Today 3rd. April 2021 I released the GWT Boot Starters 1.0.0 to Maven Central which is the first final version of GWT Boot Starters. In this short article I’ll show you how GWT Boot Starters can help us to build our GWT web apps easier and faster.

GWT Boot: Java on the Browser with GWT Transpiler

What is GWT (“gwit”, aka. Google Web Toolkit)?

GWT is a development toolkit for building and optimizing complex browser-based applications. Its goal is to enable productive development of high-performance web applications without the developer having to be an expert in browser quirks, XMLHttpRequest, and JavaScript. It’s Open Source, completely free, and used by thousands of developers around the world since 2007…

Or how you can get the best out of it…

© Java Oracle

Java is a robust language and bla bla bla. We already know this since Y2K Millennium Bug but most of us actually really realize the advantages of Java from Bruno Borges, one of the famous Java Champion (although in the beginning I thought people speak Portuguese in Brazil and not Java).

If you are just starting with Java, see Java live in action bla bla bla you need to know to start working with the frameworks. Yes, without frameworks your life is useless.

What Are Java Frameworks? Why Frameworks?

Hopefully you are aware now why we…

This is a second part of the article about UI (User Interface) development in 2020. Here is the first part: UI Development Trend in 2020: Declarative UI to Rule Them All.

Today I’m talking about Web apps UI development. As we have seen in the UI framework development history, we have moved from server-side UI development to the client-side or browser-side UI development. To be clear, Web browser represents the native app for many desktops today. With ElectronJS you can deliver your Web apps to the desktop for any operating system available. ElectronJS apps which are Web apps are platform…

In year 2020 it seems that major players in UI development are agreed in how we, developers, should design the UI (User Interface) of our apps or web apps. In this article I will show you the current UI development trends with different frameworks and environments available in 2020 and sum them up. Later I’ll take a look on the UI development trends in Java / GWT / J2CL.

Design Trend in UI


SwiftUI has renovated the whole UI development in Apple world. Native on all Apple platforms with all those nice design tools set a very high bar for UI development. Also move…

In the article “Using IndexedDB in Web Browser — All in Java” Mrs. Gwitany and Dr. Jackl told us how we could use Java with Elemental2 to build a simple prototype based on WebAPIs for IndexedDB. This time they’ll show us how to build the already shown code to be testable and maintainable with all the Design Patterns we already know from our server-side experiences with Java.

In the server-side Java world we use following patterns all the time, so we want to use them in the Web browser apps as well:

  • Dependency Injection: we inject dependent object into a…

I would like to know, what are the obstacles for you as Java developers not using Java as programming language for writing Web browser apps. Web browser apps are client-side and not server-side Web apps. For running Web browser apps you mostly don’t need a Web server, you just need HTML, CSS and JavaScript files.

I’m doing Web browser programming using Java with GWT / J2CL and surely it is not perfect because the Web browser APIs feel very JavaScript but I have following advantages:

  1. We use Java as the language
  2. We have the best ecosystem like libraries, frameworks, build…

We had a chance to use GWT in our internal Hackathon and here are our impressions and feedbacks for GWT / J2CL / Java development on the Web Browser.

The Task: build a simple UI frontend web app which just shows other web apps contents (micro frontends with HTML, JS). So it is just like building a portal (main frontend UI) with some portlets (micro frontends). If you don’t know what it is check out my article: From Portlets to OpenSocial Gadgets to Progressive Web Apps. We chose Material Design for the UI design.

The Team: we were four Java…

This story isn’t about Java Applet or Java WebStart, this story is a pure JavaScript story presented by Mrs. Gwitany and Dr. Jackl, generally known as GWT and J2CL.

In the world of web browser JavaScript is the king, so all the Web APIs are based on JavaScript. The Mozilla Developer Network (MDN) is the source of truth for the Web APIs. It looks awesome and it explains everything with examples very nicely. So if you want to build web apps you surely need the MDN documentation.

MDN is Your Best Friend for Web APIs

Lesson 1: consider Mozilla Developer Network (MDN) and Web APIs as your best…

Last time we saw how we can reuse our Java code in JavaScript from my article “Web Browser Programming in Java”. Today we’ll take a look on how we could call the JavaScript APIs, web apps and frameworks from our Java code and at the end to transpile them back to JavaScript so that it will be runnable on the web browser.

To see how we could do this, it is important that we understand the process on how Java with GWT ( or J2CL ( communicates with JavaScript. For this purpose we have the JsInterop which work as a…

AKA: Shopee Mendukung Penjualan Obat-Obat Gelap yang Tidak di Registrasi

Oleh: Apoteker dari ITB (Institut Teknologi Bandung) Indonesia sejak 55 tahun lalu

Kalau beberapa tahun lalu kita bisa belanja di pasar tradisional, toko di pinggir jalan raya disusul oleh supermarket Indomaret, Alfamart dan supermarket-supermarket serta mall lainnya. Kemudian, terutama di jakarta, yang sekarang menjamur adalah berbelanja melalui toko online alias e-commerce seperti Shopee, Bukalapak, Lazada, TokoPedia, dll. Sekarang barisan tempat belanja tradisional ini ditutup oleh banyak sekali online shops, seperti diatas.

Jakarta — The City That Never Sleeps

Semua ini tentu untuk mempermudah konsumen belanja dengan harga yang kompetitif dan dengan mutu yang terjamin. Seperti contoh berbelanja…

Dr. Lofi Dewanto

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