How can I override Spring Boot application.properties programmatically?

Question

I have jdbc property files which I take from external configuration web-service In spring boot in order to set mysql props it's easy as adding those to application.properties:

spring.datasource.url=jdbc:mysql://localhost/mydb
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

How could I override those programticlly in my app?

same goes for Spring-batch props:

database.driver=com.mysql.jdbc.Driver
database.url=jdbc:mysql://localhost/mydv
database.username=root
database.password=root

Answer 1

You can add additional property sources in a lifecycle listener reacting to ApplicationEnvironmentPrepared event.

Something along the lines of:

public class DatabasePropertiesListener implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {
  public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
    ConfigurableEnvironment environment = event.getEnvironment();
    Properties props = new Properties();
    props.put("spring.datasource.url", "<my value>");
    environment.getPropertySources().addFirst(new PropertiesPropertySource("myProps", props));
  }
}

Then register the class in src/main/resources/META-INF/spring.factories:

org.springframework.context.ApplicationListener=my.package.DatabasePropertiesListener

This worked for me, however, you are sort of limited as to what you can do at this point as it's fairly early in the application startup phase, you'd have to find a way to get the values you need without relying on other spring beans etc.