Daily Archives: October 24, 2018

[2018 oracle code one] wednesday keynote

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Wednesday keynote

For more blog posts, see The Oracle Code One table of contents

IBM

Pratik Patel & Mary Grygleski. And John Duiovich & Tim Ellison (An four people from the community)

  • #callforcode. Disaster prep code.
  • Cloud is reality whether public cloud or in house cloud
  • Eclipse foundation community – Jakarta EE and Microprofile
  • starting to do more polyglot environments in cloud native; puts more pressure on JVM
  • challenges – varied programming models, dynamic environment, cloud economics (paying for resources used)
  • opportunities – acss to powerful services, devops integration, responsive behavior
  • J9 VM is open source (Open J9)
  • Next level – JVM itself becomes a cloud service
  • Demo of remote JIT service on two laptops (JIT compilation in the cloud)
  • Adopt OpenJDK
    • started Adopt a JSR when London Java Community started on EC
    • Looked at how to make easier to build OpenJDK
    • Build farm to crank out many different versions of Java
    • Aiming to support OpenJDK LTS releases for 4 years
  • Brought up all BM speakers. A lot of people! Threw socks at audience. One guy ran down the aisle so they made it more than aa few rows back.

Groundbreakers Avengers

  • Roles in skit
    • Dr Strange
    • Average developer
    • Thano Duke is villain – popping little kid balloons
    • JUG leaders as superheros. Two have masks so don’t kow who are. One has a Groot puppet!
    • Un conference forces! Said unconference rules
  • Did shout outs by country. Brazil was quiet. Asia was quiet. The   US was quieter than it should have been. The build up to the Netherlands orange shirt folks was great. Loud and in front.
  • Plot: need to find infinity stones. Had hidden objects under chairs
  • Un conference people brought out beer on stage. Had a “stone planning” session. Listed random acronyms and patterns
  • Got dig in about the lack of beer at ignite
  • Silly programming whiteboard exercise using tech buzzwords to see how any balls can fit in a schoolbus Good pun on bus!
  • A bunch of jokes about uploading the stones with different technologies
  • Used Java beyond the cloud to get Thanos Duke from outer space/orbit
  • Brought out Duke in costume on stage along with handler! Duke waddles so the speed is hillarious!

[2018 oracle code one] emerging languages bowl

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Emerging Languages Bowl

Speaker: Trisha Gee (JetBrains) and Eugene Petrenko (JetBrains) – moderated by Raghavan “Rags” Srinivas

For more blog posts, see The Oracle Code One table of contents

Rags talked about how this is a different format than the usual “script bowl”. I’ve never been so not disappointed

Java (Trisha)

  • Inspired features from scripting languages
    • Lambdas
    • Streams – would be hard to use without lambdas because would need anonymous inner classes
    • RPEL
    • var
  • Not a functional language, but idioms that came from functional languages
  • Not in Java
    • Immutable “var” – do you use var/val, var/let, var/final var? We have “final var”, but it isn’t immutable. Just prevents re-assignment. But are getting immutable collections.
  • Future
    • data classes [records]- Kotlin has this. Preview feature in Java 12
    • multi-line strings – Groovy has this.
    • Switch statements/pattern matching. Preview feature as well
  • Preview features are a good thing because can discuss with real code

Kotlin (Eugene)

  • Statically typed
  • Now official on Android
  • Concise – minimal boilerplate
  • Safe – avoid classes of errors like null pointers
  • Interoperable – use JVM and Android libraries
  • Tool friendly – works with any Java IDE
  • Can combine Java and Kotlin in same module
  • Kotlin invented in 2000. Version 1 came out in 2005
  • Can target Java 1.6 (or higher if want)

“The only way to learn a new programming language is by writing programs in it” -Dennis Richie

IntelliJ has plugin which gives sample tasks

Kotlin demo

  • fun main() {} – function – defaults to void return type
  • fun main() : ReturnType {} – function with return type. Can use generics in types
  • “Hello ${abc}” – string interpolation
  • Triple quotes – multi line string
  • trimIndent() – extra method
  • var/val – mutable/immutable
  • var x : String – not nullable
  • var x : String? – nullable
  • if ( x is Type) – auto casts inside if statement
  • fun Class.method() = impl – add method from outside class. It can even use instance variables from inside the class.
  • sealed class – all subclasses must be defined in same file
  • when/is – pattern matching

My take: I don’t know what the session was supposed to be, but this was fine. It was 10 minutes of Trisha and Eugene introducing Kotlin for 30. I have seen the intro to Kotlin talk before though. That said, I still needed Google for what one thing did.

