Introduction

ionSpring makes it easy to create web application for IBM i platform.

This is not a new framework but rather an opinionated and very light preconfiguration of existing frameworks and some small adapters for IBM i.

Open source under Apache Software License 2.0

The following frameworks/libraries are used:

• Spring Boot: the leading Java application framework
• Vaadin Flow: A Java web framework
• Karibu-DSL: Kotlin extensions and DSL library for Vaadin Flow

Getting started

• Create a Spring Boot Project with Spring initializr
• Decompress the generated project and open it with your IDE (Intellij IDEA is recommended)
• Edit the build.gradle.kts file. Add the following two lines inside the dependency block:

implementation("org.ionspring:ionspring-starter:0.1.0")

• In src/main/kotlin, in the package of the application, create a new Kotlin class with the following content:

package com.example.demo

import com.github.mvysny.karibudsl.v10.span
import com.github.mvysny.karibudsl.v10.textField
import com.vaadin.flow.component.html.Span
import com.vaadin.flow.component.orderedlayout.VerticalLayout
import com.vaadin.flow.data.value.ValueChangeMode
import com.vaadin.flow.router.PageTitle
import com.vaadin.flow.router.Route

@Route("")
@PageTitle("Demo home")
class HomeView : VerticalLayout() {
  lateinit var span: Span

  init {
    textField("Your name") {
      valueChangeMode = ValueChangeMode.EAGER
      addValueChangeListener { e ->
        if (e.value.isBlank()) {
          span.text = "What's your name?"
        } else {
          span.text = "Hello ${e.value}"
        }
      }
    }
    span = span("What's your name?")
  }
}

• Start the application from your IDE
• Open https://localhost:8080 in your browser:

Where to go next?

• Project Github repository
• Examples Github repository