Java - Spring Boot

Java - Spring Boot Training Track - Lesson 1

Pre-requisites: If you are not familiar with Java, please take the Java Fundamentals Course before you start with this.

Spring Boot starter

Follow this official guide to kickstart your own github project - https://spring.io/quickstart

• Once you have a first cut template in place checkin your code into github and share the project with the team.

Maven/Gradle basics

If you do not understand Maven/Gradle - They are popular package managers for Java.
Do try to understand them - No particular article - Just Research.

Understanding important core concepts of Spring / Spring Boot

• Spring IOC and Dependency Injection Reference - https://www.baeldung.com/inversion-control-and-dependency-injection-in-spring
• Spring Boot Annotations. This could be a good starting point - https://springframework.guru/spring-framework-annotations/
• Spring JPA - https://www.baeldung.com/the-persistence-layer-with-spring-data-jpa
• Spring Data Repositories - https://www.baeldung.com/spring-data-repositories
• Spring Boot with Hibernate - https://www.baeldung.com/spring-boot-hibernate
• Spring Boot Security - https://www.baeldung.com/spring-boot-security-autoconfiguration

Learn the above with examples and try it out.

Goal

End of the learning you should be able to

• Launch a new Spring Boot app/ Able to understand an existing Spring Boot App
• Understand How IOC works and what is dependency injection
• Able to use annotations correctly
• Able to write a new GET/POST API in the right fashion
• Able to write Services and use them to perform some operation based on your request
• Understand how JPA works and create a DB connection with any DB using Hibernate
• Follow best practices with JPA, Spring Data and Spring Hibernate
• Able to protect GET and POST API’s using Spring security

Demonstrate understanding

• Once all of the above is done - you can demonstrate your learning and understanding by picking up a use case of your choice that covers all of the above goals and developing your own minor application.
• Build the application, generate a Fat JAR file and launch the application from the JAR file for the demo.

Assignment 1

• Write a Spring Boot App that covers the following use cases
  • User Management - CRUD operations
  • User able to create a password for the first time
  • User login - JWT Token
  • Forgot password
  • OTP based login - Identify a provider for SMS
• Submit a design document - A high level design document on how you would want to approach the whole solution
• This has to be treated as a microservice - come tomorrow we have a new backend that needs authentication and authorization, we should be able to use this.
• Implement RBAC implementation - Your DB schema should have a roles and permissions table to handle the same.
• Code has to be well written, following all best practices
• Prioritise your work and distribute it among the team members
• Each team will have to present their progress once in every two days
• Test cases will be a good to have

Assignment 2

• Make the auth service configurable and as a package
• We should be able to by configuration / by writing minimal amount of code use this service/package for other projects
• The core of the user entity must be defined and clients can add a new extendable class or config to extend the features / columns for a user
• RBAC should be enabled - with roles and granular level permissions
• The auth service should be able to enable / disable 2FA - and to start with 2FA will be OTP based but can be extendable
• Use an RDS as the datastore
• You need to come up with a design document first on how you would approach this problem
• Would like to see additional questions and clarifications on the problem statement
• Once the design is approved - you can start the development.

Timelines

• The first design needs to be completed by three days since the start of the course
• Once approval - and iterations, we can decide the next timelines