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avatar-kpenzhorn.jpg Karl Penzhorn

All Posts by Karl Penzhorn

Deploy a Spring Boot Application into Tomcat

Deploying applications is hard. Often you need console access to the server from which you pull the latest code and then manually instantiate into your container. In this tutorial you’ll see an easier way using Tomcat: you’ll create an authenticated web app and deploy it through the browser using the latest versions of Tomcat, Spring Boot, and Java. Since version 9, Oracle has decreased the Java release cadence to six months so major version numbers...

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Build an iOS App with React Native and Publish it to the App Store

Apple’s App Store is the holy grail for mobile developers. With React Native you can develop native apps for Android and iOS using a single code-base but getting things ready for publishing can be tricky, especially if you are starting with an originally Android-only application. Here you’ll be starting with the code from a previous monster Okta blog post designing and publishing a calculator-like app on the Android Play store, which includes authentication via Okta....

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Design and Develop an Android App with React Native and Publish to Google Play Store

As mobile app usage is expected to continue to grow, now is as good a time as any to get into the market. Android is by far the most popular OS worldwide and the dominant way to get Android apps to phone users is the Google Play Store. In this tutorial, you’ll build a React Native app and I’ll walk you through everything from how to pick a design, as well as setting up your...

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Build and Test a React Native App with TypeScript and OAuth 2.0

React Native is one of the most popular ways of creating mobile apps. Building on the success of React, it ties together native components for both Android and iOS using a shared JavaScript code-base. However, JavaScript has come under fire recently for not being type safe which can lead to a loss of developer trust. Enter TypeScript, which allows type annotations to be added to existing JavaScript code. One requirement of many mobile apps is...

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Build a Basic CRUD App in Android with Kotlin

Kotlin was recently given official Android support status by Google, but it remains difficult to understand for many developers. The best way to start is by creating a complete app yourself, which you’ll do in this tutorial. In this tutorial, you’ll use Spring Boot for the API that powers your Android (+ Kotlin) mobile app. Spring Boot is a great way to create a robust REST API with a minimal amount of code. I’m going...

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Create a Basic Android App without an IDE

Virtually every Android tutorial uses Android Studio to create and develop an app. This isn’t great for learning since you don’t see how things work, namely The components that make up an Android Studio project How builds are setup and configured What parts comprise the source Software development is about files and in this tutorial we’re going to go through every file in a basic Android project – first by examining what Android Studio outputs...

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