Over the years, I’ve found myself processing a set of data and storing it in a Map, say, something like Map<Long, List<String>> (think something like a list of Room objects, keyed by a building id). I have found myself writing it something like this (in non-idiomatic Kotlin): val foo = map.get(key) if (foo == null) { foo = MutableList<String>() map.put(key, foo) } foo.add.....
Read More ›One of the great things about Spring Data Repositories is that they provide a number of query methods out of the box, with the ability to add additional queries simply by adding carefully named methods to the interface, and Spring generates the actual implementation for you. Sometimes, though, you do need to color outside the lines a bit. Thankfully, Spring allows us to do this. You just have to ask it nicely. Here’s.....
Read More ›Thanks to haste and some sloppy copy-and-paste, today I deleted the wrong remote Git branch. There’s nothing like learning in a panic, but that’s what happened. Here’s what I learned on how to fix that. While watching that all-important branch being deleted erroneously is a heart-stopping moment, as it turns out, restoring the deleted branch is Super Easy. Barely an Inconvenience. All you need to.....
Read More ›The Red Hat twitter account just asked this question: "Communities grow by uplifting others. What is one piece of advice you’d offer to a new developer? Reply below and then check out some advice from #RedHatter @somalley108." Here’s my input. As a general rule, if you’re writing software, you’re probably pretty intelligent. That intelligence, while important, of course, can also become a hindrance. For example, I’.....
Read More ›The project I’m working on is using Mockk in the unit tests. It’s a great library that has made true unit testing so much easier. I ran into a problem, though, where I needed a method I was mocking to return the value it was receiving. To be more specific, we were passing an object to a Spring repository method that had been built inside the method to test, and, to.....
Read More ›Merry Christmas! For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life. -- John 3:16...
Read More ›A user in #kotlin on Freenode asked how to run a Kotlin script. While the Kotlin docs are pretty clear on how to do that, I thought I’d make a quick post to show how to make an easily executable Kotlin script. The first step is to name the file with a .kts extension: test.kts println("Hello, world!") You can then run it like this: $ kotlinc -script test.kts Hello, world! That.....
Read More ›With my recent job change, I’ve gotten a chance to use Spring Boot in anger a bit. It’s been fun, and I’ve learned a fair bit about the current state of Spring (I still love you, Jakarta EE!). One of my tasks involved adding a query method to a repository, and I wanted to make sure the query worked before I pushed it upstream. To do that confidently, of.....
Read More ›I recently found myself writing a test that needed a database. Unfortunately, our testing database, H2, doesn’t support all of the features of our production database, PostgreSQL. This meant that the Flyway migrates used to manage the production database broke in the testing environment. The fix for this turned out to be pretty simple. To set the scenario, imagine you have this table: CREATE TABLE foo ( id bigint PRIMARY KEY, some_json JSONB ); The.....
Read More ›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.....
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