Java Weekly, Issue 218
Last updated: August 17, 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
>> Monitor and troubleshoot Java applications and services with Datadog (sponsored)
Optimize performance with end-to-end tracing and out-of-the-box support for popular Java frameworks, application servers, and databases. Try it free.
>> Brian Goetz Speaks to InfoQ on Data Classes for Java [infoq.com]
A super interesting dive into data classes – showing what challenges creators of Java need to face when designing the language.
>> How Java 10 will CHANGE the Way You Code [blog.takipi.com]
Local Variable Type Inference is another exciting upcoming feature of Java – let’s hope it won’t be abused 🙂
>> Putting Bean Validation Constraints to Guava’s Multimap [in.relation.to]
We can now apply constraints to the contents of collections. Nice.
>> How to Order Versioned File Names Semantically in Java [blog.jooq.org]
Finally, a proper Comparator implementation for comparing semantically versioned filenames.
>> How To Use Multi-release JARs To Target Multiple Java Versions [blog.codefx.org]
DevOps life made easier – multi-release JARs can contain bytecode for different Java versions and JVMs.
>> Spring Cloud Stream 2.0 – Polled Consumers [spring.io]
Spring Cloud Stream 2.0 applications can control the rate at which messages are consumed.
>> JDK 10 [openjdk.java.net]
Here’s how you can keep track of the JDKs in Java 10.
Also worth reading:
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>> Builder Pattern GoF vs Effective Java [javaspecialists.eu]
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>> Getting Started with jOOQ – Building SQL Queries in Java [thoughts-on-java.org]
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>> JDK 10: FutureTask Gets a toString() [marxsoftware.blogspot.com]
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>> Programming by contract on the JVM [blog.frankel.ch]
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>> Microservices Sidecar pattern implementation using Postgres, Spring Cloud Netflix and Docker [tech.asimio.net]
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>> Complete Cofoja Setup Example [blog.code-cop.org]
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>> How to map a JPA entity to a View or SQL query using Hibernate [vladmihalcea.com]
Webinars and presentations:
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>> Cloud-Native Journey in Synchrony Financial [infoq.com]
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>> Storage Made Easy with Spring Boot, ECS, and PCF [infoq.com]
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>> Agile: The Bad Parts [infoq.com]
Time to upgrade:
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>> Spring Boot 2.0 goes GA [spring.io]
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>> Spring Boot 2.0.0 RC2 [spring.io]
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>> Spring Integration 5.0.2 Available [spring.io]
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>> Spring Security OAuth 2.3.0.RC1 Released [spring.io]
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>> Fourteenth bug-fix release for ORM 5.2 [in.relation.to]
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>> Spring Data Kay SR5 released [spring.io]
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>> Zipkin 2.5 [github.com]
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>> Grafana v5.0 Released [grafana.com]
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>> Gradle 4.6 Release Notes [docs.gradle.org]
2. Technical
>> Tacking Restbucks with Clean Architecture, episode 1 [blog.sourced-bvba.be]
The beginning of an interesting series showcasing Clean Architecture principles by example.
Also worth reading:
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>> Agile, oven-fresh documentation. Part 1: JBake [blog.codecentric.de]
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>> Advanced Traffic-shadowing Patterns for Microservices With Istio Service Mesh [blog.christianposta.com]
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>> AxonDB, a New Implementation of an Event Store [infoq.com]
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>> Deploying PR branches with Gitlab review apps and Elastic Beanstalk [scottlogic.com]
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>> Now Available – AWS Serverless Application Repository [aws.amazon.com]
3. Musings
>> Breaking and Mending Compatibility [michaelfeathers.silvrback.com]
Sometimes it makes more sense to mess up observable behaviors of your system so that users don’t make false assumptions about the contract.
>> Tech Stack, Framework, Library or API: How Not to Specialize [daedtech.com]
Business clients often don’t care about the tools you use to solve their problems 🙂
Also worth reading:
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>> Don’t convince your coworkers to TDD [blog.schauderhaft.de]
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>> Why I quit Google [mtlynch.io]
4. Comics
And my favorite Dilberts of the week:
