Java17クイズ📘 Q. この結果は？ List.of(1,2,3,4) .stream() .filter(n -> n % 2 == 0) .mapToInt(Integer::intValue) .sum(); A. 4 B. 6 C. 10

答え：A Java17ではswitchが式として使える。条件分岐をスッキリ書ける。

Java17クイズ📘 Q. switch式の特徴は？ A. 値を返せる B. break必須 C. if文より遅い

Java17クイズ📘 Q. この結果は？ List.of(1,2,3) .stream() .map(n -> n * 2) .forEach(System.out::print); A. 123 B. 246 C. 12

Java17クイズ📘 Q. 次のラムダ式で正しいのは？ A. (x) => x * 2 B. (x) -> x * 2 C. x := x * 2

Java17クイズ📘 Q. recordの特徴は？ A. getterやequalsを自動生成 B. 必ず継承が必要 C. abstract専用

Agent connection failed due to Java 11/17 mismatch. Upgraded all servers to Java 17 and verified builds ran successfully on the agents ✅ 📌 Blog: devrajesh.hashnode.dev/day-7… 🐙 GitHub: github.com/Rajeshcoder10/100… #DevOps #Jenkins #Java17

dev環境すらない中で ・springboot3→4(java17→25) ・flyway導入 ・デザインリニューアル(DB構成ガッツリ変更) ・ec2別インスタンス立ち上げて移行(al2→al2023, tomcat, datadog設定など) ・js→ts,css→scss ・recapcha導入 の改修量でサーバー停止からリリースまで1時間以内に終わったのすごい

おっしゃあIntelMACにjava17入ったぜぇ

dolphin の Java17 対応版は公開してます。 github.com/air-h-128k-il/Ope… が、 >旬が過ぎてしまった という通り、Java のデスクトップ UI はオワコン感強いです。

4/21 ・7日間でハッキングをはじめる本（Day4） ・応用情報　演習 Burp Suiteのインストールに成功した👏Java17に対応できるバージョンを選んだらうまくいった。 それにしてもSQLインジェクション攻撃恐るべし。IDもパスワードも無駄になる。 #7日間ハッキング #勉強記録

Minecraftしてる。軽量化について、1.20.1はjava17だからZGCが無くて難しい。

Domain models getting messy with random subclasses everywhere? Been there — someone always adds a weird new payment type and suddenly your strategy pattern explodes 😩 Java 17 Sealed Classes changed the game for me. Now the compiler itself enforces exactly who can extend your types. No more surprise subclasses in production. Here’s a clean real-world example I use in Spring Boot services: sealed interface Payment permits CreditCardPayment, UpiPayment, WalletPayment {} final class CreditCardPayment implements Payment { ... } final class UpiPayment implements Payment { ... } Perfect for domain-driven design, strategy patterns, or handling different payment flows inside your microservices. Less bugs, better readability, and the IDE gives you exhaustive switch warnings for free. Small feature, but it feels like getting superpowers. Who else is using Sealed Classes in their Spring Boot projects? Or are you still on traditional inheritance? Drop your thoughts below 👇 I read every reply! #Java17 #SpringBoot #Microservices #BackendDev

Java 17 Records – perfect DTOs for Spring Boot APIs 
Tired of boilerplate DTOs with getters, setters, equals, and hashCode? Java 17 Records got your back 👀 public record OrderDto(String id, BigDecimal amount, LocalDateTime placedAt) {} Immutable by default, super clean in controllers & services. 
Pro tip: Pair with @JsonProperty for custom JSON names. Used this in a recent high-traffic service – code became 40% shorter. Game changer? Yes. #Java17 #SpringBoot

Spring Boot auto-config Java 17 = less boilerplate Building microservices and still writing 50 lines of config? Spring Boot 3 on Java 17 is the cheat code 👀 • Auto-configuration wires everything (no more manual beans for 80% of cases) • Java 17 Records = instant immutable DTOs • GraalVM native images = startup in <50ms Cut my service setup time in half last project. What’s your favorite Spring Boot starter? Drop it below! 👇 #SpringBoot #Java17 #Microservices

Nyie nao kila mwaka sasa eeeh ??? Bado tunatumia Java17 wakuu

🔹 Java 17 Sealed Classes – Interview Perspective (3 mins) 🧵 🧵 I’ve shared a quick discussion on Sealed Classes & Interfaces in Java 17, explained through a practical scenario. The example covers a Payment Gateway API response model, where sealed classes help: • Restrict permitted response types • Enforce fixed response structures as per service agreements • Prevent unintended extensions • Improve domain modeling clarity This is a real-world interview-style question focused on modern Java design decisions, not just syntax. #Java17 #SealedClasses #JavaInterview #BackendDevelopment #SoftwareDesign #BitBee

なお、Java17 対応の dolphin クライアントはこうした。 github.com/air-h-128k-il/Ope…

Java11→17 Java17→21 Java21→25 のアップグレード専用のInstructionsが awesome-copilotにあるの初めて知った 移行楽になりそうなのはそうだけど バージョン差異も簡単に見れるの流石に強いな？

OmniFaces 5.0 released! balusc.omnifaces.org/2025/12… Fully alligned with Jakarta EE 11 😎 #OmniFaces50 #Faces41 #JakartaEE11 #Java17