Starting

Today I will show you guys how easy is to start and running a Spring Boot application.

So let's go.

First we will access the Spring initialize to start our first project.

Follow the steps:

• Project: Choose gradle project
• Language: Kotlin
• Spring Boot: 2.7.2
• Group: com.myexample
• Packaging: jar
• Java: Java version executing in your machine(Here is Java 11)
• Dependencies: Spring Reactive Web.

After the previous step just click on Generate

Importing and writing some code

You can import the project to you favorite IDE. Here I am using Intellij IDEA.

With your project imported you can see the following structure

now we will create two classes inside the package com.myexample.demo

MyFirstRoute

 package com.myexample.demo

import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.http.MediaType
import org.springframework.web.reactive.function.server.coRouter

@Configuration
class MyFirstRoute {

    @Bean
    fun route(handler: MyFirstHandler) = coRouter {
        accept(MediaType.APPLICATION_JSON).nest {
            "v1".nest {
                GET("/hello", handler::handle)
            }
        }
    }
}

MyFirstHandler

package com.myexample.demo

import org.springframework.stereotype.Component
import org.springframework.web.reactive.function.server.ServerRequest
import org.springframework.web.reactive.function.server.ServerResponse
import org.springframework.web.reactive.function.server.bodyValueAndAwait

@Component
class MyFirstHandler {

    suspend fun handle(request: ServerRequest): ServerResponse{
        return ServerResponse.ok().bodyValueAndAwait("That's so easy!! ")
    }
}

Now our project structure it looks like that

To test our project you just need to run the main class DemoApplication. With the app running go to your browser and type the address http://localhost:8080/v1/hello.

That's it.