Java Weekly, Issue 188
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.
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:
Lots of interesting writeups on Java 9 this week.
Here we go…
1. Spring and Java
>> Spring Framework 5 Kotlin APIs, the functional way [spring.io]
The new Spring 5 will not only be compatible with Kotlin but actually, treat the language as a first-class citizen – which is very cool.
>> Java 9 Migration Guide: The Seven Most Common Challenges [blog.codefx.org]
The introduction of JPMS solves some problems but brings its own set of challenges. Let’s have a look at some of these.
>> Reactive Spring 5 and application design impact [spring.io]
Spring 5 definitely takes a step towards the reactive and functional approaches to building an application.
>> Loads of Small Improvements in IntelliJ IDEA 2017.2 [blog.jetbrains.com]
The newest version of IntelliJ IDEA comes with a bunch of very interesting small features.
>> Eager subscription – RxJava FAQ [nurkiewicz.com]
RxJava has some corner cases not to be ignored – this writeup deals with an on-demand eager evaluation of Flowables.
>> Write for Baeldung [www.baeldung.com]
Last but certainly not list, if you’d like to contribute – I’m currently looking for two new authors for the site. Get in touch if you’d like to know how that works.
Also worth reading:
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>> How to optimize the merge operation using update while batching with JPA and Hibernate [vladmihalcea.com]
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>> Database Tools: What’s New in IntelliJ IDEA 2017.2 [blog.jetbrains.com]
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>> Java Command-Line Interfaces (Part 9): parse-cmd [marxsoftware.blogspot.com]
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>> Kotlintest and property based testing [java-allandsundry.com]
Webinars and presentations:
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>> Java Futures: Modules and More [infoq.com]
Time to upgrade:
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>> Spring Security OAuth 2.2 Released [spring.io]
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>> Spring Boot 1.5.6 available now [spring.io]
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>> Spring Boot 2.0.0.M3 available now [spring.io]
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>> Spring Vault 1.1.0 M1 and 2.0.0 M2 available [spring.io]
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>> Spring Cloud Data Flow 1.2.3 Released [spring.io]
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>> GRAILS 3.3 GA RELEASED [grailsblog.objectcomputing.com]
2. Technical
>> A Dockerfile for Maven-based Github projects [blog.frankel.ch]
Docker good practices are always welcome.
>> The Top 5 Disadvantages of Not Implementing an Exception Inbox Zero Policy [blog.takipi.com]
Another interesting approach to dealing with exceptions.
We, as an industry, haven’t been doing a particularly good job working with errors and exceptions, so there’s certainly room for improvement here.
Also worth reading:
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>> OIDC in Action – An OpenID Connect Primer, Part 2 of 3 [developer.okta.com]
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>> What’s in a Token? – An OpenID Connect Primer, Part 3 of 3 [developer.okta.com]
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>> Version-Based Database Migration with Liquibase – Update an Existing Database [thoughts-on-java.org]
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>> Domain Models – Late Evaluation buys you better Composition [debasishg.blogspot.com]
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>> IntelliJ IDEA 2017.2.1: Better Performance and Spring Run Dashboard [blog.jetbrains.com]
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>> Database design using Anchor Modeling [blog.codecentric.de]
3. Musings
>> Concerns about the Blockchain Technology [techblog.bozho.net]
Blockchain technologies are getting more and more popular, but there are some challenges that will need to be faced, as the recent problems made it abundantly clear.
>> From Employable Generalist to Successful Efficiencer [daedtech.com]
An interesting case study of transitioning from a full-time employee to a one-man consulting company.
Also worth reading:
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>> The Brain Problem [blog.cleancoder.com]
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>> Eclipse Projects: Level Playing Field [waynebeaton.wordpress.com]
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>> How I continuously hone my skills and why you should too [ontestautomation.com]
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>> The Unnecessary Tool [satisfice.com]
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>> What DevOps Means for Static Analysis [daedtech.com]
4. Comics
And my favorite Dilberts of the week:
