Define properties in a custom file, for Spring data JPA - spring-boot

Question

I have a custom properties file for my spring boot application for database configurations. I use spring data JPA for persistence, By default spring boot choose application.properties to load the configurations.
How to avoid it and use any custom file, to read the database configuration on application startup
Example : database-connection.properties
spring.datasource.driver-class-name=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://ip:5432/HP
spring.datasource.username=hpadmin
spring.datasource.password=hp#12345
Thank you

Answer 1

You will avoid future complications if you use just one and the classic application.properties.
Spring requires more than just database configurations so replace the entire application.properties by a simple database-connection.properties is not a good idea.
Anyway, if you need to add more properties alongside application.properties you could use
one of the following approaches:
PropertyPlaceholderConfigurer
You could load extra properties alongside the application.properties or replace it entirely if you delete the application.properties
In your main class:
#Configuration
public class PropertiesConfiguration {
#Bean
public PropertyPlaceholderConfigurer properties() {
final PropertyPlaceholderConfigurer ppc = new PropertyPlaceholderConfigurer();
ppc.setIgnoreResourceNotFound(true);
final List<Resource> resourceLst = new ArrayList<Resource>();
resourceLst.add(new ClassPathResource("database-connection.properties"));
ppc.setLocations(resourceLst.toArray(new Resource[]{}));
return ppc;
}
Shell
You could replace the entire application.properties file at the moment of run of your jar with spring parameter --spring.config.location
java -jar app.jar --spring.config.location=/foo/bar/database-connection.properties
PropertySource
Similar to PropertiesConfiguration but without java code, just #annotations
#PropertySources({#PropertySource(value = "classpath:database-connection.properties")})
public class Application {