Download Build RESTFUL APIs using Kotlin and Spring Boot

What you would learn in Build RESTFUL APIs using Kotlin and Spring Boot course?

Kotlin is the Modern compact, secure programming language and is among the most well-known JVM languages in the current time and time.

It is also compatible with Java and other languages and offers a variety of ways to reuse code between different platforms to create productive code.

This course will concentrate on the use of Kotlin to support server-side development using the SpringBootframework. This is an interactive course that will cover these two subjects:

• Learns Kotlin Basics, which are essential in Java Designers

• Create RestFul APIs using SpringBoot and Kotlin.

Part 1: Starting the Course

• This section outlines the goals of the course as well as the prerequisites needed for the successful completion of this course.

2. Getting started With Kotlin Programming Language

• In this article, I will present Kotlin Programming Language and why it is a great language to develop enterprise applications.

  • Introduction to Kotlin

  • How does Kotlin work With the JVM?

Section 3: Kotlin Fundamentals

• In this part, we will look at the basics of Kotlin.

  • the variables Val and var within Kotlin

  • Basic Types: Int, Double, Long String

  • Conditions - When and if block

  • Loops, Ranges

  • while and do-While

  • Labels, break and return

Section 4 The functions of Kotlin

• In this section, we'll be introduced to functions in Kotlin and various ways of declaring and making use of these functions.

  • Definition and Invoking Functions

  • Default Value Parameters & Named Arguments

  • Top-level Functions and top-level properties

Section 5 Classifications, Interfaces, and Inheritance

• Within this part, we'll be taught about inheritance, classes, and interfaces in depth.

  • Class introduction - Making an object and class

  • Primary Constructors

  • Secondary Constructors

  • initializer code using init block

  • Data Classes

  • Customized Setters and Getters

  • Succession & Inheritance Extending Class

  • Inheritance-Override Functions, Variables

  • object keyword to create an instance of the class

  • Keywords for companion objects

  • Interfaces

  • Interfaces - handling conflicting functions

  • Interfaces - Define and Overriding Variables

  • Visibility Modifiers

  • Type Checking and Casting, as well as Smart Cast

  • Enum class

Section 6 nulls found in Kotlin

• In this section, we'll be taught about how to handle nulls in Kotlin

  • Nullable & Non-Nullable types in Kotlin

  • Secure Contact(?) , Elvis Operator(? :) & Non Null Assertion (!!) to address Null Values

  • Assigning or calling an un-Nullable Type to a Non-Nullable Type

Section 7 Collections, Arrays, and Lamda Expressions

• Within this segment, I'll explain arrays, collections, and lambda expressions within Kotlin

  • Introduction to Collections

  • The Introduction Lamda Expressions

  • Lambdas as well as Higher-Order Functions

  • Filter Operation on Kotlin Collections

  • Map operations on Kotlin Collections

  • FlatMap Operations in Collections

  • Working with HashMaps

  • A lazy Evaluation of Collections Using Sequences

  • Nullability of Collections

Section 8: Exceptions In Kotlin

• This article will go over the different kotlin options and the methods to deal with the issues.

  • Handling exceptions using try-catch

Section 9: Scope Functions

• This article will explain the various scope functions available in Kotlin and how to use it.

  • An Introduction Scope Functions

  • apply and also apply and also the Scope function

  • Let Scope Function Function

  • with run Scope Function and with

Section 10: Getting started by using Kotlin as well as Spring Boot

• In this article, I will give a background of the app we will create and then build an accessible API.

  • The app's overview and the project Setup

  • Create a simple endpoint the Greeting Controller

  • Constructor Injection in Spring

  • Making profiles for different Profiles in Spring Boot

  • Logging is set up in Kotlin

Section 11: Integration/Unit Testing with Junit 5

• In this article, I will provide code and discuss how to write various kinds of tests with spring boot and Kotlin.

