spring-boot.tar.gz

run-app

live-container

This mini-course will kickstart your journey in developing microservices using the Spring Boot framework. 

You will cover the basics of Model-View-Controller (MVC), microservices, Spring Boot, and the configurations needed to develop any microservices or standalone production-grade Spring application.

You will also learn how to integrate with a database, develop a web UI, and how to handle errors. By the end of this mini-course, you will be able to develop your first application using Spring Boot.

Developing Microservices with Spring Boot

In this lesson, we will learn about configuration management and maintaining profiles.

# Basics of configuration management

Spring Boot, by default, reads the configurations from `application.properties` located at `src/main/resources`. The configuration file can be represented as `application.yml`.  

## Maintaining profiles

Spring Boot allows us to maintain configuration files of different profiles in the format `application-<profile>.properties`, and these properties' files need to be present in `src/main/resources`.   

**Example:** `application-dev.properties` or `application-staging.properties` or `application-prod.properties`.

To activate a profile, we can set the property `spring.profiles.active = dev` in `application.properties`, where `dev` can be replaced with the desired profile name, as shown below: 

`src/main/resources/application.properties`
```
spring.profiles.active = dev
```


The property that is accessed will be looked up in the current activate profile. If not found, it falls back to the one present in the default `application.properties`. If neither property is found and the configuration parameter is marked mandatory, Spring will throw an exception saying the expected property is missing.


We can also annotate beans to be created only when the active profile is set to a certain profile, as shown in the following snippet:






You will learn about configuration management using spring boot.


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Configuration Management

Basics of configuration management