Programming tips

Java 8 type inference in generic methods chain call - what might go wrong?

Yesterday I have found this interesting question on Stack Overflow asked by Opal. He faced some unexpected compilation errors when dealing with Java generics and Vavr library. It turned out the root cause of the issue there was not the library, but Java compiler itself. This was pretty interesting use case and it motivated me to investigate it even further. This blog post reveals untold truth about Java generics type inference. Are you ready? :)

Read more →

Micronaut Cookbook

Non-blocking and async Micronaut - quick start (part 1)

If you haven’t heard about Micronaut you have been probably just woken up from deep hibernation. No worries, I’m joking :) Anyway, Micronaut 1.0 GA was released yesterday and it is the right time to play around with it a bit. In this article I would like to show you how easy it is to handle HTTP requests in a non-blocking manner, using just a single computation thread. Interested? Let’s start!

Read more →

Programming tips

What is the most efficient way to iterate collection in Groovy? Let's play with JMH!

I guess you may heard about Groovy’s Collection.each(Closure cl) method - it was introduced 15 years ago [1] and it was a great alternative for a good old for-loop, for-each or even using an iterator approach. You may also heard, that you should not overuse it, because creating a closure to do such simple operation like collection iteration is an overhead. But what if I tell you that nothing could be further from the truth - Groovy’s each method may be faster than iterator or Java’s for-each. Sounds interesting? Enjoy the reading!

Read more →

Programming tips

How Groovy's equal operator differs from Java?

One of the first mistakes people do when starting their journey with Java programming language is using == to compare objects instead calling a.equals(b). When you begin playing around with Groovy you quickly notice that equal operator == is used to compare objects in place of calling a.equals(b). "Finally something more intuitive!" you might think. In today’s article we will dig a little bit deeper to learn avoiding problems equal operator in Groovy may produce.

Read more →