  • Introduction to Automated Tests and Configuring JUnit5

  • Integrity Test of Controller

  • A Unit Test to test the Controller Utilizing Mockk, the Mock Mocking library

Chapter 12: Create your Course Catalog Service

• We'll develop an online Course Catalog Service to manage the Courses within this area.

  • Create the Course Entity and CourseDTO

  • Create CourseRepository and Configure JPA in the application.yml file

  • Make the POST Endpoint available for the addition of a new Course I.

  • NTEgration test for the POST endpoint with JUnit5

  • Develop your Get Endpoint to retrieve all Courses

  • Integrity test to the GET endpoint to get all courses

  • Create an Update Endpoint to make changes to the Course

  • Test of integration for PUT endpoint by using JUnit5

  • Create the DELETE endpoint to remove the Course

Section 13: Unit Testing Controller layer (Web Tier)

• This section will write code and discover how to write unit tests for the controller.

  • The unit test is to be administered by the CourseController.

  • The unit test is for the post Endpoint in CourseController

  • A unit test to determine this GET endpoint of CourseController

  • Testing the Unit for the PUT Endpoint using CourseController

  • Test unit for DELETE's Endpoint CourseController

Section 14: Bean Validation with Validators as well as ControllerAdvice

• This section will create code and explore the various ways to implement bean validations and handle issues by using the ControllerAdvice Pattern.

  • Name and Category are mandatory using @NotBlank annotation

  • Implement Custom Error Handling using ControllerAdvice pattern

  • Handle Global RuntimeException using ControllerAdvice Pattern

Section 15: Custom JPA queries using Spring Data JPA and Testing DB Layer using @DataJpaTest

• In this presentation, we will discuss how to create custom JPA queries as well as the methods to evaluate the DB layer with the DataJpaTest

  • Find Courses by Name using JPA Create Query Function

  • Retrieve Courses By Name using Native SQL query

  • Testing multiple sets of data using @Parameterized test

Section 16 Get Endpoint to retrieve the name of the course by using @RequestParam

• In this section, we will program and understand the use of RequestParam within the controller endpoint.

  • Utilize the existing GET endpoint to get Courses by Name

  • Test for Write Integration to find course information by name

Section 17: Entity RelationShips made using Spring Data JPA

• In this part, I will describe the method to express relations in JPA by using Entity and data classes in Kotlin

  • The Instructor's Entity can be added to Course Catalog Service. Course Catalog Service

  • In the Entity Class

  • Instructor Controller to Manage Instructor Data

  • Update CourseService to verify the instructor's Data

  • Correct the CourseController Integration Tests

  • Make the CourseController Unit Tests pass.

Section 18: Integrating the Postgres DB

• In this section, we'll write code and discover how to connect the postgres DB into the service for catalogs of courses.

  • Configuring for Postgres DB and App to connect to Postgres

  • Try the app using Postgres DB

Section 19: Integration Testing with TestContainers

• Then, we'll program and understand how to integrate the test containers to run an integration test.

  • Setup of TestContainers that will be utilized for the Integration Test

  • Configure @DataJpaTest using TestContainers

Section 20: Java & Kotlin Interoperability

• Within this part, we'll program and understand the interoperability of Java and Kotlin.

  • Utilizing Kotlin Code from Java Class

  • The invocation of Java Code from Kotlin

  • Utilized JVM annotations for Kotlin

When you finish this course, you'll be confident in writing code with Kotlin. Koltin Programming language and Create RestFuL APIs with SpringBoot as well as Kotlin.

Content of the Course:

• Kotlin Programming Language and its advantages
• Write Code with Kotlin Programming Language
• Building applications using Kotlin
• Build RestFul Services using SpringBoot and Kotlin
• Test Kotlin using JUnit5
• Kotlin as well as Java Interoperability
• Incorporate Spring Data JPA with Kotlin
• Testing integration DB Layer using TestContainers & JUnit5
• Unit Testing Functions calls using Mockk Library

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