Java Web Weekly, Issue 173
Last updated: October 23, 2021
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
>> Spring Tips: Season 2 Recap [spring.io]
A summary of the Spring Tips series, including integrations with jOOQ, Couchbase, MyBatis, and a lot more.
>> Light at the End of the Long Tunnel for Java EE 8 [infoq.com]
Looks like that waiting for Java EE 8 finally comes to an end.
>> Custom collectors in Java 8 [frankel.ch]
Java 8 comes with an overwhelming set of collectors for the Stream API but sometimes even this is not enough and you need to create your own collectors – which might be more complicated than you thought.
>> Java 9 modules – JPMS basics [joda.org]
Another solid guide to modularity in Java 9.
>> Critical Deficiencies in Jigsaw (JSR-376, Java Platform Module System) [developer.jboss.org]
Redhat team raised multiple issues regarding the current implementation of the Jigsaw Project. It looks like there were multiple compromises made when developing the new modular system for Java.
>> 8 Ways to use the features of your database with Hibernate [thoughts-on-java.org]
There are quite a few common misconceptions about Hibernate – one of which is that it can only be used for simple mapping. It turns out you can call database functions, stored procedures, map views, and quite a bit more.
>> Want to Know What’s in a GC Pause? Go Look at the GC Log! [infoq.com]
GC logs can be a source of crucial information if you know how to read it – which can be tricky because GC logging is not thread-safe (prior to Java 9).
Also worth reading:
-
>> Java Bean Validation’s validateProperty() and validateValue() in Three Minutes [sitepoint.com]
-
>> Faster Spring Boot Startup [dolszewski.com]
-
>> StringBuffer, and how hard it is to get rid of legacy code [vanilla-java.github.io]
-
>> Spring – your next Java microframework [blog.alexnesterov.com]
-
>> Deprecation of Object.finalize() [stuartmarks.com]
-
>> Javaslang Changes Name to Vavr [vavr.io]
-
>> How does a JPA Proxy work and how to unproxy it with Hibernate [vladmihalcea.com]
-
>> Use Cases for Java Enhanced Enums [marxsoftware.blogspot.com]
Webinars and presentations:
-
>> Straggler Free Data Processing in Cloud Dataflow [infoq.com]
-
>> Jean Barmarsh on Binary RPC with gRPC and Thrift, and Constraint Theory in Product Design [infoq.com]
Time to upgrade:
-
>> Spring Cloud Dalston Released [spring.io]
-
>> Spring Cloud Stream Chelsea goes GA! [spring.io]
-
>> Spring Vault 1.0 goes GA [spring.io]
-
>> Spring Data Kay M2 released [spring.io]
-
>> Spring Cloud Task 1.2.0.RC1 is now available [spring.io]
-
>> Tenth bug-fix release for ORM 5.2 [in.relation.to]
-
>> Hibernate Search now speaking Elasticsearch 5 [in.relation.to]
-
>> Spring Framework 4.3.8 released [spring.io]
-
>> Oracle JDK 9 Early Access Documentation Updated [marxsoftware.blogspot.com]
2. Technical
>> Stop sweeping your failing tests under the RUG [ontestautomation.com]
Instead of retrying your tests till they green out, it might be a better move to invest into fixing problems with the system, or with the test itself.
Also worth reading:
3. Musings
>> Elements of Helpful Code Documentation [daedtech.com]
Discovering APIs by experimenting with them is fun but not very efficient (especially from the customer side of things). By taking care of documentation, we can get a lot more productive in the long term.
>> Alternatives to Lines of Code [daedtech.com]
It’s not a secret that measuring productivity using LoC/day is less than ideal and can be hacked easily, although it still appears quite attractive to some managers.
Also worth reading:
-
>> Eliminating the Job Interview via Partnership [daedtech.com]
4. Comics
And my favorite Dilberts of the week:
