Java Weekly, Issue 367
Last updated: January 8, 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:
1. Spring and Java
>> AdoptOpenJDK Welcomes Dragonwell [infoq.com]
Dragonwell joins AdoptOpenJDK – an OpenJDK distribution supporting coroutines and pre-warmup!
>> Pattern Matching for Arrays and Varargs [mail.openjdk.java.net]
Another enhancement from Amber – supporting pattern matching for Arrays and Varargs!
>> Investigating MD5 overheads [cl4es.github.io]
Investigating a possible performance improvement: analysis, profiling, compiler optimizations, and much more!
Also worth reading:
- >> Hibernate LazyToOne annotation [vladmihalcea.com]
- >> Java Proxies: From Dog to TransactionalDog [mitchellbosecke.com]
- >> MongoDB Testcontainers Setup for @DataMongoTest [rieckpil.de]
- >> The state of JVM desktop frameworks: introduction [blog.frankel.ch]
- >> YMNNALFT: Easy Docker Image Creation with the Spring Boot Maven Plugin and Buildpacks [spring.io]
- >> Content-Security-Policy Nonce with Spring Security [techblog.bozho.net]
Webinars and presentations:
Time to upgrade:
- >> Hibernate Search 5.11.8.Final released [in.relation.to]
- >> Spring Cloud Contract 3.0.0 released [toomuchcoding.com]
- >> Spring Cloud Sleuth 3.0.0 released [toomuchcoding.com]
- >> Apache Netbeans 12.2 Supports Java 14 and 15 [infoq.com]
2. Technical
>> Consistent Core [martinfowler.com]
Patterns of distributed systems: leader election, membership information, and metadata management using consistent core!
Also worth reading:
- >> Getting Started with AWS CloudFormation [reflectoring.io]
- >> Airbnb Showkase: a Browser for Your JetPack Compose Library [infoq.com]
3. Musings
>> Maximizing Developer Effectiveness [martinfowler.com]
Embracing micro-feedback loops to achieve a more effective developer experience.
Also worth reading:
- >> Selected podcasts from 2020 [blog.mitemitreski.com]
- >> Minecraft Terminology for Java Developers [info.michael-simons.eu]
4. Comics
And my favorite Dilberts of the week:
>> Increasing Training Budget [dilbert.com]
>> Audit Blackmail [dilbert.com]
5. Pick of the Week
>> The Builder’s High [randsinrepose.com]
