Summary of JDK10 and What will come into JDK11
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Newer version is here https://www.slideshare.net/nowokay/summary-of-jdk10-and-what-will-come-into-jdk11-99363835 Summary of JDK10 and What will come into JDK11 so far
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Summary of JDK10 and What will come into JDK11
- 1. Summary of JDK10 and What will come into JDK11 2018/5/28 Naoki Kishida
- 2. About me • Naoki Kishida • LINE Fukuoka • @kis
- 3. Agenda • New Release Model • About JDK 10 • About JDK 11 • About Java Support
- 5. 6-monthly release • Oracle had announced they will release Java every 6 months at 2017/9/6
- 6. Java new release cycle. • Feature release every 6 months – March and September(春分の⽇/秋分の⽇) • Maintenance release every 3 months – April and July for March release – October and January for September release • Long Term Support every 3 years – The first LTS is for JDK 11 • Oracle JDK will be for only Oracle customer – Use OpenJDK instead.
- 7. Version number • 2018/03 Feature release JDK10 • 2018/04 Maintenance release JDK10.0.1 • 2018/07 Maintenance release JDK10.0.2 • 2018/09 Feature release JDK11 LTS • 2018/10 Maintenance release JDK11.0.1 LTS • 2019/01 Maintenance release JDK11.0.2 LTS
- 8. Java SE 8 support is extended • Oracle has extended Java SE 8 support at least until 2019/1 • It is available for the personal use until 2020/12 • Java SE 8 support will finish after 3 months of JDK 11 release. • We should move to JDK 11 by 2019/1 http://www.oracle.com/technetwork/jp/java/eol-135779-ja.html
- 9. Desktop technology • Applet and Web Start is no longer supported after JDK 11 • JavaFX will not be bundled with JDK11 – So far OpenJDK had not bundled JavaFX • AWT and Swing will be supported – There are many commits for JDK 11
- 10. About JDK 10
- 11. Java 10 JEPs • 286 Local-Variable Type Inference • 296 Consolidate the Repository • 304 GC Interface • 307 Parallel Full GC for G1 • 310 Application Class-Data Sharing • 312 Thread-Local Handshakes • 313 Remove the Native-Header Generation Tool(javah) • 314 Additional Unicode Language-Tag Extensions • 316 Heap Allocation on Alternative Momory Devices • 317 Experimental Java-Based JIT Compiler • 319 Root Certificates • 322 Time-Based Release Versioning
- 12. 286: Local-Variable Type Inferences • var list = new ArrayList<String>() • `var` is not a keyword – but a special type • We can use `var` as a variable name • We can use `var` as a method name • We can not use `var` as a class name
- 13. Where can we use `var`? • OK – Right Oprand has the type • var strs = new ArrayList<String>(); • var path = Path.of(“http://example.com”); • Should not – Enclosing type • ex: Supplier<String>, Optional<String> ListenableFuture<String> • var name = findName(id); print(name.get()); // How should we care?
- 14. Another usage for `var` • Anonymous class become useful – ex: defining a local method • var m = new Object() { int twice(int x) { return x * 2; } }; print(m.twice(3));
- 15. 304: Garbage-Collector Interface • GC is modularized. • There are many GCs that will come. – Epsilon GC – ZGC – Shenandoah • Not to control GC by user code
- 16. 317: Experimental Java-Based JIT Compiler • Project Metoropolis – java-on-java • We can write JVM even with Scala? – There is a possibility.
- 17. 307: Parallel Full GC for G1 • G1GC had been the default GC on JDK 9 • Full GC for G1 was not parallel. • Until JDK 8, Parallel GC was the default • To smooth migration, Full GC for G1GC also parallelize. • But full GC should not occur. – Ideally, it has no effect for us.
- 18. 310: Application Class-Data Sharing • CDS for system class is introduced in JDK 5 • Share class data between multiple JVM on the same machine – startup performance – reduce the resource footprint • JDK 10 allow to use CDS for application class
- 19. 312: Thread-Local Handshakes • JVM can stop an individual thread – stop not just all thread
- 20. 313: Remove the Native-Header Generation Tool(javah) • javah is removed • use `javac –h` instead
- 21. 314: Additional Unicode Language-Tag Extensions • Enhance java.util.Locale • additional Unicode extensions of BCP 47 language tag – currency type – the first day of the week – region override – time zone
- 22. 316: Heap Allocation on Alternative Memory Devices • Now we can use non-volatile RAM(不 揮発性メモリ) such as 3D XPoint • This will enable the JVM to use different types of memory system
- 23. 319: Root Certificates • OpenJDK doesnʼt have Root Certificates so far • Oracle JDK have had it. • To smooth migration, OpenJDK have had it.
- 24. API Changes • java.io.Reader – long transferTo(Writer) • java.lang.mainagement.RuntimeMXBe an – long getPid() • java.util.List/Map/Set – copyOf(Collection) • java.util.stream.Collectors – toUnmodifiableList/Set/Map
- 25. Docker aware • Until JDK 9, JVM use the platform CPU count/Memory size even if it is running on Docker. • JDK 10, JVM can use Docker setting for CPU count/ Memory size if it is running on Docker. • VM Options – -XX:InitialRAMPercentage – -XX:MaxRAMPercentage – -XX:MinRAMPercentage
- 26. Other Changes • Kerberos configuration file krb5.conf include *.conf in INCLUDEDIR • -d32 and –d64 has been removed • new JavaDoc tag. {@summary} • policytool has been removed • XMLInputFactory.newFactory() has been “de-deprecated” – it had been deprecated by mistake.
- 27. About JDK 11
- 28. Java 11 JEPs • 309 Dynamic Class-File Constants • 318 Epsilon: A No-Op Garbage Collector • 320 Remove the Java EE and CORBA Modules • 321 HTTP Client(Standard) • 323 Local-Variable Syntax for Lambda Parameters • 324 Key Agreement with Curve25519 and Curve448 • 327 Unicode 10 • 328 Flight Recorder • 329 ChaCha20 and Poly1305 Cryptographic Algorithms • 330 Launch Single-File Source-Code Programs
- 29. Expected JEPs for JDK11 • 326 Raw String Literals • 325 Switch Expressions • 181 Nest-Based Access Control
- 30. Launch Single-File Source-Code Programs • java Hello.java – The file name does not need to be related with the class name • Shebang – #! /usr/bin/java –source 10 – chmod +x hello – ./hello
- 31. Raw String Literals • var sql = ```select NAME from MEMBER where id=1``` • var regexp = ```hello¥¥n``` // same as “hello¥¥¥¥n” • How to address indent
- 32. Switch Expressions • Now `switch` is a statement • int i; switch (s) { case “start”: case “begin”: i = 0; break; case “end”: i = 1; break; default: i = 2;
- 33. Switch Expressions • int i = switch (s) { case “start”,“begin”-> 0; case “end” -> 1; default -> 2; }
- 34. Local-Variable Syntax for Lambda Parameters • list.map(s -> s.toUpperCase()) .collect(toList()) • list.map((var s) -> s.toUpperCase()) .collect(toList()) • list.map((@Nullable var s) -> s.toUpperCase()) .collect(toList())
- 35. HTTP Client(Standard) • Graduate the incubator • var client HttpClient.newHttpClient(); var url = URI.create(url); var req = HttpRequest.newBuilder(uri).build(); HttpResponse<String> res = client.send( req, HttpResponse.BodyHandlers.ofString( Charset.forName(“utf-8”)); return res.body();
- 36. Epsilon: A No-Op Garbage Collector • Do nothing! • For evaluate the performance of another feature – GC will make a noise
- 37. Remove the Java EE and CORBA Modules • No one uses CORBA! • The size is large • Removing them, JDK will be smaller
- 38. Flight Recorder • Logging the performance • Now it is an open source • Caution – for before JDK10 is still commercial
- 39. Unicode 10 • Support Unicode 9 and Unicode 10
- 40. Dynamic Class-File Constants • Use invokeDynamic for constant initialization
- 41. Key Agreement with Curve25519 and Curve440 • RFC 7748 • More efficient and secure than ECDH
- 42. ChaCha20 and Poly1305 Cryptographic Algorithms • RFC 7539 • Stream cypher • Not support for TLS • The first step of supporting in TLS
- 43. Nestmate • To address inner class accessibility • from Valhalla!
- 44. API changes in JDK11 • String::repeat/lines/strip... • Predicate::not • Optional::isEmpty • Files • ArrayIndexOutOfBoundsException – the message is changed
- 45. String • repeat • isBlank • lines • strip/stripLeading/stripTrailing
- 46. Predicate::not • lines.filter(s -> !s.isEmpty()) → lines.filter( Predicate.not(String::isEmpty))
- 48. Files • String Files.read(Path) • Path FIles.write(Path, String) • Files.isSameContent(Path, Path)
- 49. ArrayIndexOutOfBoundsException • jshell> new int[]{}[0] | java.lang.ArrayIndexOutOfBoundsException thrown: 0 | at (#1:1) -> jshell> new int[]{}[0] | Exception java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 | at (#8:1)
- 50. How about Stream#toList？ • modifiable? unmodifiable? • What order? • “it nulls a property of the Stream API we have take time to keep. The whole Stream API doesn't depends on the Collection API”
- 52. Oracle JDK • Same as the current support • Very expensive for web servicer • 100 servers on AWS -> 1おくえん
- 53. OpenJDK • Official publishment says it has only 6 months support for each JDK release. No LTS • Mark Reinhold said OpenJDK will have LTS – but not on the web site yet – LTS support is for 3 years. No overlap.
- 54. AdoptOpenJDK • Project by London JUG • IBM supponsered • Provide pre-build JDK • LTS support for 4 years
- 55. Zulu • Provided by Azul System • Free to download and use • Enterprise support – 100 servers $28,750/year – unlimited servers $258,750/year
- 56. Support the new era after Heisei • Start to support the new era as NewEra • JDK12 will release 2019/3 • The new era will release early 2019/4 • JDK maintenance release will be late 2019/4 – JDK 12.0.1 • The new era will start 2019/5
- 57. Summary • がんばろ