Stay on top of Java news from 8 to 21

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Stay on top of Java news from 8 to 21 Thiago Bomﬁm

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Table of contents Increase Development Productivity Performance and Garbage Collector How to stay up to date with the news Frameworks and Future 01 02 03 04

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Increase Development Productivity 01

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JAVA LTS

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JEP JDK Enhancement Proposal

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String

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String

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String JEP 378: Text Blocks Java 15

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String JEP 430: String Templates (Preview) Java 21

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String

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String

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String

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String JEP 378: Text Blocks Java 15

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String JEP 430: String Templates (Preview) Java 21

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String JEP 430: String Templates (Preview) Java 21

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InstanceOf

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InstanceOf

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InstanceOf JEP 394: Pattern Matching for instanceof Java 16

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InstanceOf JEP 441: Pattern Matching for switch Java 21

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InstanceOf

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InstanceOf Polymorphism

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InstanceOf

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InstanceOf

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InstanceOf JEP 394: Pattern Matching for instanceof Java 16

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InstanceOf JEP 441: Pattern Matching for switch Java 21

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InstanceOf

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Sealed Class JEP 409: Sealed Classes Java 17

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InstanceOf JEP 441: Pattern Matching for switch Java 21

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Sealed Class JEP 409: Sealed Classes Java 17

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Sealed Class JEP 441: Pattern Matching for switch Java 21

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Records JEP 395: Records Java 16

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Can we use Record for pattern matching?

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Record Patterns JEP 440: Record Patterns Java 21

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Record Patterns JEP 440: Record Patterns Java 21

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Record Patterns

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Record Patterns

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Record Patterns

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Record Patterns JEP 358: Helpful NullPointerExceptions Java 14

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Record Patterns

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Record Patterns JEP 440: Record Patterns Java 21

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Record Patterns JEP 286: Local-Variable Type Inference Java 10

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Record Patterns JEP 443: Unnamed Patterns and Variables (Preview) Java 21

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Record Patterns

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Main

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Main JEP 445: Unnamed Classes and Instance Main Methods (Preview) Java 21

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The goal of Project Amber is to explore and incubate smaller, productivity-oriented Java language feature. Project Amber ● Pattern Matching for Switch ● Pattern Matching for Instanceof ● Unnamed Classes and Instance main methods ● Local-Variable Type Inference (var) ● Records ● Sealed Classes ● String Templates ● Text Blocks ● Switch Expressions ● Unnamed Patterns and Variables

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Performance and Garbage Collector 02

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How many GC exists? A. 2 B. 3 C. 4 D. 5 E. > 5 F. Do we have more than one?

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How many GC exists? A. 2 B. 3 C. 4 D. 5 E. > 5 F. Do we have more than one?

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Parallel GC ● Is the default until Java 9 ● Is more focused on throughput

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CMS ● Was replaced by G1GC ● It was removed by JEP 363 - Remove the Concurrent Mark Sweep (CMS) Garbage Collector, after Java 14

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G1 ● Is the default since Java 9 by JEP 248: Make G1 the Default Garbage Collector ● More focus on the balance between throughput and latency ● G1 continues to be improved, JEP 423: Region ﬁx for G1, which may be available on Java 22 ● JDK-8272773 - Conﬁgurable Card Table Card Size (-XX:GCCardSizeInBytes) available on java 18

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Epsilon ● No-Op GC ● No latency because there is no GC execution. However, there is constant memory consumption; ● JEP 318: Epsilon: A No-Op Garbage Collector (Experimental), available on Java 11 as Experimental

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Shenandoah ● Lower latency GC ● JEP 379: Shenandoah: A Low-Pause-Time Garbage Collector (Production), available on Java 15 for production

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ZGC ● Lower latency GC ● JEP 377: ZGC: A Scalable Low-Latency Garbage Collector (Production), available on Java 15 for production ● Improving in ZGC on Java 21 - JEP 439: Generational ZGC

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https://blogs.oracle.com/javamagazine/post/java-garbage-collectors-evolution

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https://kstefanj.github.io/2021/11/24/gc-progress-8-17.html

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https://kstefanj.github.io/2021/11/24/gc-progress-8-17.html

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50 VUs 50 requests per second 30 s Duration

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100 VUs 100 requests per second 30 s Duration

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400 VUs 400 requests per second 30 s Duration

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1000 VUs 1000 requests per second 30 s Duration

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Frameworks and Future 03

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Java 22 ● JEP 454: Foreign Function & Memory API ✔ ● JEP 423: Region Pinning for G1 ❓ ● JEP 447: Statements before super() (Preview) ❓ ● JEP 456: Unnamed Variables and Patterns ❓ ● JEP 461: Stream Gatherers (Preview) ❓

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Java ?? ● JEP 460: Vector API (Seventh Incubator) ● JEP 455: Primitive types in Patterns, instanceof, and switch (Preview) ● JEP 459: String Templates (Second Preview) ● JEP 404: Generational Shenandoah (Experimental) ● JEP 401: Value Classes and Objects (Preview) ….

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How to stay up to date with the news 04

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How to stay up to date? Follow the OpenJDK documentation: https://openjdk.org/projects/jdk/

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How to stay up to date? Search more JEPS: https://chriswhocodes.com/jepsearch.html

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How to stay up to date? Not all improvements are done by JEP, so you can follow the release notes from Oracle https://www.oracle.com/java/technologies/javase/21-relnote- issues.html

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How to stay up to date? Follow by blog, where I’m posting about best practices, and also news from Java 😁 https://devjava.substack.com/

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