So in a spring boot application, application. properties file is used to write the application-related property into that file. This file contains the different configuration which is required to run the application in a different environment, and each environment will have a different property defined by it.Dec 15, 2564 BE  

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spring.h2.console.enabled=true

spring.datasource.url=jdbc:h2:mem:dcbapp

spring.datasource.driverClassName=org.h2.Driver

spring.datasource.username=sa

spring.datasource.password=password

spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

https://www.geeksforgeeks.org/spring-boot-application-properties/