RESTful API with Spring Boot and Kotlin

Module 1: Getting Started with Kotlin Programming Language

• Introduction to Kotlin
• How Kotlin Works with the JVM?

Module 2: Kotlin Fundamentals

• In this section, we will explore the fundamentals of Kotlin.
• val & var variables in Kotlin
• Basic Types - Int, Long, Double, String
• Conditionals - IF and WHEN block
• Ranges, Loops
• while & do-While
• break, labels and return

Module 3: Functions in Kotlin

• Defining and Invoking Functions
• Default Value Parameters & Named Arguments
• Top-Level Functions and Top-level Properties

Module 4: Classes, Interfaces and Inheritance

• Introduction to class - Creating a class and objects
• Primary Constructors
• Secondary Constructors
• initializer code using init block
• Data Classes
• Custom Getters and Setters
• Inheritance - Extending Classes
• Inheritance - Override Functions, Variables
• object keyword for creating instance of the class
• companion object Keyword
• Interfaces
• Interfaces - Handling Conflicting Functions
• Interfaces - Defining and Overriding Variables
• Visibility Modifiers
• Type Checking, Casting and Smart Cast
• Enum class

Module 5: Nulls in Kotlin

• Nullable & Non-Nullable types in Kotlin
• Safe Call(?), Elvis Operator(?:) & Non Null Assertion(!!) to deal with Null Values
• Invoking or assigning a Nullable Type to a Non-Nullable Type

Module 6: Collections, Arrays & Lamda Expressions

• Introduction to Collections
• Introduction to Lamda Expressions
• Lambdas and Higher Order Functions
• Filter Operations on Kotlin Collections
• Map Operations on Kotlin Collections
• FlatMap Operations in Collections
• Working With HashMaps
• Lazy Evaluation of Collections using Sequences
• Nullability in Collections

Module 7: Exceptions In Kotlin

• Handling Exceptions using try-catch

Module 8: Scope Functions

• Introduction to Scope Functions
• Apply & also Scope Function
• Let Scope Function
• with & run Scope Function

Module 9: Getting Started with Kotlin and Spring Boot

• Overview of the app & Project Setup
• Build a Simple Endpoint - Greeting Controller
• Constructor Injection in Spring
• Setting up different profiles in Spring Boot
• Set up Logging in Kotlin

Module 10: Integration/Unit Testing using Junit 5

• Introduction to Automated Tests & Setting up JUnit5
• Integration Test for Controller
• Unit Test for Controller - Using the Mockk Mocking library

Module 11: Introduction to RESTful Web Services

• Introduction to RESTful Web Services
• Beginners Guide to REST
• Richardson Maturity Model
• Introduction to Postman
• Assignment - Create Data Model
• Assignment Review - Create Data Model
• Introduction to Spring RestTemplate
• Using WebFlux to Display API Data
• URI Components Builder
• Rest Template Examples
• Going Reactive with Spring WebClient

Module 12: RESTful WebServices with Spring MVC

• Introduction to RESTful Web Services with Spring MVC
• New Spring Boot Project
• Spring Boot Command Line Runner
• Introduction to MapStruct
• Using MapStruct
• MapStruct IntelliJ Plugin
• Category Service
• List Categories
• Testing with Postman
• Assignment - Create Get API for Customers
• Assignment Review
• Create New Customer with Post
• Update Customer with PUT

Module 13: Unit Testing Controller layer (Web Tier)

• Setting up the Unit Test for the CourseController
• Unit test for the Post Endpoint in CourseController
• Unit test for the GET Endpoint in CourseController
• Unit test for the PUT Endpoint in CourseController
• Unit test for the DELETE Endpoint in CourseController

Module 14: Bean Validation using Validators and ControllerAdvice

• Name and Category as Mandatory using @NotBlank Annotation
• Implement Custom Error Handling using ControllerAdvice pattern
• Handle Global RuntimeException using ControllerAdvice Pattern

Module 15: Custom JPA queries using Spring Data JPA and DB Layer testing using @DataJpaTest

• Retrieve Courses by Name using JPA Query Creation Function
• Retrieve Courses by Name using Native SQL query
• Testing Mutliple sets of Data using @Parameterized test

Module 16: GET Endpoint to retrieve Courses By Name using @RequestParam

• Use existing GET endpoint to retrieve Courses by Name
• Write Integration test to retrieve course by Name

Module 17: Entity RelationShips using Spring Data JPA

• Adding Instructor Entity into the Course Catalog Service
• Adding the relationship in the Entity Class
• Instructor Controller to Manage Instructor Data
• Update CourseService to validate Instructor Data
• Fix the CourseController Integration Tests
• Fix the CourseController Unit Tests

Module 18: Integrating with Postgres DB

• Setting up the Postgres DB and App to interact with Postgres
• Test the app with Postgres DB

Module 19: Integration Testing using TestContainers

• Setting Up TestContainers for the Integration Test
• Configure @DataJpaTest with TestContainers

Module 20: Java & Kotlin Interoperability

• Invoking Kotlin Code from Java Class
• Invoking Java Code from Kotlin
• Useful JVM annotations in Kotlin