The Baeldung Weekly Review 18
Last updated: June 30, 2017
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
Refactor Java code safely — and automatically — with OpenRewrite.
Refactoring big codebases by hand is slow, risky, and easy to put off. That’s where OpenRewrite comes in. The open-source framework for large-scale, automated code transformations helps teams modernize safely and consistently.
Each month, the creators and maintainers of OpenRewrite at Moderne run live, hands-on training sessions — one for newcomers and one for experienced users. You’ll see how recipes work, how to apply them across projects, and how to modernize code with confidence.
Join the next session, bring your questions, and learn how to automate the kind of work that usually eats your sprint time.
Regression testing is an important step in the release process, to ensure that new code doesn't break the existing functionality. As the codebase evolves, we want to run these tests frequently to help catch any issues early on.
The best way to ensure these tests run frequently on an automated basis is, of course, to include them in the CI/CD pipeline. This way, the regression tests will execute automatically whenever we commit code to the repository.
In this tutorial, we'll see how to create regression tests using Selenium, and then include them in our pipeline using GitHub Actions:, to be run on the LambdaTest cloud grid:
1. Spring
>> Preview Spring Security Test: Method Security
Spring Security 4.0 being announced makes me very excited. This first look goes into how to test secured methods – looks very clean – and the new @WithMockUser is going to be especially handy.
>> Writing Clean Tests – It Starts from the Configuration
A nuanced discussion on building out a test suite in Spring, while keeping the DRY principle in mind. If you’re working with Spring (and chances are – if you’re reading my blog – you are) – this is well worth reading.
>> Tracking Exceptions – Part 6 – Building an Executable Jar
Latest and perhaps final installment of a series I’ve been covering on the Baeldung weekly review ever since it started – building an Spring application that is going to analyze and report on logging data. This is about packaging the app.
>> Spring HATEOAS – 0.11.0 Release
Spring HATEOAS is – in my view – one of the most interesting new projects in the Spring ecosystem. It is so very cool that Spring is looking at this as a first class citizen and moving it forward – check out the new Traverson API for a high level fluent API for discovering a Hypermedia service.
>> Spring Scala based sample bean configuration
While I’m not personally doing work in Scala (I lean towards Clojure when it comes to JVM languages) – I found it interesting to see just how flexible Spring configuration has become.
2. Java
>> @OneToOne with shared primary key, revisited
A solution for a one-to-one relation with JPA 2.0. Short, useful and to the point.
>> Three-State Booleans in Java
A custom implementation of a ResultSet iterator necessary for working with the new Java 8 streams syntax. The solution is – like any other design decision – a compromise; however, understanding both sides of a compromise is usually where learning happens (at least for me) – which makes this a very nice read indeed.
3. Technology
>> UnitTest
Martin Fowler on Unit Testing. What else do you really need to know?
>> If You Can Read This, You’re SNIing
A very interesting little read about requiring SNI information or hard-failing if it’s not present. Very cool step to take, especially considering that we have ran out of IPv4 addresses last year.
4. Musings
>> Encapsulation vs Inversion of Control
One of the every once in a while posts that made me reconsider some stuff I was taking as a given. I like that.
>> Test Driven Discipline
Doing TDD is without a doubt a transformative practice for a developer. Realistically – it is also hard to stick with it.
It took me around 2 years of giving it the ol’ college try a few times until I really took the step of integrating it into my day to day. And there are still project where – for some reason or another – I don’t do it.
This article is a pragmatic view on what it means to do TDD.
