java

Example: How to use javapackager to build a MacOS application bundle

Table of Contents1 - Building a MacOS application bundle with javapackager2 - The longer story3 - The Mac/Java class4 - The three scripts5 - javapackager notes

I recently learned how to use the Java javapackager command to build a macOS application bundle — i.e., a regular macOS application — from a Java application. In this tutorial I’ll show how to create a Mac application bundle from a simple Java class, in this case a Java Swing class.

MacOS/Java AppBundler error: NoSuchFileException: Info.plist

If you’re using the Oracle AppBundler to build a Mac/MacOS application bundle from a Java application and run into this error when running Ant:

NoSuchFileException: <directory path here> Info.plist

I have found that the problem is that I have not set and exported JAVA_HOME. To set and export JAVA_HOME on MacOS 10.12, I use this command in the shell script I use to build my Mac/Java app:

Getting a Mac/Java app ready for Apple’s Mac App Store

Over the last two days I’ve gotten a Mac/Java app ready for Apple’s Mac App Store, including bundling the application as a macOS “.app” application bundle, and signing it so it can be submitted to the Store.

A relatively quick look at my browser history shows that I needed to hit over 260 URLs to get that done. As a wise professor once told me, “Keep learning, keep learning.”

Scala for Java devs: Everything in Scala is an object alvin August 9, 2017 - 11:26am

The new scala-lang.org docs website looks great. It’s also a reminder to me that I probably didn’t stress enough in the Scala Cookbook that everything in Scala is an object, including numbers. (Hopefully I made it clear that functions are objects.) This Scala REPL example shows some of the methods that are available on Scala integers (Int type).

Android Room, database I/O, and Java 8 threads alvin August 7, 2017 - 10:50am

I just started working with the Android Room database persistence library, and since you’re not supposed to run things like database queries on the main thread (the UI thread), I was looking at other ways to run them.

In general, you probably won’t want to run database queries using a Thread, but just to see how Room works, I wrote this Java Thread code, and confirmed that it works as expected: