Java Weekly, Issue 243
Last updated: October 1, 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.
Here we go…
1. Spring and Java
>> Deep Dive into JUnit 5 Extension Model [infoq.com]
This great write-up introduces a clever extension for creating and executing BDD specification tests. Very cool.
>> How to Implement a Custom, Sequence-Based ID Generator [thoughts-on-java.org]
If you don’t want to roll-your-own database sequences, you’ll want to check out some of the cool sequence generators that you can quickly build in Hibernate by extending its SequenceStyleGenerator class.
>> X.509 client certificates with Spring Security [blog.codecentric.de]
A solid overview of the entire workflow involved in securing a Spring Boot REST service using X.509 digital certificates.
>> Bootiful GCP: Getting Started with Spring Cloud for Google Cloud Platform (1/8) [spring.io]
This quick introduction helps you build a basic Maven project for Spring Cloud GCP. Should be an interesting series!
>> Hibernate database catalog multitenancy [vladmihalcea.com]
A straightforward tutorial on configuring catal0g-based multitenancy in JPA and Hibernate — especially useful for databases that distinguish between a catalog and a schema, such as MySQL.
>> I believe in Java modules [blog.vavr.io]
A thoughtful piece reminding Java library developers of the benefits of migrating to the Java Platform Module System.
>> Hibernate with Kotlin – powered by Spring Boot [kotlinexpertise.com]
A nice, hands-on article that demonstrates how to implement JPA/Hibernate entity classes in Kotlin and use them with Spring Data repositories. Good stuff.
Also worth reading:
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>> Carefully Specify Multiple Resources in Single try-with-resources Statement [marxsoftware.blogspot.com]
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>> NetBeans Makes Progress at Apache [infoq.com]
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>> How to lazily load non-relational attributes in a portable way [thoughts-on-java.org]
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>> JBoss Web Server 5 with Tomcat 9 is Available [infoq.com]
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>> JDK 11: Release Candidate Update and OpenJDK JDK 11 LTS [marxsoftware.blogspot.com]
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>> JSON-B Asymmetrical Property Binding [blog.sebastian-daschner.com]
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>> CompletableFuture Timeouts in Java [4comprehension.com]
Webinars and presentations:
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>> Istio’s Networking API Explained [blog.sebastian-daschner.com]
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>> DSL.using(java).toGoBeyond(BeanValidation) [youtube.com]
Time to upgrade:
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>> Spring Framework 5.1 RC2 available now [spring.io]
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>> Spring Session Bean-M1 and Apple-SR4 Released [spring.io]
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>> Spring Data Lovelace RC2 available [spring.io]
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>> Spring Security 5.1.0.RC1 Released [spring.io]
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>> Spring Boot 2.1 M2 available now [spring.io]
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>> Spring Integration for AWS 2.0 GA and Spring Cloud Stream Kinesis Binder 1.0 GA [spring.io]
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>> AssertJ Core 3.11.0 release: New and noteworthy [joel-costigliola.github.io]
2. Technical and Musings
>> HTTPS security best practices [advancedweb.hu]
So, you think you know your way around HTTPS? Make sure you’re practicing safe security with this handy collection of HTTPS “dos and donts”.
>> Decoding Clojure code, getting your feet wet [blog.frankel.ch]
A short primer on some of the basic constructs and conventions of the Clojure functional language for the JVM. Sure to evoke feelings of nostalgia in former (and current) Lisp devotees.
>>Beyond Interactive: Notebook Innovation at Netflix [medium.com]
See how Netflix is taking the Jupyter Notebook infrastructure beyond its roots in data science and into general-purpose applications like workflow scheduling.
>> The Pitfalls of SIT [blog.scottlogic.com]
A reminder that system integration testing brings with it a unique set of challenges. But fear not — there are strategies to help us achieve just the right balance each step of the way.
>> Looking at randomness and performance for hash codes [vanilla-java.github.io]
As you might expect, hashing algorithms are not one-size-fits-all commodities. Find out which ones are better suited for inputs of different lengths.
>> Before You Turn On Two-Factor Authentication… [medium.com]
Even though adding 2FA is usually a good idea, it pays to know the risks involved, as well as the recovery mechanisms available, in case you get locked out of your accounts.
Also worth reading:
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>> How to Write Multiset Conditions With Oracle VARRAY Types [blog.jooq.org]
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>> Writing Big JSON Files with Jackson [techblog.bozho.net]
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>> Easy integration between services with Apache Camel [blog.codecentric.de]
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>> A Caveat with AWS Shared Resources [techblog.bozho.net]
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>> TomEE: Running with Systemd [tomitribe.com]
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>> The Must-Have Metrics Any DevOps and SRE Manager Should Measure [blog.takipi.com]
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>> An Anecdote About Trust [blog.tfnico.com]
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>> Sharing our Experience – Migrating to Agile mid-Project [blog.scottlogic.com]
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>> Chaos Engineering GameDay [blog.codecentric.de]
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>> The Curious Case of Not Hiring Directly into Software Engineer V (Or Whatever) [daedtech.com]
3. Comics
And my favorite Dilberts of the week:
