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Why Continuations are Coming to Java

Ron Pressler discusses and compares the various techniques of dealing with concurrency and IO in both pure functional (monads, affine types) and imperative programming languages (threads, continuations, monads, async/await), and shows why delimited continuations are a great fit for the imperative style.

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Java Testing Weekly 25 / 2019

There are many software development blogs out there, but many of them don’t publish testing articles on a regular basis. Also, I have noticed that some software developers don’t read blogs written by software testers. That is a shame because I think that we can learn a lot from them. That is why I decided to create a newsletter that shares the best testing articles which I found during the last week. Let’s get started. Technical Stuff Selenium – XPath Unleashed Part One provides a quick introduction to basic XPath locators which you can use when you are writing end-to-end tests with Selenium. The Really Valuable Stuff Test driven development: theory and practice is a yet another introduction to TDD. However, this blog post is actually a good one because it also talks about the pitfalls of TDD and admits that sometimes automated tests have a negative impact to the design of the implemented application. Types and Tests is a thought-provoking blog post that investigates the claim: “If you are using dynamic typing, you need to write tests for “illegal input” (wrong types, null values, and so on) because you don’t have the safety net provided by static typing”. Unit

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Java at Speed: Building a Better JVM | Software Architecture Conference | QCon New York

Getting the best performance out of your Java applications can often be a challenge due to the managed environment nature of the JVM and the non-deterministic behaviour that this introduces. This session will start by looking at what we mean by speed and how the JVM, whilst extremely powerful, means we don’t always get the performance characteristics we want. We’ll then move on to discuss the three key features of the Zing JVM that address these issues: The Falcon JIT compiler that leverages the LLVM open source project to provide optimisations specific to the newest CPU architectures using features like AVX2. ReadyNow, which allows details of speculative optimisations and JIT profiling to be logged on production systems. ReadyNow! profiles can then be used to substantially reduce the warm up and deoptimisation issues that affect performance when restarting an application. The C4 garbage collector, which eliminates GC pauses that affect the performance of an application even after all hot code paths have been compiled and optimised.

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JCP Copyright Licensing request

The open source community has welcomed Oracle’s contribution of Java EE into Eclipse Foundation, under the new name Jakarta EE. As part of this huge effort and transfer, we want to ensure that we have the necessary rights so we can evolve the specifications under the new  Jakarta EE Specification Process. For this, we need your help!