作者彙整: Paul Krill

The fast, lightweight, open source Quarkus Java stack will graduate from its current beta designation and become available as a production release at the end of November. Sponsored by Red Hat, the microservices-oriented Java stack supports both reactive and imperative programming models. 

Quarkus is a Kubernetes-native Java stack for cloud-native and serverless application development. Quarkus promises faster startup times and lower memory consumption than traditional Java-based microservices frameworks. It features a reactive core based on Vert.x, a toolkit for building reactive applications based on the JVM, and the ability to automatically reflect code changes in running applications. 

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Google’s App Engine cloud has added official support for Java 11, the latest long-term support (LTS) version of the Java language platform, as a production release. 

The App Engine Standard Environment Java 11 runtime is generally available for running any Java 11 application, web framework, or service in a managed serverless environment. Java 11 had been offered on App Engine in a beta release since June.

The Java 11 runtime on App Engine offers twice the amount of memory as the earlier Java 8 runtime, providing better support for applications that run under a heavy workload with large amounts of data. Developers can use frameworks including Spring Boot, Ktor, Vert.x, or Micronaut.

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Google has rolled out a preview of the Android Studio 4.0 IDE, with support for the Jetpack Compose toolkit for building native Android UIs.

Android Studio 4.0 “Canary” works hand in hand with Jetpack Compose, which leverages Kotlin APIs, reduces coding requirements to build native UIs, and automatically updates a UI when state changes. Now entering a developer preview phase, Jetpack Compose is accessible in Android Studio.

Android Studio 4.0 also brings support for some Java 8 APIs, with no requirement for a minimum API level for an app. Using the desugaring process, the DEX D8 compiler in Android Studio 3.x already provided substantial support for Java 8 features such as lambda expressions. With Android Studio 4.0, the desugaring engine was extended to Java language APIs. Developers now can include standard Java language APIs available only in recent releases of Android, such as java.util.streams, in apps that support older versions of Android.

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The September 2019 update to the Visual Studio Code editor, known as version 1.39, includes a number of new capabilities and improvements for Java developers. In addition, support for Java 13, the latest version of standard Java, has been added via the Language Support for Java extension from Red Hat.

New Java features in Visual Studio Code 1.39 include easier navigation of class implementations and overriding methods, inline refactoring, and new code actions and code snippets. The Language Support for Java extension provides Java linting, IntelliSense, refactoring, and Maven and Gradle support. 

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