Java Web Weekly, Issue 129
Last updated: February 10, 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:
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:
At the very beginning of last year, I decided to track my reading habits and share the best stuff here, on Baeldung. Haven’t missed a review since.
Here we go…
1. Spring and Java
>> Notes on Reactive Programming Part II: Writing Some Code [spring.io]
A reactive system is an entirely different beast, and such a good fit for a small set of scenarios.
A great writeup to go through if you want to skate where the puck is going.
>> Java EE 8 in Crisis [xenonique.co.uk]
And since we’re talking about where we’re headed, the state and outlook of Java EE 8 is significant for the entire Java community and ecosystem.
>> How to implement a custom String-based sequence identifier generator with Hibernate [vladmihalcea.com]
A super practical, focused solution on generating String ids with Hibernate (which is actually something I wandered about in the past).
And, as always, Vlad’s picking his topics with the help and involvement of the community, which is a really a solid way to go about things. A cool resource.
>> How To Implement hashCode Correctly [codefx.org]
The next back-to-basics writeup after we had a look at equals last week. I knew this one was coming.
>> Configure Once, Run Everywhere: Decoupling Configuration and Runtime [infoq.com]
Real-world project configuration is never as easy as we might initially think.
Now – I’m not sure if a standard is the answer here, but the practical approach here looks interesting.
>> It’s Time to Unlearn Everything You Know About Java Exceptions [takipi.com]
A high level piece about how to actually do exceptions well. It also reads well, I think Alex had some fun writing this one.
>> Should you use JPA for your next project? [thoughts-on-java.org]
Hibernate and JPA are certainly not a good fit for every type of project out there, but they’re a solid base for a lot of them. And if you really get to know the tool well, it can be surprising how far you can go.
This interactive writeup can be helpful in making the decision when you’re starting up a new project, or at least give you some context around that decision.
>> JDK 9 is not (yet) Feature Complete — how will we get there? [mail.openjdk.java.net]
Yeah.
Also worth reading:
-
>> Anti-If: The missing patterns [code.joejag.com]
-
>> @Stateful vs. @SessionScoped [adam-bien.com]
-
>> Carving the Java EE Monolith Into Microservices: Prefer Verticals Not Layers [christianposta.com]
-
>> Migrating from Desktop to Cloud-Native Web Applications [oracle.com]
-
>> How to intercept JDBC PreparedStatement calls with Hibernate [in.relation.to]
-
>> Benchmarking Java Logging Frameworks [dzone.com]
-
>> Gluon Announces Full Java 9 Mobile Initiative [infoq.com]
-
>> Oracle Code QA [code-cop.org]
-
>> The Roadmap to Kotlin 1.1 [infoq.com]
Webinars and presentations:
-
>> Adventures in 3D with Eclipse ICE and JavaFX [infoq.com]
Time to upgrade:
-
>> Spring Framework 4.3 goes GA [spring.io]
-
>> Spring Integration 4.3 GA is Available [spring.io]
-
>> Spring Cloud Stream 1.0.2.RELEASE is available [spring.io]
-
>> Spring Cloud Brixton.RELEASE Reaches General Availability [infoq.com]
-
>> Spring Cloud Brixton.SR1 is available [spring.io]
-
>> Spring Data release train Hopper SR2 released [spring.io]
-
>> Headlands Firehose Edition Is Available [adam-bien.com]
2. Technical
>> Mutation Testing [cleancoder.com]
A good intro to mutation testing and also to a library that might be interesting to explore – pitest.
>> Serverless Architectures [martinfowler.com]
>> Serverless Reference Architectures with AWS Lambda [allthingsdistributed.com]
I don’t know much about this architectural style, and these writeups were a good way to get started.
Also worth reading:
-
>> Styles of unit testing [enterprisecraftsmanship.com]
-
>> Writing OpenAPI (Swagger) Specification Tutorial – Part 7 – Documentation [apihandyman.io]
3. Musings
>> Creating Your Code Review Checklist [daedtech.com]
Some good aspects to think about on your next code review.
>> Three Martini Open Office Plans [daedtech.com]
A fun exploration of whether or not open office plans make sense, from the POV of an outsider.
For me personally it’s been long enough since I last had the experience of trying to get work done in an open office, so I can half-laugh about it. But I very distinctly remember it wasn’t easy to pull off.
Also worth reading:
-
>> Closing shop [dandreamsofcoding.com] and >> Ownership [dandreamsofcoding.com]
-
>> The strange case of the copyright of open-source software [lemire.me]
-
>> Dealing with Legacy Code for Developers: Managing your Manager [daedtech.com]
-
>> Open sourcing my workshop: an experiment [ontestautomation.com]
4. Comics
And my favorite Dilberts of the week:
