Spring Boot

Create a Spring Boot Application from Spring Initializer using Maven as the build management.
Import the project in Eclipse.
Run the project using ./mvnw spring-boot:run -DSkipTests
Develop a Rest Controller for exposing the Rest APIs . Annonate the controller class with @RestController
Generated application has the main class annotated with @SpringBootApplication

Thymeleaf UI
Create a Controller class with @Controller annonation
Keep returning the View as string.
The View file 

Spring boot actuator : https://www.baeldung.com/spring-boot-actuators

Spring Boot JPA

Traditionally, JPA “Entity” classes are specified in a persistence.xml file. With Spring Boot, this file is not necessary and “Entity Scanning” is used instead. By default, all packages below your main configuration class (the one annotated with @EnableAutoConfiguration or @SpringBootApplication) are searched.


Cowin vaccine availability

1. Create a spring boot app which polls Cowin API and sends mail on availability
2. Created a Spring scheduled job to poll the Cowin APIs
3. Used Spring Web client to execute the HTTP requests. This is a reactive library
4. Json Response is returned from the Web client. 
5. Json response is deserialized using Jackson.
6. To map the Json structure in the response created the Java model classes.
7. Used Spring email to send the emails

Spring Data repositories usually extend from the Repository or CrudRepository interfaces. If you use auto-configuration, repositories are searched from the package containing your main configuration class (the one annotated with @EnableAutoConfiguration or @SpringBootApplication) down.

Used Spring Boot caching to cache the entities in the Java memory.