Coming Up for Air

Easily Switching JDKs

Development environments can get fairly complex, and making sure you’re using the right version of some library or another can be annoying on the best of days. I have a situation like that where my "day job" requires (still, and hopefully not for much longer) JDK 8, but my side projects, learning efforts, etc. can use a more modern version.

Years ago, Charles Nutter shared a shell script he uses to switch JDKs. I’ve been happily using it, but I’ve made some minor tweaks, so I thought I’d share my version here in case it helps someone (and make it easier for me to find in the future ;).

UPDATE: It seems the original author is Nick Sieger. Thanks to you as well, Nick, for a great little utility!

Java to Kotlin Conversion Question. And Answer.

Recently, in the #kotlin channel on Freenode, a user asked a question about what was happening to his Java code when using IDEA’s convert-to-Kotlin functionality. He left before anyone had the time to answer, and while he likely doesn’t read my blog, I’m going to answer his question here anyway. :)

Getting started with Micronaut: Kotlin, JPA, and JWT

The Micronaut guides are really pretty good. So far, I’ve found just about everything I need. The biggest obstacle so far has been that, at times, the content was scattered across several guides and usually in the wrong language: I’m interested in Kotlin, but the guides seem to be mostly in Java or Groovy. This isn’t surprising, as budgets are limited, of course. What I would like to do here, then, is provide a small sample app, written in Kotlin, that demonstrates how to set up the project, configure and use JPA, and secure the app with JWT.

Kotlin+Micronaut and IDEA Don't Get Along Together

Recently, I’ve been experimenting with Micronaut, a new-ish "modern, JVM-based, full-stack framework for building modular, easily testable microservice and serverless applications" from the makers of Grail. So far, I’ve been really impressed. The documentation has been excellent, and the framework is very easy to get started with. I have, though, run in to some trouble writing tests, or, more accurately running tests. I spent far too much time trying to figure it out until I finally broke down and asked, and it turns out that it’s IDEA’s fault. While that’s a bit annoying, there is a workaround, which I’d like to document briefly here.

Merry Christmas, 2018

I hope you all have a merry Christmas. More importantly, I hope you take the time to think about the birth of the child that gives Christmas its meaning.

"The birth of Christ is the timeless event that leads us to believe that the cries of a broken world have actually been heard. A Savior has been born. The vault of Heaven truly has been opened" -- Author Unknown

A Possibly Silly Question about Java Visibility

This morning, I was asked a question by a coworker that we both thought we knew the answer to: if a method is protected, can other classes see that method? The answer surprised us: maybe. :) It’s a pretty simple, basic question, but I thought I’d mention it in case there’s a beginner wondering, or more senior developers, such as myself and my team mate, that just have it wrong. :)

Getting Started with Eclipse MicroProfile, Part 8: The Conclusion

Many times, one of the hardest parts of getting started with a particular piece of technology is figuring out how to get started. :) In this series, I’ve used an extremely simple project to show how to do just that with a number of MicroProfile implementations. Obviously, a real application will have many more concerns than we dealt with in this application, but what this effort gave us is working, runnable, and testable build for six different MicroProfile implementations. What I’d like to do in this final installment in the series, is give some closing thoughts.

Getting Started with Eclipse MicroProfile, Part 6: Hammock

This time around, we’re going to start looking at a slightly different take on MicroProfile implemenations. Whereas Payara Micro, Thorntail, OpenLibery, and TomEE are all based on application servers (albeit stripped down versions), our implementation in this post, Hammock, is based on a CDI container. Rather than start what amounts to an app server under which a web is deployed, we’ll be spinning up a plain ol' CDI container, which will look for CDI beans to load/start/etc. That may sound weird, and I may not be describing it clearly, so let’s just jump in to the code and take a look.

Getting Started with Eclipse MicroProfile, Part 5: TomEE

In this installment of our series, we’re going to take a look at the last of what I think of as the more traditional, app-server-based/-spawned implementations, TomEE. TomEE is a fully Java EE-enabled distribution of the venerable workhorse Tomcat, and comes with support for creating MicroProfile applications, so let’s see what that looks like.

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