Beyond Java 8 - Speaker Deck

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Upgrading Past Java 9 Sounds Scary …and I don’t want to pay for Java

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Super happy with Java 8, thanks

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Starting with Java 11, Oracle will provide JDK releases under the open source GNU General Public License v2, with the Classpath Exception (GPLv2+CPE), and under a commercial license for those using the Oracle JDK as part of an Oracle product or service, or who do not wish to use open source software. This… replaces the historical “BCL” license, which had a combination of free and paid commercial terms. Donald Smith, Sr. Director of Product Management (June 2018) https://blogs.oracle.com/java-platform-group/oracle-jdk-releases- for-java-11-and-later

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That sounds frightening, and overly complicated. Talk us through it. The Lego Batman Movie

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That sounds frightening, and overly complicated. Talk us through it. The Lego Batman Movie

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

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From Java 11 forward, Oracle JDK builds and OpenJDK builds will be essentially identical. Donald Smith, Sr. Director of Product Management (Sept 2018) https://blogs.oracle.com/java-platform-group/oracle-jdk-releases- for-java-11-and-later

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https://blog.joda.org/2018/09/time-to-look-beyond-oracles-jdk.html

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https://adoptopenjdk.net

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https://adoptopenjdk.net/support.html

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Language features

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JShell

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JShell

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JShell

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var

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var

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var

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var

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var

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var

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Convenience Factory Methods for Collections

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Convenience Factory Methods for Collections

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Convenience Factory Methods for Collections

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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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Http Client @tddmonkey

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Multi Release Jar Files

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Jigsaw

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Java Module System

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Java Module System

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JLink

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And in the future?

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Java 12: Switch expressions

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• JEP 302: Lambda Leftovers (including underscore for param) • JEP 305: Pattern Matching (Preview) • Data Classes for Java • Project Amber • Valhalla • Loom And in the future?

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Performance

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Memory Usage

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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 Collectors

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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) • Java 12: JEP 189: Shenandoah (Experimental) • Java 12: More Updates to G1 • Java 12: More Improvements to ZGC Garbage Collectors

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Cost £$€

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Catch the 6 month release train

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If It Hurts, Do It More Frequently, and Bring the Pain Forward An idea from Extreme Programming (XP) Continuous Delivery – Jez Humble & Dave Farley

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Modularity?

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Missing classes / methods

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Run on updated JDK It might “just work”

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Address compiler warnings …they are there for a reason

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Update your dependencies And add new ones

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Update your build tool Maven and Gradle work with Java 12

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

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Java Is Changing …fast

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Modern Java Can Help You Performance, cost, maintenance…

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Upgrade Now And Reduce Future Pain …and keep upgrading, at least in CI

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