Java Weekly, Issue 290
Last updated: October 7, 2020
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:
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.
Yes, we're now running our Spring Sale. All Courses are 30% off until 31st March, 2026
In distributed systems, managing multi-step processes (e.g., validating a driver, calculating fares, notifying users) can be difficult. We need to manage state, scattered retry logic, and maintain context when services fail.
Dapr Workflows solves this via Durable Execution which includes automatic state persistence, replaying workflows after failures and built-in resilience through retries, timeouts and error handling.
In this tutorial, we'll see how to orchestrate a multi-step flow for a ride-hailing application by integrating Dapr Workflows and Spring Boot:
Yes, we're now running our Spring Sale. All Courses are 30% off until 31st March, 2026
Here we go…
1. Spring and Java
>> Java InfoQ Trends Report – July 2019 [infoq.com]
An overview of current trends in the adoptions of technologies within the Java ecosystem, according to InfoQ.
>> Evolving Java With ––enable–preview aka Preview Features [blog.codefx.org]
A beginner’s guide to enabling experimental features in early-access builds.
>> Exercises in Programming Style and the Event Bus [blog.frankel.ch]
And a quick comparison of the point-to-point Observer pattern and the publish-subscribe model of the Event Bus.
Also worth reading:
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>> Query timeout with JPA and Hibernate [vladmihalcea.com]
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>> Signs of JDK 14 Beginning to Appear [marxsoftware.com]
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>> Fallbacks Are Overrated – Architecting For Resilience [nurkiewicz.com]
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>> MicroProfile: How it has evolved and where it’s headed? [tomitribe.com]
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>> Configuring IntelliJ IDEA code style per folder [vojtechruzicka.com]
Webinars and presentations:
Time to upgrade:
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>> Spring Tools 4.3.1 released [spring.io]
2. Technical and Musing
>> Re-Architecting the Video Gatekeeper [medium.com]
A good write-up on Netflix’s use of its Hollow technology — a total high-density near cache — to eliminate I/O bottlenecks in the publishing workflow.
>> Consistency is key…But should it be? [blog.scottlogic.com]
And while consistency in a codebase is generally a good thing, it’s not a justification for repeating bad coding practices.
Also worth reading:
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>> Time travel test data in your CI/CD environment [blog.codecentric.de]
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>> Thinking out loud [blog.scottlogic.com]
3. Comics
>> Unforeseen Risks [dilbert.com]
>> Finding a Scapegoat [dilbert.com]
>> Wally Has an Idea [dilbert.com]
4. Pick of the Week
I haven’t picked a podcast in over a year, I think. And, moving past the silly name, it’s hard to find a better one to recommend:
>> The Tropical MBA Podcast [tropicalmba.com]
If you’re into podcasts, this is a good one to have in your app. If you don’t, maybe start with it.
