Java Web Weekly, Issue 164
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.
Lots of interesting writeups on Java 9 this week.
Here we go…
1. Spring and Java
>> Signing and verifying a standalone JAR [frankel.ch]
Signing a JAR file created by Spring Boot can be quite tricky.
>> Repackaging Exceptions In Streams [codefx.org]
Handling checked exception within lambdas can be painful. And there are no solutions for this – only workarounds.
>> RXJava2 by Example [infoq.com]
A deep dive into the basic principles of reactive programming with RxJava and loads of examples.
>> Building Multi-Release JARs with Maven [in.relation.to]
Exploring a new Java 9 feature – multi-release JAR files.
>> Integration testing strategies for Spring Boot microservices [codecentric.de]
Spring Boot and microservices solve some problems but create different challenges – testing is certainly one of them.
>> Beyond POJOs – Ten More Ways to Reduce Boilerplate with Lombok [sitepoint.com]
Most people use Lombok for POJOs or data classes but you can find other very useful uses in therenwi.
>> Creating stubs using the Hoverfly Java DSL [ontestautomation.com]
A short tutorial on stubbing APIs using Hoverfly.
>> Setting up your logging with SLF4J – How to automate the prevention of mistakes and disappearing log statements [vanwilgenburg.wordpress.com]
Properly setting up logging can actually be difficult to do well. There are a few things in here you might not have considered before.
Also worth reading:
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>> How to run integration tests at warp speed using Docker and tmpfs [vladmihalcea.com]
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>> The InfoQ eMag: Reactive Programming with Java [infoq.com]
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>> How Does the Default hashCode() Work? [sitepoint.com]
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>> Bootstrapping an OAuth2 Authorization server using UAA [java-allandsundry.com]
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>> Hibernate Tips: How to call a user-defined function in a CriteriaQuery [thoughts-on-java.org]
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>> Date and Time Formatting in Java 9 Will Get Closer to Unicode Locale Standards [infoq.com]
Webinars and presentations:
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>> Java Puzzlers NG S02: down the Rabbit Hole [infoq.com]
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>> Java SE 9: Continuing to Thrive in the Cloud! [infoq.com]
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>> Spring Tips: JOOQ [spring.io]
Time to upgrade:
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>> Spring Cloud Pipelines 1.0.0.M3 Released [spring.io]
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>> Spring Cloud Task 1.2.0.M1 is now available [spring.io]
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>> Data Geekery Releases Version 3.9.0 of jOOQ, a Java ORM Tool for Building Type Safe Queries [infoq.com]
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>> IntellIJ IDEA 2017.1 EAP: Async Smart Step Into and Faster Git File History [jetbrains.com]
2. Technical
>> FunctionAsObject [martinfowler.com]
The base of functional programming – leveraging functions as first-class citizens. A quick and worthwhile little writeup.
>> 4 Challenges to Building Multi-factor Authentication [stormpath.com]
Multi-factor authentication solutions do significantly increase the security of a system but have their own set of challenges.
>> How does a relational database work [vladmihalcea.com]
Refreshing the basics 🙂
Also worth reading:
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>> Getting Started with Oracle Container Cloud Service [couchbase.com]
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>> Crossing the Streams – Joins in Apache Kafka [codecentric.de]
3. Musings
>> Computer Science Concepts That Non-Technical People Should Know [techblog.bozho.net]
Sometimes we don’t speak the same language and we might not be aware of it. There are few concepts that would make communication between technical and non-technical people much easier.
>> Logging for Fun: Things You’d Never Thought to Log [daedtech.com]
Logging and monitoring of everyday things can give us ideas for future improvements 🙂
>> Extracting Value as an Employee [zachholman.com]
Some really pragmatic, potentially uncomfortable advice.
>> Habits that Pay Off for Programmers [daedtech.com]
The Law of Diminishing Returns applies to technical skills as well. Developing critical complementary skills – outside of pure coding – pays off in the long run.
Also worth reading:
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>> Taking the Guild Metaphor Too Far [daedtech.com]
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>> How much does ‘crunch time’ hurt team morale? [mdswanson.com]
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>> Book review: Fifty quick ideas to improve your tests [giorgiosironi.com]
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>> Amazon Rekognition Update – Estimated Age Range for Faces [amazon.com]
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>> Software ate the world [mdswanson.com]
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>> Back-to-Basic Weekend Reading: Monte-Carlo Methods [allthingsdistributed.com]
4. Comics
And my favorite Dilberts of the week:
