Spring Boot: Datasource properties

Question

I have a confusion regarding datasource autoconfiguration in Spring-boot. From what I have read, we have to specify the datasource properties in the form spring.datasource.* . But my application code works fine if I supply property name in the form SPRING_DATASOURCE_* . Is there any reason that I am missing, due to which it works? Please clarify.

Answer 1

I think You've come across a feature of spring boot called Relaxed Binding .

It allows using some "relaxed" rules for binding to ConfigurationProperties. So essentially both ways of definition have the same effect in your application.

Here you can find a link to the relevant chapter in the official documentation

Answer 2

Spring Boot has so-called Relaxed Binding https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-external-config-relaxed-binding which allows you to define configuration in different ways:

• acme.my-project.person.first-name acme.myProject.person.firstName
• acme.myProject.person.firstName
• acme.my_project.person.first_name
• ACME_MYPROJECT_PERSON_FIRSTNAME

The latter is often used when passed via environment variables.