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Sample Kotlin Spring Assignment

This is a simple Kotlin Spring Boot assignment to experiment with Drop Project.

Introduction

In this assignment you will create a small Spring Boot application that uses dependency injection. You will implement two classes:

  1. A service that builds greeting messages.
  2. A command-line runner that uses that service to print a greeting when the application starts.

Requirements

Your project must be a maven project and use the following versions and dependencies:

  • Java: 17
  • Kotlin: 1.9.25
  • Spring Boot: 3.5.10
  • Build tool: Maven

Dependencies:

  • spring-boot-starter
  • kotlin-reflect
  • kotlin-stdlib

Important: Your pom.xml must match these versions and dependencies exactly, otherwise Drop Project will not be able to compile and test your submission.

Instructions

  • Create a Kotlin Spring Boot project in your IDE with the package org.dropproject.samples.samplekotlinspringassignment. Start by creating a file called SampleKotlinSpringAssignmentApplication.kt in that package with the following code:

    package org.dropproject.samples.samplekotlinspringassignment

import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication

@SpringBootApplication
class SampleKotlinSpringAssignmentApplication

fun main(args: Array<String>) {
    runApplication<SampleKotlinSpringAssignmentApplication>(*args)
}

    This is the entry point of your Spring Boot application. Do not modify it.

  • Create a file called GreetingService.kt in the package above and implement a class called GreetingService. This class must:

    • Be annotated with @Service (from org.springframework.stereotype.Service), so that Spring registers it as a bean.

    • Contain a function with the following signature:

      fun greet(name: String): String

      This function must return the string "Hello, <name>!", where <name> is replaced by the argument. For example, greet("World") must return "Hello, World!" and greet("Kotlin") must return "Hello, Kotlin!".

  • Create a file called HelloRunner.kt in the package above and implement a class called HelloRunner. This class must:

    • Be annotated with @Component (from org.springframework.stereotype.Component).
    • Implement the CommandLineRunner interface (from org.springframework.boot.CommandLineRunner).
    • Receive a GreetingService instance through constructor injection.
    • In its run method, use the injected GreetingService to print "Hello, World!" to the standard output (i.e., call greetingService.greet("World") and print the result using println).

  • Create an AUTHORS.txt file in the root of your project with your student (github) id and name. For example:

    <github_id>;John Doe

The idea of this file is to allow group project submissions.

  • Create a zip file of your project and drop it on the area above these instructions. In a few seconds, Drop Project will give you a report with some metrics about your project.