Java Web Weekly, Issue 128
Last updated: July 20, 2016
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.
Regression testing is an important step in the release process, to ensure that new code doesn't break the existing functionality. As the codebase evolves, we want to run these tests frequently to help catch any issues early on.
The best way to ensure these tests run frequently on an automated basis is, of course, to include them in the CI/CD pipeline. This way, the regression tests will execute automatically whenever we commit code to the repository.
In this tutorial, we'll see how to create regression tests using Selenium, and then include them in our pipeline using GitHub Actions:, to be run on the LambdaTest cloud grid:
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 I: The Reactive Landscape [spring.io]
A solid intro to the reactive programming.
And no, it’s no coincidence that this is first.
>> The Top 10 Exception Types in Production Java Applications – Based on 1B Events [takipi.com]
Another set of insights out of an interesting dataset – with the venerable NullPointerException of course at number one.
>> How To Implement equals Correctly [codefx.org]
A back-to-basics looking at equals – nicely done.
>> How to implement equals and hashCode using the entity identifier (primary key) [vladmihalcea.com]
And since we were just talking about equals, this writeup definitely fits well into that narrative with a look from the persistence side of things.
>> Observations From A History of Java Backwards Incompatibility [marxsoftware.com]
You might argue that keeping full backwards compatibility is what made Java as popular as it is today, or that it’s what keeps Java from actually moving forward well.
Either way – here’s a quick look at what it means to keep that compatibility for over 20 years.
>> Spring-Reactive samples [java-allandsundry.com]
The reactive programming model is coming to Spring, no two-ways about it. And there isn’t a whole lot of information about it out there – so this piece looks quite interesting in terms of filling that gap.
>> Netflix OSS, Spring Cloud, or Kubernetes? How About All of Them! [christianposta.com]
The Netflix ecosystem of tools is based on practical usage at scale, so it’s always super useful to go deep into understanding their tools.
Also worth reading:
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>> Reactor guides deprecated [spring.io]
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>> Java 9 Will Remove CORBA from Default Classpath [infoq.com]
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>> Introducing Spring Cloud Cloud Foundry Service Broker [spring.io]
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>> InfoQ eMag: Java Agents and Bytecode [infoq.com]
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>> Spring Boot & Apache CXF – Testing SOAP Web Services [codecentric.de]
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>> Gradle tricks – display buildscript dependencies [solidsoft.com]
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>> Hibernate Tips: How to log SQL statements and their parameters [thoughts-on-java.org]
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>> 11 JPA and Hibernate query hints every developer should know [thoughts-on-java.org]
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>> How to SpEL Validation – Class-Level & Cross-Parameter Constraints with Spring Expression Language [javatar81.com]
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>> Are @Local and @Remote EJB Interfaces Deprecated? [adam-bien.com]
Webinars and presentations:
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>> Scala, ECS, and Docker: Delayed Execution @Coursera [infoq.com]
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>> Strange Oracle Discussion, CDI vs. Singleton EJB, Remote, No Control or 27th airhacks.tv Questions and Answers [adam-bien.com]
Time to upgrade:
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>> Hibernate ORM 5.2 release [in.relation.to]
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>> Spring Releases Version 1.1 Statemachine Framework [infoq.com]
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>> Spring Cloud Stream 1.0.1.RELEASE is available [spring.io]
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>> Spring for Apache Kafka 1.0 Release Candidate 1 Available [spring.io]
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>> Spring Integration Kafka Support 2.0.0 Release Candidate is now available [spring.io]
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>> IntelliJ IDEA 2016.2 EAP Improves Log for Git and Mercurial [jetbrains.com]
2. Technical
>> Practical Event Sourcing And CQRS Benefits [sapiensworks.com]
If you’re literally just starting out, than this may be to early, but if you’ve been building systems for a while know in one form or another and haven’t explored things like DDD, Event Sourcing and CQRS – well, this is as good of time as any to.
Yes, it’s a significantly different way of building a system, but then again, really leveling up probably won’t happen from doing CRUD marginally better.
Also worth reading:
3. Musings
>> Why I switched to making products [swizec.com]
A quick and fun intro to why it’s well worth doing products. This was a fun read for me, since I made the jump into products almost one year ago today.
>> Why is Github Taking over the World? [daedtech.com]
A discussion around the history and the Why of Github.
>> Creating virtual assets in service virtualization: record and playback or behaviour modeling? [ontestautomation.com]
Definitely an interesting read exploring the two alternatives of driving the testing and explorations of a system, either by using a recorder, or programmatically. A bit high level but well worth reading.
Also worth reading:
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>> To be smart, work on problems you care about [lemire.me]
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>> Maintainable Code vs Common Code [daedtech.com]
4. Comics
And my favorite Dilberts of the week:
>> How are you doing on your unspoken objectives? [dilbert.com]
>> A monkey could do your assignment while eating a banana [dilbert.com]
>> Moving to a shared leadership model [dilbert.com]
5. Pick of the Week
>> Happiness is the Only Logical Pursuit [mrmoneymustache.com]
