Java Weekly, Issue 245
Last updated: July 3, 2022
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
>> Bootiful GCP: Integration with Google Cloud Pub/Sub (4/8) [spring.io]
>> Bootiful GCP: Runtime Configuration with Spring Cloud GCP Runtime Config (5/8) [spring.io]
As this series continues, we see a simple Spring Integration messaging application in Google Cloud and a quick look at this handy API for managing runtime configuration properties on the Google Cloud Platform.
>> Default methods in Java 8, and what it changes in API design [blog.frankel.ch]
A nice write-up touts some advantages that default methods in Java interfaces have over helper classes.
>> The best way to clone or duplicate an entity with JPA and Hibernate [vladmihalcea.com]
A great approach to this common requirement of JPA applications using copy constructors. Good stuff.
>> IntelliJ IDEA 2018.2 Supports Java 11, MacBook Touch Bar and More [infoq.com]
If you’re an IntelliJ devotee, you’ll want to check out these cool new features.
>> Hibernate Tips: Validate that only 1 of 2 associations is not null [thoughts-on-java.org]
A clever way to implement a custom Bean Validation annotation using the Hibernate Validator library.
Also worth reading:
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>> JDK Language Feature Preview in Action: Switch Expressions [marxsoftware.blogspot.com]
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>> Time to look beyond Oracle’s JDK [blog.joda.org]
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>> Spock 1.2 – hassle-free Spring beans mocking in integration tests [solidsoft.wordpress.com]
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>> The State of Java Serialization [infoq.com]
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>> Implementing a Sliding Window Stream/Spliterator in Java [4comprehension.com]
Webinars and presentations:
- >> Observability with Spring-based distributed systems by Tommy Ludwig @ Spring I/O 2018 [youtube.com]
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>> What’s New in Spring Boot 2.0 by Madhura Bhave @ Spring I/O 2018 [youtube.com]
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>> Asynchronous programming with Kotlin coroutines in Spring by Konrad Kamiński @ Spring I/O 2018 [youtube.com]
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>> Continuous Deployment of Your Application by Marcin Grzejszczak @ Spring I/O 2018 [youtube.com]
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>> Fun with the Functional Web Framework by Arjen Poutsma @ Spring I/O 2018 [youtube.com]
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>> Webinar: Cloud-native patterns for Data-intensive applications [youtube.com]
- >> Building and running Spring Cloud-based microservices on AWS ECS by Joris Kuipers @ Spring I/O 2018 [youtube.com]
Time to upgrade:
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>> Spring Session for Apache Geode/Pivotal GemFire 2.0.5.RELEASE and 2.1.0.M1 Released![spring.io]
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>> Hibernate ORM 5.1.16.Final released [in.relation.to]
2. Technical
>> Widespread Architectural Change Part 1 [blog.code-cop.org]
These handy macros, scripts, and IDE commands highlight some of the many ways of applying small, across-the-board changes to a large codebase.
>> Is Test Driven Development Right for You? [blog.scottlogic.com]
If you’ve been holding out against adopting TDD, this article aims to convince you to rethink your position.
>> Combining Object Mother and Fluent Builder for the Ultimate Test Data Factory [reflectoring.io]
A great write-up on this pattern for building fully-populated test objects that you can then customize for the needs of each test. A handy tool to have in your test-writing arsenal.
>> TomEE: WebSocket and Lock it! [tomitribe.com]
A nice introduction to creating secure WebSocket endpoints using HTTP Basic Auth.
>> Engineering to Improve Marketing Effectiveness (Part 2) — Scaling Ad Creation and Management [medium.com]
An interesting piece showcases how Netflix combines ad assembly with functional quality control and machine learning to create and deliver personalized and localized ads to its huge user base.
Also worth reading:
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>> Pragmatic Programming Techniques [horicky.blogspot.com]
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>> OpenShift project backups [blog.codecentric.de]
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>> TomEE: Fat-Jar Deployments [tomitribe.com]
3. Musings
>> The Tragedy of Craftsmanship [blog.cleancoder.com]
Uncle Bob ponders how and why the Agile movement drifted from its original focus on promoting the ideals of software craftsmanship and more toward project management.
>> Should Scrum Masters Make More than Software Developers? [daedtech.com]
And an insightful review of the role that Scrum Masters play, and what the need for them says about an organization.
Also worth reading:
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>> Monte Python Simulation: Misunderstanding Monte Carlo [dannorth.net]
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>> Hazelcast Change CEO, Pledge Continued Open-Source Commitments [infoq.com]
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>> Finding your groove as they are (NOT) finding their shoes [blog.scottlogic.com]
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>> Security Researchers Find Vulnerable IoT Devices and MongoDB Databases Exposing Corporate Data [blog.shodan.io]
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>> Work Harder [blog.code-cop.org]
4. Comics
And my favorite Dilberts of the week:
>> Radical Candor [dilbert.com]
>> Wally Working in the Cloud [dilbert.com]
>> Managing by Exception [dilbert.com]
5. Pick of the Week
Last week I announced the new Spring Boot-focused material coming in REST With Spring course, along with the price change.
That price change is happening today:
