Java Weekly, Issue 249
Last updated: April 17, 2020
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:
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.
In distributed systems, managing multi-step processes (e.g., validating a driver, calculating fares, notifying users) can be difficult. We need to manage state, scattered retry logic, and maintain context when services fail.
Dapr Workflows solves this via Durable Execution which includes automatic state persistence, replaying workflows after failures and built-in resilience through retries, timeouts and error handling.
In this tutorial, we'll see how to orchestrate a multi-step flow for a ride-hailing application by integrating Dapr Workflows and Spring Boot:
Here we go…
1. Spring and Java
>> Explore the New Java 10 “var” Type: An Introduction and Hands-on Tutorial [infoq.com]
A nice write-up about type inference for local variables, a shiny new feature that aims to reduce boilerplate code.
>> The Reactive Revolution at SpringOne Platform 2018 (part 1/N) [spring.io]
A great new series begins with two cool topics — reactive SQL data access and the RSocket protocol. And a couple of solid write-ups on R2DBC and RSocket over on InfoQ.
>> Structured JUnit 5 testing [blog.codecentric.de]
A clever way to organize BDD-style tests for a class uses the @Nested annotation with inner classes to group tests that have common preconditions, and abstract superclasses for tests that exercise the same behaviors across setups. Very cool.
>> What’s new in Spring Data Lovelace? [spring.io]
The latest Spring Data release train is now GA, and it includes some powerful new features. And find out what the update means for Redis and Apache Cassandra, as well as for MongoDB.
>> Kotlin and MongoDB, a Perfect Match [blog.philipphauer.de]
A solid article presents a strong case for why Kotlin’s inherent language features make it better-suited than Java for working with MongoDB’s dynamic schemas.
>> 10 Maven Security Best Practices [snyk.io]
When it comes to protecting sensitive information in a codebase, build tool configuration is easy for novices to overlook. Be sure to check out this security cheat sheet for Maven projects.
>> Kotlin Collections API Performance Antipatterns [4comprehension.com]
It’s good to remember that Kotlin’s collections are not lazy just like Java Stream API is.
Also worth reading:
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>> A Tale of Two Oracle JDKs [marxsoftware.blogspot.com]
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>> Manual on Java 11: Does Java 11 tick all the right boxes? [jaxenter.com]
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>> Spring Framework 5.1 Ships with Java 11 Support [infoq.com]
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>> The evolution of Spring Fu [spring.io]
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>> How to bind @RequestParam to object in Spring [dolszewski.com]
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>> Tests Coverage is Dead — Long Live Mutation Testing [medium.com]
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>> Extending Swagger Codegen with new mustache template files using a new language [blog.arnoldgalovics.com]
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>> MicroProfile Fault Tolerance, Take 2 [tomitribe.com] and >> MicroProfile Fault Tolerance Annotations [tomitribe.com]
Webinars and presentations:
- Several talks from last week’s SpringOne Platform 2018 conference in Washington D.C., including Juergen Hoeller on how the new Java SE release cadence affects Spring Framework, Dave Syer on cloud abstractions, Jon Schneider on continuous delivery and Spinnaker, and Oliver Gierke & Rossen Stoyanchev on reactive data access with R2DBC.
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>> Java 11 (playlist) [youtube.com]
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>> A Microservice Approach in the Boundaries of a Traditional Enterprise Environment [infoq.com]
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>> Transport Layer Security (TLS) 1.3 [youtube.com]
Time to upgrade:
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>> Spring Batch 4.1.0.RC1 is now available [spring.io]
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>> Spring Security 5.1 goes GA [spring.io]
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>> Spring Vault 2.1 GA released [spring.io]
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>> Payara Foundation Releases Payara Server and Payara Micro 5.183 Featuring MicroProfile 2.0 Support [infoq.com]
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>> A New Era for GlassFish [infoq.com]
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>> Hibernate OGM 5.4.0.CR1 release [in.relation.to]
2. Technical
>> Modeling Uncertainty with Reactive DDD [infoq.com]
A thoughtful piece on applying Domain-Driven Design modeling techniques in reactive, distributed systems.
>> Should you learn C to “learn how the computer works”? [words.steveklabnik.com]
Or more accurately, should you “learn C to learn more about how the computer works?”
Also worth reading:
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>> How to Use SQL UPDATE .. RETURNING to Run DML More Efficiently [blog.jooq.org]
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>> Brute-forcing a seemingly simple number puzzle [nurkiewicz.com]
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>> Instrumenting Porcupine With Prometheus & Grafana [blog.sebastian-daschner.com]
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>> Learning Clojure: the arrow and doto macros [blog.frankel.ch]
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>> Yarnception: Starting Yarn Within Yarn Through Gulp and When It Is Useful [dev.to]
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>> How to securely check your LastPass vault against the Pwned Passwords database [advancedweb.hu]
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>> Android testing: AWS Device Farm vs Firebase TestLab [blog.codecentric.de]
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>> Using ZAP-proxy and nginx to debug and tamper with HTTP traffic – Emulate timeouts and other unexpected behaviour [vanwilgenburg.wordpress.com]
3. Musings
>> Rethinking Netflix’s Edge Load Balancing [medium.com]
A deep dive into how lessons learned with Zuul led to several improvements, including a reduction in errors caused by overloaded servers.
>> Narrow Niche: When is Narrow Too Narrow? [daedtech.com]
If you’re thinking about starting a blog, it pays to start off wide and narrow your focus iteratively.
Also worth reading:
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>> Models for Electronic Identification [techblog.bozho.net]
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>> What is Upstream and Downstream in Software Development? [reflectoring.io]
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>> OverOps Automated Timers And Performance Monitoring in Splunk [blog.takipi.com]
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>> Is Event Streaming the New Big Thing for Finance? [confluent.io]
4. Comics
And my favorite Dilberts of the week:
