Upgrade to Pro — share decks privately, control downloads, hide ads and more …
Sign up for free

Java-Scala interoperability - April 2016

Sponsored · SiteGround - Reliable hosting with speed, security, and support you can count on. →
Avatar for sullis sullis
April 19, 2016
Programming
390
0

Java-Scala interoperability - April 2016

Java-Scala interoperability
Portland Java User Group
April 19, 2016

Avatar for sullis

sullis

April 19, 2016

More Decks by sullis

See All by sullis
Dependency Management for Java - Code Remix Summit 2026-05-12
Avatar for sullis sullis
0
86
AI Assisted Software Development - Portland Java User Group - 2026-04-14
Avatar for sullis sullis
0
94
Dependency Management for Java - Seattle 2025-11-18
Avatar for sullis sullis
0
64
Dependency Management for Java - Portland - 2025-11-04
Avatar for sullis sullis
0
45
Dependency management for Java applications 2025-09-11
Avatar for sullis sullis
0
63
S3 NYC Iceberg meetup 2025-07-10
Avatar for sullis sullis
0
66
Amazon S3 Chicago 2025-06-04
Avatar for sullis sullis
0
160
Amazon S3 Boston 2025-05-07
Avatar for sullis sullis
0
120
Netty ConFoo Montreal 2025-02-27
Avatar for sullis sullis
0
190

Other Decks in Programming

See All in Programming
標準パッケージに uuid が追加された 背景から見る Go らしい意思決定 / go_127_uuid_decision
Avatar for convto convto
4
3.2k
Press start. Python's next generation.
Avatar for Carol Willing willingc
PRO
3
320
異なる設計思想のフレームワークを経験して得た学び
Avatar for amekuhideki amekuhideki
2
1.5k
MIZARU@SPAJAM2026 第二回予選
Avatar for drama 1901drama
0
110
PyO3 で既存 Python 評価器を Rust core 化する ー wasm-bindgen でブラウザにも配るための設計
Avatar for 𝕂' kdash
1
560
Oxlintはいいぞ（続）
Avatar for Yuji Yamaguchi yug1224
1
560
AI Agent時代のリアーキテクチャ戦略と実践
Avatar for Kazuhito Hokamura hokaccha
2
1.1k
Claude Codeを組織的に動かして月400PRを実現した話
Avatar for happy_ryo happy_ryo
0
260
Swift愛好会と私（ウホーイ） / Swift Fan Club and Uhooi
Avatar for uhooi uhooi
0
140
LLMは4年分のCompose移行を再現できるのか？実プロダクト279件のXMLで探る自動化の境界線
Avatar for makun makun
0
440
DynamoDBの基礎を振り返りながらベクトル検索機能を理解する
Avatar for 村上優稀 musan
3
270
AIに既存システムを理解させる技術　～レガシーを見捨てないハーネスエンジニアリング入門～
Avatar for Ochtum ochtum
0
210

Featured

See All Featured
Why Our Code Smells
Avatar for Brandon Keepers bkeepers
PRO
340
58k
CSS Pre-Processors: Stylus, Less & Sass
Avatar for Bermon Painter bermonpainter
360
30k
The Anti-SEO Checklist Checklist. Pubcon Cyber Week
Avatar for Ryan Jones ryanjones
0
230
What Being in a Rock Band Can Teach Us About Real World SEO
Avatar for Ade Holder 427marketing
0
1.1k
Designing for Performance
Avatar for Lara Hogan lara
611
70k
Navigating Algorithm Shifts & AI Overviews - #SMXNext
Avatar for Aleyda Solis aleyda
1
1.6k
Unsuck your backbone
Avatar for Amy Palamountain ammeep
672
58k
The Cult of Friendly URLs
Avatar for Andy Hume andyhume
79
7k
Joys of Absence: A Defence of Solitary Play
Avatar for Sebastian Deterding codingconduct
1
490
How People are Using Generative and Agentic AI to Supercharge Their Products, Projects, Services and Value Streams Today
Avatar for Helen Beal helenjbeal
1
310
Designing Dashboards & Data Visualisations in Web Apps
Avatar for Des Traynor destraynor
232
55k
Context Engineering - Making Every Token Count
Avatar for Addy Osmani addyosmani
9
1.1k

Transcript

  1. Java-Scala interoperability Sean Sullivan April 19, 2016 Portland Java User

    Group

  2. • software engineer • 20 years Java • 5 years

    at Gilt • back office systems @ Gilt About me

  3. • Scala @ Gilt.com • Scala on the Java VM

    • code examples Agenda

  4. www.gilt.com

  5. https://www.gilt.com/checkout

  6. None

  7. “The Scala 2.11.x series targets Java 6" http://www.scala-lang.org/news/2.11.0/

  8. http://scala-lang.org/news/2.12-roadmap/ “The official Scala 2.12 distribution will be built for

    Java 8 (and thus require it)”

  9. Scala case classes and JSP’s

  10. case class Thing( name: String, color: String)

  11. thing.jsp <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <html> <body> <c:out value=“${myThing.name}”/>

    </body> </html>

  12. JSP expression language expects a JavaBean with “getter” methods

  13. import scala.reflect.BeanProperty case class Thing( @BeanProperty name: String, @BeanProperty color:

    String) @BeanProperty annotation

  14. Collections

  15. None

  16. • convert java.util.List to Scala collection • convert java.util.Set to

    Scala collection • convert java.util.Map to Scala collection • convert Scala List to java.util.List Common scenarios

  17. import scala.collection.JavaConverters._

  18. import java.util.{ArrayList => JArrayList}
 import scala.collection.JavaConverters._
 
 val jArrayList =

    new JArrayList[String]
 jArrayList.add("a")
 jArrayList.add("b")
 jArrayList.add("c")
 
 val scalaList = jArrayList.asScala
 
 scalaList should be (List("a", "b", "c"))


  19. Google Guava library

  20. • com.google.common.base.Optional • com.google.common.util.concurrent.ListenableFuture

  21. Guava @ Gilt

  22. Guava Optional -> Scala Option Scala Option -> Guava Optional

  23. import com.gilt.gfc.guava.GuavaConverters._

  24. Guava Future -> Scala Future Scala Future -> Guava Future

  25. import com.gilt.gfc.guava.future.FutureConverters._

  26. Java 8

  27. https://github.com/scala/scala-java8-compat

  28. import scala.compat.java8.FutureConverters._ Java 8 Future to Scala Future

  29. import scala.compat.java8.OptionConverters._ java.util.Optional to scala.Option

  30. https://github.com/sullis/java-scala-interop-examples

  31. The end

  32. None