Java Weekly, Issue 293
Last updated: August 9, 2019
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.
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
>> Brian Goetz Speaks to InfoQ about Proposed Hyphenated Keywords in Java [infoq.com]
As Java continues to evolve, we may soon see hyphenated keywords, like the recently proposed (but later dropped) break-with.
>> 5 minutes or less: Jakarta JSON Binding with Apache Johnzon [tomitribe.com]
And a quick overview of JSON-B, yet another JSON binding layer for Java.
>> How to write JPA Criteria API queries using Codota (video) [vladmihalcea.com]
It’s cool to see Codota popping up in other writings I follow. The IDE plugin for IntelliJ and Eclipse takes some of the pain out of writing JPA criteria queries.
Also worth reading:
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>> Pagination best practices [vladmihalcea.com]
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>> JDBC – Emulating a sequence [vard-lokkur.com]
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>> Write Java EE applications with Kotlin [rieckpil.de]
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>> Pragmatism applied: Avoid single implementation interface [blog.tremblay.pro]
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>> Project Valhalla Eclairs [marxsoftware.com]
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>> Microservices Metrics targets with Eclipse MicroProfile [tomitribe.com]
Webinars and presentations:
Time to upgrade:
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>> Spring Framework 5.1.9, 5.0.15 and 4.3.25 available now [spring.io] and >> Spring Framework 5.2 goes RC1 [spring.io]
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>> Spring Boot 2.1.7 available now [spring.io] and >> It is time – Goodbye Spring Boot 1.x! [spring.io]
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>> Spring Security 5.1.6 and 5.0.13 Released [spring.io] and >> Spring Security 5.2.0.M4 Released [spring.io]
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>> Spring Data Moore RC2, Lovelace SR10, and Ingalls SR23 released [spring.io]
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>> Spring Boot for Apache Geode & Pivotal GemFire 1.1.0.RC1 Released! [spring.io]
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>> Spring Cloud Data Flow 2.2.0 Released [spring.io]
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>> Spring Session Corn-M3 and Bean-SR7 Released [spring.io]
2. Technical and Musing
>> Hands-On Spark Intro: Cross Join Customers and Products with Business Logic [blog.codecentric.de]
Lessons learned implementing large cross joins in a Spark application.
>> Those Who Can’t, Sell Tutorials on How You Can [daedtech.com]
Before buying into someone else’s blueprint for success, it’s good to remember that context is still king. What worked for them may not be the complete and tidy solution you’re looking for.
Also worth reading:
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>> Serverless plugins – Automatic generation of monitoring dashboards [blog.codecentric.de]
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>> Exercises in Programming Style: FP & I/O [blog.frankel.ch]
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>> Expanding the cloud to the Middle East: Introducing the AWS Middle East (Bahrain) Region [allthingsdistributed.com]
