6.

OAuth2 Configuration For OAuth2 login with Google, GitHub, or other providers (spring-boot-starter-oauth2-client ): # =============================== # OAuth2 Configuration (Google Example) # =============================== spring.security.oauth2.client.registration.google.client-id=your-client-id spring.security.oauth2.client.registration.google.client-secret=your-client-secret spring.security.oauth2.client.registration.google.scope=email,profile spring.security.oauth2.client.registration.google.redirect-uri={baseUrl}/login/oauth2/code/{registrationId} spring.security.oauth2.client.provider.google.authorization-uri=https://accounts.google.com/o/oauth2/auth spring.security.oauth2.client.provider.google.token-uri=https://oauth2.googleapis.com/token spring.security.oauth2.client.provider.google.user-info-uri=https://www.googleapis.com/oauth2/v3/userinfo 7. Logging for Debugging While integrating multiple services, detailed logging can be invaluable. # =============================== # Logging Configuration # =============================== logging.level.root=INFO logging.level.org.springframework=DEBUG logging.level.org.hibernate.SQL=DEBUG logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE 8. Profile-Specific Configuration You can create environment-specific property files: application-dev.properties application-prod.properties Yaml Based configuration Got it — I’ll extend the blog so it now includes a .yml version of all those configurations.

We’ll keep the structure parallel so readers can easily map .properties to .yml syntax. Top comments (1) Some comments may only be visible to logged-in visitors. Sign in to view all comments.

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