Deploying a Multi-Module Spring Boot App to Render with PostgreSQL, Redis, Docker, and Flyway

Short summary

Deploying a multi-module Spring Boot app to Render requires proper environment profiles, service configuration, and database driver setup that differ from local development. The author covers Docker multi-stage optimization, correct Redis declaration as a service (not database), Spring profile activation, and PostgreSQL JDBC URL formatting to switch from MySQL. Key pitfalls: missing SPRING_PROFILES_ACTIVE, incorrect Redis placement in render.yaml, and PostgreSQL URL transformation.

• •Activate environment-specific Spring profiles via SPRING_PROFILES_ACTIVE to switch database drivers and configurations
• •Declare Redis as a service type in render.yaml, not under databases, to ensure REDIS_URL is injected properly
• •Use multi-stage Dockerfile builds to cache Maven dependencies before copying source, improving layer reusability

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