Java Web Weekly, Issue 141
Last updated: September 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:
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
>> The Ultimate Guide To Java 9 [codefx.org]
A monster-post all about what’s coming in Java 9.
>> Scratching a JUnit Itch [dannorth.net]
An interesting read on bringing in some concepts from Go into JUnit.
A while I haven’t used Go before, I can definitely see how the approach makes sense in a lot of scenarios.
>> How to map encrypted database columns with Hibernate’s @ColumnTransformer annotation [thoughts-on-java.org]
A code-focus explanation of how to store sensitive data in the DB by using an encrypted column.
>> Page Object pattern example [lkrnac.net]
A quick and practical intro to the Page Object pattern; this is very close to the way I now write all my end-to-end tests.
Also worth reading:
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>> Rebutting 5 Common Stream Tropes [codefx.org]
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>> Running -XX:CompileCommand on Windows [marxsoftware.com]
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>> Optional Improvements in Java 9 [iteratrlearning.com]
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>> Process API – Java 9 [oio.de]
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>> The hibernate.enable_lazy_load_no_trans Anti-Pattern [vladmihalcea.com]
Webinars and presentations:
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>> 12 Factor, or Cloud Native Apps – What Exactly Does that Mean for Spring Developers? [infoq.com]
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>> Running A Stock Java EE 7 Thin WAR On Docker [adam-bien.com]
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>> Cloud Native Security: Rotate, Repair, Repave [infoq.com]
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>> Using Clojure and Neo4j to Build a Meetup Recommendation Engine [infoq.com]
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>> Empowering DevOps with Cloud Foundry [infoq.com]
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>> Extending the Platform [infoq.com]
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>> Cloud Native Java with Spring Cloud Services [infoq.com]
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>> Applying Java 8 Idioms to Existing Code [infoq.com]
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>> In the Workshop with GCP, HomeDepot.com & Cloud Foundry [infoq.com]
Time to upgrade:
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>> Stormpath’s Java SDK 1.0 Released [infoq.com]
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>> Hibernate Validator 5.3.0.CR1 is out [in.relation.to]
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>> IntelliJ IDEA 2016.3 EAP: SF, Fira Code, Debugger Improvements and More [jetbrains.com]
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>> Spring Session 1.2.2 Released [spring.io]
2. Technical
>> Finding the link between heart rate and running pace with Spark ML – Fitting a linear regression model [vanwilgenburg.com]
A practical and cool writeup here – trying to find the relation between heart rate and pace of running.
I have a soft spot for this kind of analysis, after doing a couple of years of Mahout work and digging through similar datasets.
>> Why is troubleshooting so hard? [plumbr.eu]
We earn our troubleshooting chops on hard-mode.
That’s cool, because it turns out that – all of that stress of looking at things failing in production – makes us better engineers.
This quick writeup is a very high-level look at out options with the goal of better navigating this very nuanced and important landscape.
>> 9 Tips on ElasticSearch Configuration for High Performance [loggly.com]
Some very useful ElasticSearch practical tips from the Loggly team.
Getting some of these right can make or break your solution – as I personally learned the hard way over the last two and a half years of working with ES.
Also worth reading:
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>> New – HTTP/2 Support for Amazon CloudFront [aws.amazon.com]
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>> Amazon Aurora Update – Parallel Read Ahead, Faster Indexing, NUMA Awareness [aws.amazon.com]
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>> Function signature: how do you order parameters? [lemire.me]
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>> Infographic: IT Operations in a Serverless World [loggly.com]
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>> JUnit vs TestNG: Which Testing Framework Should You Choose? [takipi.com]
3. Musings
>> How to handle unfinished User Stories in Scrum [codecentric.de]
A good answer to a very common question if you’re doing any kind of Scrum – especially in the beginning.
>> Static Analysis for Small Business [daedtech.com]
Static Analysis is one of those tools that, once picked up by a team, won’t be abandoned any time soon. A small team is no different, and this quick writeup explores why it does make sense here as well.
>> Are there too many people? [lemire.me]
I realize this is just scratching the surface and understanding how populations shrink and grow is a deep topic.
That being said, this was a good primer.
>> The Billing Maturity Model [daedtech.com]
If you’re doing consulting, this piece is going to help you out, if only to give you the context to step away from hourly billing.
And if you’re on this path, have a look at the “Hourly Billing is Nuts” book as well.
Also worth reading:
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>> How to make difficult decisions [successfulsoftware.net]
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>> Limits of the technical debt analogy [frankel.ch]
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>> The Lurn [cleancoder.com]
4. Comics
And my favorite Dilberts of the week:
