Java Weekly, Issue 283
Last updated: August 15, 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.
Distributed systems often come with complex challenges such as service-to-service communication, state management, asynchronous messaging, security, and more.
Dapr (Distributed Application Runtime) provides a set of APIs and building blocks to address these challenges, abstracting away infrastructure so we can focus on business logic.
In this tutorial, we'll focus on Dapr's pub/sub API for message brokering. Using its Spring Boot integration, we'll simplify the creation of a loosely coupled, portable, and easily testable pub/sub messaging system:
Here we go…
1. Spring and Java
>> Feature toggles in a microservice environment – Part 2: Implementation [blog.codecentric.de]
A quick look at Unleash, a Node.js service for managing feature toggles across a collection of microservices, with a simple Java-based configuration example.
>> MBD-to-MDB Messaging: Harness the Power of the River Delta [tomitribe.com]
A good write-up showing how messaging between Message-Driven Beans can lead to powerful, asynchronous architectures.
>> A boost for Java on the Client [gluonhq.com]
And Gluon announces their client plugin for Maven and Gradle, which will compile a Java app and its dependencies to native code.
Also worth reading:
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>> 5 Minutes or Less: Message-Driven Beans with ActiveMQ and TomEE [tomitribe.com]
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>> Writing Web Applications in Java – a Study of Alternatives [infoq.com]
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>> Consumer-Driven Contracts with Spring Cloud Contract [rieckpil.de]
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>> Reactive Relational Database Transactions [paluch.biz]
Webinars and presentations:
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>> A Bootiful Podcast: Twitter’s Chris Thalinger on Java, Graal, JVMs, JITs, and more [spring.io]
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>> Spring Tips: Debugging Reactor Applications [spring.io]
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>> Video course — Effective keyboard usage for developers [blog.sebastian-daschner.com]
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>> Life of a Distributed Graph Database Query [infoq.com]
- >> Massive Scale Anomaly Detection Framework [infoq.com]
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>> Quality Engineering in DevOps [infoq.com]
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>> The Future of Transportation [infoq.com]
Time to upgrade:
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>> Spring Tools 4.2.2 released [spring.io]
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>> CVE-2019-11269: Spring Security OAuth 2.3.6, 2.2.5, 2.1.5, 2.0.18 Released [spring.io]
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>> Spring Cloud Open Service Broker 3.0.1 Released [spring.io]
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>> Spring Cloud Edgware.SR6 Released [spring.io]
2. Technical and Musings
>> Using Intel Analytics Zoo to Inject AI into Customer Service Platform (Part II) [infoq.com]
An exercise in developing a Question Answering (QA) solution using Analytics Zoo on Azure’s Big Data platform.
>> Why AWS access and secret keys should not be in the codebase [advancedweb.hu]
And a few good reasons why secret keys should come from environment variables and should never be hard-coded.
Also worth reading:
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>> Microsoft Launches Several New Machine Learning Services and Extends Its Cognitive Services [infoq.com]
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>> Exercises in Programming Style, Kwisatz Haderach-style [blog.frankel.ch]
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>> Being an Ethical Software Engineer [infoq.com]
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>> Checking your clean architecture [sourced-bvba.be]
3. Comics
And my favorite Dilberts of the week:
>> If You Can Dream [dilbert.com]
>> Wally and His Priorities [dilbert.com]
>> Counting Morons [dilbert.com]
4. Pick of the Week
Last week, I wrote about Codota – a really interesting coding assistant I found and have been using.
The response to the video was overwhelmingly positive, which is always super cool to see.
Here’s Codota directly, in case you missed it. My suggestion is to simply install it and have it running in the background, as you’re coding normally:
