Initialize Project

First, Initialize your spring-boot project. Then go to application.properties and add below config:

server.port=8090

Second, Add your dataBase dependency in pom.xml file (In this project dataBase is postgres)

 <dependency>
      <groupId>org.postgresql</groupId>
      <artifactId>postgresql</artifactId>
      <version>42.2.8</version>
 </dependency>

Then go to application.properties and add below config

  spring.datasource.url=jdbc:postgresql://localhost:5432/counting
  spring.datasource.driver-class-name=org.postgresql.Driver
  spring.datasource.username=********
  spring.datasource.password=********
  spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
  spring.jpa.hibernate.ddl-auto=create-drop
  #spring.jpa.hibernate.ddl-auto=update
  spring.jpa.show-sql=true