Life Beyond Java 8 (July 2020)

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https://www.jetbrains.com/lp/devecosystem-2020/java/ Despite the emergence of newer versions, Java 8 is still most beloved. It is used by 3/4 of Java developers. Java 11 is growing more popular. Compared to last year, its usage has increased by 10 percentage points.

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https://www.infoq.com/news/2020/03/new-relic-jvm-report/ https://blog.newrelic.com/technology/state-of-java/ “The majority of JVMs (over 85%) are running on Java 8”

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Releases, Updates,   Licensing & Support

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We have two types of releases

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We have two types of releases Releases and LTS (Long Term Support) releases

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$$$ $$$

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$$$ $$$

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https://flic.kr/p/8xhk74

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Use $free Oracle OpenJDK

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Java 14

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Use $free Oracle OpenJDK But upgrade every 6 months

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Use an LTS version

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Java 11

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Use an LTS version But you may have to pay to use it in production

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https://jdk.dev

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Why bother?

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Java 11

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(Current LTS release)

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JShell

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var

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Convenience Factory Methods for Collections

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Collecting to Unmodifable Collections items.stream()  .filter(Objects!::nonNull) .map(Object!::toString) .collect(Collectors.toUnmodifiableList());

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New Methods on Stream API items.stream()  .takeWhile(user !-> user.count() < maxCount)  .forEach(user !-> position.incrementAndGet()); 

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Predicate.not()

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New Methods on Optional

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Built in Http Client

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• https://blog.jetbrains.com/idea/2017/10/creating- multi-release-jar-files-in-intellij-idea/ Multi Release Jar Files

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Jigsaw

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Java Module System

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JLink

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Java 14

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(The latest version)

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(for now!!...)

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https://blog.jetbrains.com/idea/2019/02/java-12-and-intellij-idea/ Switch Expressions

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https://blog.jetbrains.com/idea/2019/11/java-13-and-intellij-idea Text Blocks (Preview)

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https://blog.jetbrains.com/idea/2020/03/java-14-and-intellij-idea/ Pattern Matching for instanceof (Preview)

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https://blog.jetbrains.com/idea/2020/03/java-14-and-intellij-idea Records (Preview)

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Java 15

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JEP 378: Text Blocks (Standard)

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JEP 375: Pattern Matching for instanceof (Second Preview)

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• Non-private constructors • Annotations • Local Types JEP 384: Records (Second Preview)

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JEP 360: Sealed Types (Preview)

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JEP 371: Hidden Classes

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JEP 377: ZGC: A Scalable Low-Latency Garbage Collector (Production)

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https://openjdk.java.net/projects/jdk/15/

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The Future

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• Project Amber • Valhalla • Loom • More Garbage Collection improvements • Proposed New Project: Leyden And in the future?

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The Business Doesn’t Care About Language Features

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Performance

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Use of Memory

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• Java 9: JEP 248: G1 the Default GC • Java 10: JEP 307: Parallel Full GC for G1 • Java 11: JEP 318: Epsilon (Experimental) • Java 11: JEP 333: ZGC (Experimental) Garbage Collection (Java 11)

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• Java 12: Shenandoah (Experimental) • Java 12: More Updates to G1 • Java 12: More Improvements to ZGC • Java 13: ZGC: Uncommit Unused Memory • Java 14: ZGC on macOS and Windows • Java 14: Deprecate the ParallelScavenge + SerialOld GC Combination Garbage Collection (Java 14)

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Cost

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Cost £$€

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Tips for Migration

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Run on updated JDK

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Run on updated JDK It might “just work”

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Address compiler warnings

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Address compiler warnings …they are there for a reason

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Update your dependencies

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Update your dependencies And add new ones

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Update your build tool

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Update your build tool Updated Maven and Gradle required

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Compile against updated JDK

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Compile against updated JDK …and start using the shiny new features

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https://www.infoq.com/articles/upgrading-java-8-to-12/

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In Summary

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Modern Java Can Help You

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Modern Java Can Help You Performance, cost, maintenance…

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There are two upgrade options

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There are two upgrade options To Java 11 (LTS) or to Java 14 (upgrade every 6 months)