Java Weekly, Issue 191
Last updated: August 10, 2021
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.
Lots of interesting writeups on Java 9 this week.
Here we go…
1. Spring and Java
>> Oracle Looking to Move Java EE to Open Source Foundation [infoq.com]
The Java EE team is considering going to an open-source, third-party foundation.
I think that’s going to be a great step forward – I hope it really works out this way 🙂
>> How Java 9 Incubator Modules Will Change the Future of Java [takipi.com]
Incubator modules will be an interesting feature of the JPMS – they will allow a safe introduction of unfinished or experimental APIs.
>> Introducing Actuator Endpoints in Spring Boot 2.0 [spring.io]
Spring Boot 2.0 brings many important (and cool) changes to Actuators, along with the support for Spring MVC, Spring WebFlux, and Jersey.
>> Vavr, Collections, and Java Stream API Collectors [4comprehension.com]
It turns out that the Stream API Collectors can be used easily with Vavr (formerly Javaslang) Collections and even with tools like Option or Try.
>> Fast Forward >> Vavr 1.0 [blog.vavr.io]
The rebranded Javaslang is approaching the first full release under the new name – which will include numerous changes like splitting the main artifact into smaller ones, and Java interoperability improvements.
>> Rise and fall of JVM languages [frankel.ch]
I always find it interesting to look at the high-level state of our ecosystem.
My one note here is that I would have liked to also see Clojure in there as well.
Also worth reading:
-
>> Guide to Spring Boot REST API Error Handling [toptal.com]
-
>> Hibernate Tips: How to map an association to a Map [thoughts-on-java.org]
-
>> The best way to implement an audit log using Hibernate Envers [vladmihalcea.com]
-
>> Cancel CompletableFuture [blog.tremblay.pro]
-
>> How to Effectively use Groovy GPath in REST Assured – Part 3: GPath XML [james-willett.com]
Webinars and presentations:
-
>> Migrating Speedment to Java 9 [infoq.com]
Time to upgrade:
-
>> Hibernate ORM 5.1.10.Final released [in.relation.to]
-
>> Hibernate Validator 6.0.2.Final released [in.relation.to]
-
>> First candidate release of Hibernate Search 5.8.0! [in.relation.to]
-
>> IntelliJ IDEA 2017.2.3 RC is Out [blog.jetbrains.com]
-
>> Spring Cloud Dalston SR3 Is Now Available [spring.io]
-
>> IntelliJ IDEA 2017.2.2: Kotlin 1.1.4, Better Performance and More [blog.jetbrains.com]
2. Technical
>> Leveraging the Power of a Database ‘Unbundled’ [confluent.io]
“Unbundling” a database makes it possible to share it between multiple services without causing an unnecessary coupling.
>> Code Smells: Deeply Nested Code [jetbrains.com]
A cool case-study of refactoring code containing multiple nested for and if statements.
Also worth reading:
-
>> Stubbing Key-Value Stores [techblog.bozho.net]
-
>> Not everything that is vital is also your core business [codecentric.de]
-
>> APIs as infrastructure: future-proofing Stripe with versioning [stripe.com]
-
>> Git: A guide to create self-reviewed merge requests [advancedweb.hu]
-
>> Sharing state between steps in Cucumber-JVM using Guice [thinkcode.se]
3. Musings
>> Perspective on Architectural Fitness of Microservices [infoq.com]
Microservices are not a recipe for a universally applicable architecture.
Like anything else – they need to be applied when there are specific problems to be solved.
>> How You’re Probably Misunderstanding TDD [daedtech.com]
There are many misconceptions about the TDD out there – here are just some of the most interesting ones.
Also worth reading:
-
>> Guard Rails, Not Prison Bars [thecodewhisperer.com]
-
>> Are Code Rules Meant to Be Broken? [daedtech.com]
4. Comics
And my favorite Dilberts of the week:
>> The urge to disagree [dilbert.com]
>> Attention span [dilbert.com]
>> Ethics [dilbert.com]
5. Pick of the Week
This week I’ve finally announced the new stuff that’s coming down the pike in my REST With Spring course – all related to Spring 5 (along with the upcoming price change):
