Tag Archives: java

Preparing for Java Virtual Threads

It was recently announced that virtual threads, a new JDK feature developed by the OpenJDK project Loom, will be available as a preview feature in the forthcoming Java 19 release.

One of the design goals of this new feature is to enable existing multi-threaded Java apps to adopt virtual threads with little or no change. This has to all intents and purposes been achieved in a couple of  ways. Firstly, virtual threads are able to run any existing Java code or native code – there are no restrictions in that respect. Secondly, there are no breaking changes to the existing Thread API, or associated language constructs such as synchronized blocks, should your code use these lower level thread management APIs. However, attaining the full benefits of virtual threads requires Java developers to make a few changes to the way they have solved certain problems in the past. This is euphemistically described by the Loom team as needing to ‘unlearn’ certain coding practices and ways of doing things. This article outlines these cases, highlighting how you can prepare your existing applications to maximise the benefits of virtual threads when they are finalised in a future release of Java; and more generally considers how the introduction of virtual threads may change the way we develop multithreaded Java apps in the future.

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Java 17 is here and set for mass adoption

Java 17 was recently publicly released by Oracle on schedule (Sept 2021). This is a significant and highly anticipated new release for Java engineering teams around the world, for several reasons. I predict it will see mass adoption and become the dominant version of Java used by enterprises over the next couple of years. Read on to find out more, including learning about the major new language features in Java 17 that engineering teams can benefit from, including code examples.

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Java 15 is Generally Available (GA) – What’s New?

Java 15 became GA earlier this month (Sept 2020) (as announced by Oracle). As per Oracle’s now regular time-based schedule for major new releases of Java, this release was expected and comes 6 months after the previous one (Java 14 in March 2020). In this post I outline what I personally consider to be the most significant new features in Java 15 from a developer’s perspective, focusing primarily on the new Java language. I’ve also included some of the changes to the JDK core libraries / APIs and the JVM which will be of interest to developers.

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Evaluating Solutions for Serverless Spring Microservices – Part 1

Deploying and running services on Function-as-a-Service (FaaS) compute platforms like AWS Lambda has some compelling benefits for appropriate use-cases (short running workloads), including true (low-latency) elastic scalability, at finer granularity, with significant cost-savings based on scaling to zero.

At  the same time,  the Spring application framework (and more recently Spring Boot) has long  encouraged and helped accelerate building modern, flexible enterprise apps that run on the  JVM, that are easy to test, by abstracting away generic code (‘plumbing’) for integrating an app with its libraries and APIs; using familiar design/programming patterns (IoC/DI, proxies, Template methods etc); and providing valuable features (declarative transaction management, environment specific config, etc).

In an ideal world we’d use all these technologies – building Java/JVM functions with the help of Spring that are deployed and run on AWS Lambda – to realise their combined benefits.

But can these technologies be made to work together effectively? Or do we need to accept that when it  comes to designing and building services to  run on FaaS platforms like AWS Lambda, tech stacks (programming languages and application framework) offer than Java and Spring may offer a better solution?

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Java 12 – New Features and Adoption Considerations

Java 12,  or more accurately the Java Development Kit (JDK) 12) was officially released by Oracle on the 19th March 2019. This blog post highlights the subset of new features in this next major release of Java that will be of most interest to enterprise Java developers, in terms of the Java language, the core library APIs and other JDK features. It also outlines the support & maintenance available for this new release, and how this might influence your decision on whether to adopt it in production.

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Java 11 – New Features, Code Examples & Support

Java 11Java 11 was officially released by Oracle on 25th Sept 2018. This blog post highlights the subset of features in this next major release of Java that will be of most interest to enterprise Java developers. These include  a small number of new language features, for which I have also provided some code examples showcasing how they can be used. This post also outlines the significance of this new Java release from a support & maintenance perspective; upgrade considerations; and includes a reminder about the recent change in the licensing terms for the Oracle JDK.

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Oracle’s Recent Changes to Java (JDK) – Overview, Impact & Advice

Oracle have recently made several changes concerning how they maintain, support  & license  use of Java (more accurately the JDK).  This has commercial & technical implications for all enterprises running apps on the JVM (users of the JDK)  in production – regardless of the app programming language (Java, Groovy, Kotlin, etc).

Don’t panic! Java is still free. But anyone responsible for developing or provisioning JVM apps for production usage needs to be aware  of these changes and consider how it impacts their teams and business.

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Java 10 – New Features, Code Examples & Support

Java 10 logo

Java (or more accurately JDK) 10 was officially released on 20th March 2018. It includes a total of 12 new features, a full list of which can be found on the OpenJDK project page for JDK 10 , including links to their relevant JDK Enhancement Proposal (JEP) describing each in more detail. This blog post highlights the subset of features that will be of most interest to enterprise Java developers. These include a small number of new Java language features, for which I have also provided some code examples showing how they can be used.

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Java 9 – Features, examples & upgrade planning

Java Standard Edition (JSE) 9 (‘Java 9’) was finally completed and publicly released at the end of Sept 2017. This post contains a brief overview of what’s new in Java 9, and outlines the main reasons why you or your business might consider upgrading, if at all. It also provides developers with a link to a set of code examples that I’ve produced, which showcase the major new language features in Java 9 and explains each of them in more detail.

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Designing and building an open source REST API client

I’ve recently designed and built an open source API client for the REST API of a major enterprise video and webcast service, for use by its customers. It was a rewarding exercise that has helped me gain some valuable additional practical experience of emerging technology and tools for building and testing apps. This post outlines the value of the API client, its design, the technologies and tools I used, and how I rate them. I’ve open sourced the code to allow customers, and others, to view and reuse what I’ve built.

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