Have you ever wondered how it’s possible that spring-boot is able to pick up whatever you have on the classpath and configure application context to your needs based on some conventions and bit of black magic? In this post, I’m going to dig into spring.factories file on which most of the spring-boot...

How to introduce automated checks that will guarantee that conventions are followed in an example of test naming convention. I’m going to focus on creating automated process that will verify if test names do match conventions. Automation will allow us to forget about the rule because the computer wi...

Have you ever wondered how spring does things? How field annotated with @Autowired is populated? How asynchronous or scheduled methods are discovered. In this post, I’m going to take a deeper look and scratch a bit on the surface of spring internals. I’ll focus on BeanPostProcessor interface which c...

I’ve been working with gradle for some time but I’ve never needed to configure deployment from gradle to maven repository. In this post, I’m going to configure deployment of java based gradle project to the nexus artifact repository. This will include uploading a signed jar itself with javadoc and s...

Some time ago I’ve started working on updating automated tests written in selenium with java. After working a bit with it I’ve noticed that from time to time constructing XPath expression can get ugly. We are writing our tests in pure java and "ugliness" usually comes from string concatenation when ...

Managing and versioning a bunch of connected libraries or services is hard. It doesn’t matter if you are a consumer or a provider of it. In this post, I’m exploring two simple solutions which might come in handy if you develop an ecosystem of libraries/services or when you are a consumer of those. I...

While deep diving into the code I very often see people struggle when testing random changing/things. There is a really simple solution for this and in this blog post, I’m going to show you "one simple trick" that will fix this problem. Read more

At work and in my private time I’m trying to get myself familiar with AWS cloud. Almost all of this is new for me. I know how to setup few things using AWS web console but infrastructure as a code was calling to me and I wanted to give it a spin. My first task was to create VPC with two pairs of sub...

In my free time, I’m trying to learn something new and best of way learning is by doing. To avoid spinning my wheels in vain I’m helping to develop some product. In the previous post, I’ve described what we’ve decided to use for the UI and pointed out that I’m going to write integration tests. Here ...

Most of java web applications is built on top of the Spring Framework. Spring has pretty good support for testing and it is a mistake not to take advantage of features it offers. I’ve been developing various applications using Spring MVC for some time and I’ve noticed few patterns for testing that d...

While working on private stuff I’ve encountered a moment when I was in need to create a web-based user interface for the application I’ve been developing lately. In this post, I’m going to briefly describe why I’ve decided to use Node.js for generating HTML on the server side and how I’ve taken adva...

If because of reasons you have to run Maria/Postgres/Oracle on localhost for development and you often import database dumps into it you probably spend some time waiting for DB to be ready to use. In this post, I’m going to show you how you can automate the whole process and save some time doing it ...

It all started on Friday, like many of the bad things that can happen in software ;) We’ve been working for some time and after being blocked with deployments for a long time (don’t ask, you don’t want to know ;)) we were finally able to deploy a new version. Our last release was about week ago. Do ...

Imagine the situation when you’ve just released something on production and deployment went fine. You’ve just sent release notes and went out to grab a coffee. Once you are back you see an email with information that feature team have been working on for past 3 sprints doesn’t work at all. Turns out...

Recently while starting work on a project we’ve (team of two ;)) decided to try something new and use Kotlin. The project is far from ready and still under active development, but after writing some code in Kotlin I’ve got few observations I’d like to share. Read more

The story is really simple. I wanted to accept my class as rest controller method param. I decided that I don’t want to convert a simple string to object every time and it would be faster if I do the conversion in the single place. After a quick research I’ve found Converter interface which looked l...

Most of the application we are working on are built around the data. Since the information is the core value of the application we store it in the persistent and reliable storage - database. Applications evolve in time so does the way we store the data. In this post, I’m going to present my experien...

While investigating @EventListeners in spring I’ve noticed very interesting annotation - @DomainEvents. In this post I’m going to check what can be achieved using @DomainEvents annotation and how to effectively use it with old good JPA. Let’s start with short introduction to domain event idea if you...

I do like to write tests in Spock. I’m not sure if I know every feature available but until lately I felt comfortable with my knowledge. Obviously, I should not. There is always something that can catch you off guard. The question is how long will it take to figure out what’s happen. Read more

Last time I wrote about events in a spring based application I’ve introduced some basics on how events can be dispatched using spring infrastructure. In this post, I’m going to dig deeper into an order of handlers, exceptions and asynchronous events handlers. Read more

At some point in your career, you will not be happy with just a job, you’ll be looking for something which will keep you interested and will sharpen your skills. Lately, I’ve been looking for something new to do. Since I got burned last time I’ve jumped ships I decided it is the time to prepare a li...

When I’ve got some free time I try to add new features to springmock. Lately, after adding some new stuff I realized that double definition parsing class has more than one responsibility (class parsing, naming, definition creation, etc). So I’ve decided it’s time to refactor it and split responsibil...

Code review is a great process which gradually improves code quality. It is a system you can implement in many ways. In this post I’m going to grumble about one particular way of performing code reviews - when there is only one person responsible for doing code reviews and suggesting/accepting/rejec...

We all know how inheritance works and implemented some kind of class hierarchy at least few times during our career. Some of us know already that inheritance is not the silver bullet. Some of us know that inheritance must not be overused and considered with caution. Now I’m going to show you how cho...

With spring 4.2 (released more than one year ago) serious improvements regarding embedded events were made. You probably already know it, but I’ve never had a chance to properly investigate it. Lately, when digging into code base of the system I’m currently working on I got an opportunity to see it ...

I’ve been using springboot for some time now, but there was that one thing that bugged me a lot. While writing integration tests with mocks you are forced to use mockito as the mocking library. That’s great and easy to understand if you are not using spock. The problem is that in spock there are bet...

I left the company for which I’ve been working for last 4 years and now it is time to summarize my experiences. It is not the story of shady business nor confession of my sins (not all of it anyway), but rather my thoughts and experiences on working for a long time in the same company from which mos...

Some time ago I’ve been struggling with mapping hierarchical data structure in angular. Labels hierarchy was complex (like 4 levels deep with multiple parents, multiple children, basically graph like structure with some logic behind it). In the end it was/is still working but that’s the best I can s...

We all love to write new stuff and learn about things. But when we’ve got to do something in one of the older applications we’d rather avoid it and lag as long as possible hoping that someone else will handle it. You shouldn’t be afraid of legacy code (as long it is not ball of mud). You should take...