Java Weekly, Issue 390
Last updated: November 28, 2022
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 and Java
>> CopyOnWriteArrayList and Collection#toArray() [javaspecialists.eu]
Deep into safe usage of the CopyOnWriteArrayList. If you haven’t been working on concurrency lately, this is a solid read.
>> What’s New in Java 16 [infoq.com]
I assume you’re not yet using Java 16 in production. A half-hour very well spent.
Also worth reading:
- >> Working with AWS DynamoDB and Spring [reflectoring.io]
- >> Quick and Seamless Release Management for Java projects with JReleaser [infoq.com]
- >> Hibernate Proxies – Why they’re used and how to unproxy them [thorben-janssen.com]
- >> Oracle JRE and JDK Cryptographic Roadmap [java.com]
Webinars and presentations:
- >> A Bootiful Podcast: Redgate technical lead for the Flyway team Mikiel Agutu on database migrations and continuous delivery [spring.io]
- >> Java 17: Features and Development – Inside Java Newscast #6 [youtube.com]
- >> Reducing test turnaround times with Quarkus 2.0 (Video) [blog.sebastian-daschner.com]
Time to upgrade:
- >> Spring Native 0.10.0 available now [spring.io]
- >> Spring Boot 2.3.12.RELEASE available now, also 2.4.7 and 2.5.1 [spring.io]
- >> Hibernate ORM 5.5.2.Final released [in.relation.to]
- >> Hibernate Search 6.0.4.Final released [in.relation.to]
2. Technical and Musings
>> Making POST and PATCH requests idempotent [mscharhag.com]
Easy to not get this right, and definitely important to – yes, idempotency is the correct way to implement these operations but also makes things so much easier long term.
>> Software Mistakes and Tradeoffs [manning.com]
Looks like a very interesting read when it’s fully out, and Tomasz shared a 35% off code with me to include in this week’s Java Weekly: nlbaeldung21. Enjoy
Also worth reading:
- >> How Syncthing provides secure file syncing without sharing your files with a third party [advancedweb.hu]
- >> Deployment of configurable Single Page Applications [blog.codecentric.de]
- >> API first – now even faster! [blog.codecentric.de]
- >> Leveling Up in the Management Skill Tree [phauer.com]
- >> 5 Rules of Coaching [lizkeogh.com]
3. Pick of the Week
This is our third and hopefully last COVID launch ever:
>> All Courses on Baeldung are 30% off – starting yesterday
