Java Weekly, Issue 211
Last updated: January 21, 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.
Let’s jump right in …
1. Spring and Java
>> Spring, Reactor and ElasticSearch: from callbacks to reactive streams [nurkiewicz.com]
Even if some tools don’t provide out-of-the-box support for reactive APIs, we can quickly construct these ourselves.
>> JPA Criteria API Bulk Update and Delete [vladmihalcea.com]
CriteriaUpdate and CriteriaDelete made it into the JPA specification starting with 2.1.
At this point, they’re not very well known or acknowledged; this article shows how useful they are and how to use them.
>> How to Choose the Most Efficient Data Type for To-Many Associations – Bag vs. List vs. Set [thoughts-on-java.org]
The title says it all – getting efficiency out of Hibernate is never a bad thing 🙂
>> Java Reflection, but much faster [optaplanner.org]
There are much faster alternatives to plain-old Java Reflection.
>> Facebook Open-Sources RacerD – Java Race Condition Detector [infoq.com]
An interesting tool from Facebook – for detecting race conditions in multithreaded Java code.
Also worth reading:
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>> Effective Java 3rd Edition – A Must-Read for Every Developer [thoughts-on-java.org]
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>> Continuous Validation for Security Configurations [blog.codecentric.de]
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>> Spring Cloud Service Discovery with Dynamic Metadata [blog.codecentric.de]
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>> Java 10 Checklist: Meet the Declaration That Will Change the Way You Code [blog.takipi.com]
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>> Building Microservices Awareness [thecookiezen.com]
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>> Oracle Announce New Java Champions [infoq.com]
Webinars and presentations:
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>> InfoQ’s Top Software Developer Stories, Videos and Podcasts from 2017 [infoq.com]
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>> Spring Data with John Blum [softwareengineeringdaily.com]
Time to upgrade:
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>> Visual Studio Code Announces JUnit Support [infoq.com]
2. Technical and Musings
>> A Career Guide for the Recovering Software Generalist [daedtech.com]
You can’t excel at everything (even if you do, no one will believe you), so it’s better to start specializing at some point 🙂
>> JMeter VS Gatling Tool [octoperf.com]
A comprehensive comparison of the two very popular performance testing tools.
Also worth reading:
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>> Hazelcast Joins the Eclipse Foundation [infoq.com]
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>> Starting with Ethereum – Writing a contract [blog.frankel.ch]
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>> The Resignation Counter Offer and the Danger It Presents [daedtech.com]
4. Comics
And my favorite Dilberts of the week:
