Javantura v6 - Java in Croatia and HUJAK - Branko Mihaljević, Aleksander Radovan
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This document provides information about HUJAK, a Croatian organization that promotes Java and software development. It discusses HUJAK's role in organizing Java conferences in Croatia, supporting STEM education for children, and connecting Java developers. It also summarizes Java's continued popularity and growth, and outlines some of the upcoming projects that aim to further develop the Java programming language.
Javantura v6 - Java in Croatia and HUJAK - Branko Mihaljević, Aleksander Radovan
- 1. dr. sc. Branko Mihaljević and Aleksander Radovan HUJAK www.hujak.hr 1 Java in Croatia and HUJAK Welcome to Javantura v6! HUJAK - B. Mihaljević and A. Radovan
- 2. Before we start – some Javantura info • General info at javantura.org • Latest schedule at javantura.com/schedule • On social networks you can use #Javanturav6 • Halls A/B – this one; after split at noon – Hall A is on the right, Hall B is on the left • Hall C – on the first floor, upstairs and left from the elevators • Lunch – upstairs • Conference closing (with some prizes) at 6 pm • After that we can go for a drinkup ;-) • Javantura v6 post-conference survey will be sent to your email Thank you all for coming today! ☺ www.hujak.hr 2HUJAK - B. Mihaljević and A. Radovan
- 3. Javantura v6 sponsors www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 3 Thank you!
- 4. What/who is HUJAK? HUJAK is… YOU!!! www.hujak.hr 4HUJAK - B. Mihaljević and A. Radovan
- 5. HUJAK members ☺ www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 5
- 6. What is HUJAK doing? • Trying to connect people that like software development and (mostly) Java • Organizing Java-related conferences and other gatherings • Helping our members to find developers, partners and clients • Popularizing programming and software development • Helping in STEM reachout to children and younger students • Popularizing Java among students and developers • Many other things… www.hujak.hr 6HUJAK - B. Mihaljević and A. Radovan
- 7. A few nice things happened in 2018… • Java Zagreb meetups – many great meetups so far • Java in high schools initiative with Oracle Academy • Croatian Makers league (IRIM) continues • Micro:bit, Logo, mBot, Scratch, Arduino, Little Bits… • Digital Academy (Algebra) • ScratchJr, RunMarco, Studio Code, Play Lab, Scratch, App studio, micro:bit, Arduino… • Code Club Croatia (Programerko & STEMI) • Udruga za darovitu djecu "Dar" and many many others • Two great Javantura and JavaCro conferences ☺ www.hujak.hr 7HUJAK - B. Mihaljević and A. Radovan
- 8. Calendar of Java-related Conferences in EU • HUJAK's conference calendar is available at: hujak.hr/kalendar/ • Take a look at May 2019 • P.S. If we are missing some event please send email to info (at) hujak.hr www.hujak.hr 8HUJAK - B. Mihaljević and A. Radovan
- 9. Java-related Conferences in Croatia www.hujak.hr 9 Conference Location Date Sessions Tracks Attendees Countries HrOUG 2018 Rovinj 16.-19.10.2018. 70 7 370 - JavaCro'18 Rovinj 7.-9.5.2018. 47 5 300 15 Javantura v5 Zagreb 17.2.2018. 26 3 300 - JavaCro'17 Rovinj 10.-12.5.2017. 50 5 280 15 Javantura v4 Zagreb 11.2.2017. 27 3 300 - HrOUG 2016 Rovinj 18.-22.10.2016. 7 (od 96) 1 (od 9) 450 11 JavaCro'16 Rovinj 18.-20.5.2016. 56 5 260 15 Javantura v3 Zagreb 20.2.2016. 23 - 300 - JavaCro'15 Rovinj 10.-12.5.2015. 46 5 200 11 Javantura v2 Zagreb 15.11.2014. 16 - 160 - JavaCro'14 Poreč 11.-13.5.2014. 50 5 220 11 Javantura v1 Zagreb 22.2.2014. 12 - 150 - WebCamp 2013 Zagreb 26.10.2013. 24 - 600 - HrOUG 2013 Rovinj 15.-19.10.2013. 11 (od 90) 1 (od 7) 370 12 JavaCro'13 Tuhelj 3.-5.6.2013. 50 5 200 - HrOUG 2012 Rovinj 16.-20.10.2012. 11 (od 114) 1 (od 7) 370 13 WebCamp 2012 Zagreb 24.11.2012. 24 - - Java 2012 Tuhelj 29.-30.5.2012. 34 7 170 - HrOUG 2011 Rovinj 18.-22.10.2011. 12 (od 96) 1 (od 9) 460 11 This is our 20th conference!!! ☺ #Javantura #JavaCro #HrOUG #proud HUJAK - B. Mihaljević and A. Radovan
- 10. 170 200 150 220 160 220 280 260 300 280 300 300 300 34 50 12 50 16 46 23 56 27 50 26 47 28 0 20 40 60 80 100 120 140 0 50 100 150 200 250 300 350 Sessions Attendees 20 conferences in 7 years and we are still there ☺ www.hujak.hr 10 JavaCro and Javantura conferences in numbers HUJAK - B. Mihaljević and A. Radovan
- 11. JavaCro conferences – 2012-2018 11www.hujak.hr HUJAK - B. Mihaljević and A. Radovan
- 12. Javantura conferences – 2014-2018 www.hujak.hr 12HUJAK - B. Mihaljević and A. Radovan
- 13. Conferences HUJAK supports www.hujak.hr 13HUJAK - B. Mihaljević and A. Radovan
- 14. Partners & Friends www.hujak.hr 14HUJAK - B. Mihaljević and A. Radovan
- 15. "Moving Java Forward Faster" • "For Java to remain competitive it must not just continue to move forward —it must move forward faster." Mark Reinhold www.hujak.hr 15 20191995 1998 2001 2004 2007 2010 20222016 2018-03-20 2017-09-21 2014-03-18 Java EE 7 2013-06-12 HUJAK 2011-12-132011-07-28 Java EE 6 2009-12-10 Java SE 6 Mustang 2006-12-11 Java EE 5 2006-05-11 Java 5 J2SE 5.0 Tiger 2004-10-04 J2EE 1.4 2003-11-11 Java 1.4 J2SE 1.4 Merlin 2002-02-06 J2EE 1.3 2001-09-24 Java 1.3 J2SE 1.3 Kestrel 2000-05-08 J2EE 1.2 1999-12-12 Java 1.2 J2SE 1.2 Playground 1998-12-08 JPE Java Professional Edition 1998-05 Java 1.1 JDK 1.1 1997-02-19 Java 1 JDK 1.0 Oak Java JDK Alpha- Beta 1995 © 2018, HUJAK 2010-01-27 Java SE 7 Dolphin Java SE 8 Spider Java EE 8 2017-09-21 2013 1996-01-23 2018-09-25 2019-03 2019-09 2020-03 2020-09 2021-03 2021-09 Jakarta EE Eclipse Foundation HUJAK - B. Mihaljević and A. Radovan
- 16. • #1 Development Platform • Continued growth of Java for 23 years • A Few Dozen Billion Devices run Java • 10 Million Java Developers in the world • Many have Java Certificates • But not only Java – 50+ JVM languages • including Clojure, Groovy, Scala, JRuby, Jython, Fantom, Kotlin, Ceylon, Xtend, X10, LuaJ, Golo, Frege, Mirah, Eta… and JavaScript So, what is Java … for us? www.hujak.hr 16HUJAK - B. Mihaljević and A. Radovan
- 17. How is Java currently holding? • TIOBE index for February 2019 www.hujak.hr 17HUJAK - B. Mihaljević and A. Radovan Rank Language Ratings 1 Java 15.876% 2 C 12.424% 3 Python 7.574% 4 C++ 7.444% 5 VB .NET 7.095%
- 18. What about trends? • Google Trends • Java vs Python vs C vs C++ vs JavaScript www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 18 Average Last 14 years Last year (2018)
- 19. What about Java download? • When you type "Java download" in Google you'll probably get www.java.com • Where you can download JRE Java 8 Update 201 • What about the latest JDK download(s)? www.hujak.hr 19HUJAK - B. Mihaljević and A. Radovan
- 20. Available JDKs (and Licenses) • Oracle JDK www.oracle.com/technetwork/java/javase/downloads/ • Oracle Binary Code License (BCL) with FoU (Field of Use) restrictions $$$ ? • Many OpenJDKs: • Oracle OpenJDK jdk.java.net/11/ • GNU General Public License version 2, with the Classpath Exception (GPLv2cpe) with no restrictions • Security and bug fix updates every (and only for) six months (until next JDK, no overlap) • AdoptOpenJDK's OpenJDK adoptopenjdk.net • OpenJDK 8 or OpenJDK 11 (both with LTS) • Hotspot JVM or OpenJ9 JVM (former IBM commercial JVM, open-sourced to Eclipse foundation) • Azul's Zulu OpenJDK www.azul.com/downloads/zulu/ • From JDK 6 to JDK 11, wide platform support (Windows, Linux, macOS…) • Others: Amazon's Corretto OpenJDK, RedHat's OpenJDK, SAP's SapMachine OpenJDK, Linux distribution's OpenJDKs … www.hujak.hr 20HUJAK - B. Mihaljević and A. Radovan
- 21. • Oracle's Java SE Downloads • Currently available downloads of Oracle's JDK: • Java SE 11.0.2 • Java SE 8u201 www.hujak.hr 21 Java Download HUJAK - B. Mihaljević and A. Radovan
- 22. Open Sourcing and Converged Binaries • No functional difference between OpenJDK and Oracle JDK in JDK 11+ • Open sourcing most of the closed-source parts of JDK • Flight recorder, Mission control … • Removing some closed-source parts • Browser Plugin, Java Web Start, JavaFX … • Backwards Compatibility • Applications depending on Java SE should work www.hujak.hr 22 Oracle JDK 10 OpenJDK 10 Java SE 10 OpenJDK & Oracle JDK 11+ Java SE 11+ HUJAK - B. Mihaljević and A. Radovan
- 23. OpenJDK Release Model • New Features included (only) when ready • Feature release versions released every 6 months (in March and September) • Update releases shipped quarterly (in January, April, July, and October) • Long-term support (LTS) feature release every 3 years • Starting with JDK 11 (September 2018), updates available for at least 3 years • LTS for all releases is not practical • Starting with JDK 11 (September 2018), then JDK 17 (September 2021), then JDK 23… • For Oracle's commercial customers updates available for at least 3 years or longer • JDK 12 – in General Availability on March 19, 2019 www.hujak.hr 23HUJAK - B. Mihaljević and A. Radovan
- 24. Is Java still "Free"? • $free as in free beer (the cost) vs free as in free speech (what can you do) • For $free use of OpenJDK binaries • For free use of OpenJDK with GPLv2+CE license • Updates refers to code patches – typically $free • Support means fixing bugs and answering questions – was never $free • LTS release every 3 years – does not mean 3 years of $free updates • Oracle JDK 11 (and onward) can only be used in production with commercial Java SE subscription • Free JDK 11 (and later) are only OpenJDK binaries • However, Oracle JDK 8 can be used indefinitely for free • Without any further security patches and bug fixes www.hujak.hr 24HUJAK - B. Mihaljević and A. Radovan
- 25. OK, but what do we use in reality? • JVM Ecosystem Report 2018 by Snyk and Java Magazine, October 2018 snyk.io/blog/jvm-ecosystem-report-2018 www.hujak.hr 25HUJAK - B. Mihaljević and A. Radovan
- 26. Which Java SE version in production? • Which Java SE version do you use in production for your main application? • Note: This was before Java 11 www.hujak.hr 26HUJAK - B. Mihaljević and A. Radovan
- 27. Which JDKs are in production? • Which Java vendor’s JDK do you use in production for main applications? www.hujak.hr 27 Source: JVM Ecosystem Report, Snyk, 2018, https://snyk.io/blog/jvm-ecosystem-report-2018/ HUJAK - B. Mihaljević and A. Radovan
- 28. Which Java SE version in the future? • How do you plan to respond to Java’s new release cycle? www.hujak.hr 28HUJAK - B. Mihaljević and A. Radovan
- 29. What is our advice? • Obviously – use Java 11 ☺ • OpenJDK or Oracle JDK or any other – it's up to you www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 29
- 30. More Long-term Java Future • Project Amber – incubator for smaller, productivity-oriented language features and simplifying syntax • Local variable type inference, local variable syntax for lambdas, lambda leftovers, raw string literals, pattern matching, switch expressions… • Project Valhalla – incubator project for advanced JVM and language feature candidates • Value types and specialized generics • Project Panama – to interconnect JVM and native code • Foreign function interface (FFI) as a replacement for JNI • Project Loom – to reduce complexity in writing concurrent applications • Fibres (JVM-level threads) and continuations • Project Metropolis – JVM re-written in Java, i.e. "Java on Java" • Using Graal experience, easier porting, performance to be explored (AOT compiler) • Project Skara – alternative SCM & code review for JDK • Git instead of Mercurial www.hujak.hr 30HUJAK - B. Mihaljević and A. Radovan
- 31. Is Java really "Moving Forward Faster"? • Community opinion: well… yeah! ☺ • Much more frequent Java releases • Faster access to new features • Many new improvement ideas • A lot of maintenance and housekeeping • Java still remains free • However, there is no more JavaOne conference?! • There is and it is larger than ever, but with a new name Oracle Code One – a conference for all developers www.hujak.hr 31HUJAK - B. Mihaljević and A. Radovan
- 32. Where can you learn Java? • On every major university in the world • On all major online learning and MOOC platforms www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 32 &
- 33. How can you (and your kids) start? • Scratch (7-16 g.) i ScratchJr (5-7 g.) • scratch.mit.edu, MIT Media Lab • Alice (11-18 g.) • www.alice.org, Carnegie Mellon University • Greenfoot (13-20+ g.) • www.greenfoot.org, University of Kent • BlueJ (15-20+ g.) and jGRASP • Eclipse, IntelliJ IDEA, NetBeans … • Other: robotics, Minecraft, Raspberry Pi… www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 33
- 34. However, the most interesting are… robots! www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 34 Photo from Javantura v3 conference, author Johan Janssen
- 35. What about learning Java in Croatia? • You can learn Java practically in each and every computing / computer science / information technology university and/or college study program in Croatia • Java is #1 introductory programming language for decades! ☺ • In 18 cities: Bjelovar, Čakovec, Dubrovnik, Krapina, Križevci, Osijek, Pula, Rijeka, Sisak, Split, Šibenik, Varaždin, Velika Gorica, Virovitica, Zabok, Zadar, Zagreb, and Zaprešić • On 37 or more educational institutions including 7 public universities and 15 private colleges • In 80 or more educational programs (BS, MS, spec, PhD) www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 35 Source: Gdje studirati računarstvo i informatiku u Hrvatskoj?, www.bug.hr/obrazovanje/gdje-studirati-informatiku-u-hrvatskoj-2018-4185, Bug, 2018.
- 36. What about getting hired? • Do we have to tell you? Really? ☺ • Number of job offers on one famous job portal in ICT category www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 36
- 37. Instead of conclusion… • OK, enough from us, there are 27 interesting talks today so… • Let's start another great #Java adventure Javantura v6 Warm welcome from HUJAK and CroDuke! www.hujak.hr HUJAK - B. Mihaljević and A. Radovan 37