 

[2018 oracle code] psa java is still free

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Public Service Announcement: Java is Still Free

Speaker: Trisha Gee (Java Community), Simon Maple  (LJC – London Java Community), Roman Kennke (Red Hat) (Didn’t catch his name) Simon Ritter (Azul), Tim Ellison (IBM) + Moderated by Steve Poole (IBM),

For more blog posts, see The Oracle Code One table of contents

This talk is mainly Q&A. The high points.

  • What do the recent changes mean to us?
    • Simon R – 6 month release cycle/faster releases/new features more quickly. Oracle said impractical to provided long term support for all releases. Strategy similar to what Ubuntu does; one release every three years is LTS and others are feature releases. JDK 11 under different license. If download from oracle.com, Oracle Technology License Agreement – can use in dev/test/demos free. Must subscribe to use in Prod. If download from openjdk, can use completely free – GPL v2. OpenJDK has updates for 6 months. Open JDK source code product is what everyone uses to build. Oracle will contribute changes to Open JDK for 6 months. This means Adopt Open JDK will need someone to backport fixes from later releases to add long term support. Someone (probably RedHat) will have to step up to lead Open JDK project for JDK 8 and 11 to do the work of backporting fixes. Azul has Zulu which is Open JDK build. Have community version which is free and a commercial version where provide support for less $ than Oracle.
    • Tim – At IBM, Java is an enabler. IBM and customers have a lot invested in Java. Goal is not to make money from Java directly. Money comes from higher level products that run on Java. Goal/working on contributing back to OpenJDK and Eclipse community. Also offer a support contract. Work for hire. IBM represents problem you have in Java community.
  • IBM will contribute to OpenJDK if find bug fixes. Will this make branches differ?
    • Tim – for 6 months Oracle doing in public OpenJDK. After that, will be an internal fork from Oracle. The public OpenJDK one will be under control of the stewards of that project. There is a risk that the fixes are different. [there’s always been that risk for IBM JDK, no?]
    • Simon R – Oracle will upstream fixes into OpenJDK 11 until JDK 12 comes out. After that, not as easy as just back porting JDK 12 fixes. Since there are new features added, need to determine what is a bug fix or security fix that needs to be back ported. Further, features get removed (ex: CORBA module). Therefore there are no bug fixes/security patches for that feature to back port.
    • Roman – Took over OpenJDK 6 and then OpenJDK 7 updates after Oracle stepped back. Plan to do the same for OpenJDK 8 and 11 when that happens. RedHat plans to support OpenJDK 8 until 2023.
    • Simon R – Private group behind OpenJDK for major vendors that contribute. This is where security issues get discussed so patches can be made available. It’s not just Oracle. Covers versions as long as anyone is supporting.
  • Has Oracle committed to giving vulnerability group opportunity to back port before CVE released publicly?
    • Simon R – Yes. They are discussed earlier
  • Scott Selikoff asked how similar OpenJDK and Oracle JDK are at release?
    • Trisha – Aiming for it to be the same binary. Not literally the same because the license is in the binary.
    • Roman – Built from same sources
    • Simon R – Functionally the same
    • Trisha – If a bug is in one, it should be in both
    • SImon M – unlocking commercial features doesn’t make sense in OpenJDK, but does in Oracle JDK
  • Scott Selikoff asked if recommend using a non-LTS release?
    • Trisha – “it depends”. Large enterprises will go with LTS. Some people will be happy to use new features as they come in. Stable enough to use in prod. Non-banks may be happy to use.
    • Simon R – Java 13 and 15 are MTS (medium term support). Commercial decision on how long something supported
    • Trisha – LTS and updates are not the same thing. In past, were getting updates but not support
  • Is JDK license included in Oracle product
    • Simon R – ask Oracle
    • Trisha – thinks comes with product
  • If on Zing JDK 8 now and willing to upgrade once in next two years, what/when go?
    • Simon R – Following same LTS strategy as Oracle for Zing. Use Zulu/Red Hat/AdoptOpenJDK as alternative to Oracle JDK
  • What are ramifications of license period lapsing in internet sparse location.
    • Tim – ask Oracle. Wouldn’t stop working, but ask Oracle about licensing.
  • Why call OpenJDK 11 LTS if only get support for 6 months. What are plans for CVEs after that 6 month period. Using a CMS requires supported JDK.
    • Roman – RedHat supporting JDK 11 for many years. OpenJDK patches still free.
    • Tim – cost depends on where you get JDK from. Oracle created 3 year LTS concept. Vendors stepped up to align.
    • Simon M – LJC (London Java Community) and many companies using Adopt OpenJDK platform turned into build engine to make OpenJDK binaries available to community. Aiming for 4 years for LTS releases. Support people typically buy covers support and security. Support contracts gets vendor commitment to fix reported issues. Vs filing a bug and hoping it will happen. Most people care about CVEs not issues they specifically found.
    • Trisha – Oracle talking about Oracle releases OpenJDK. But not the only people to produce OpenJDK binary.
    • Simon M – Adopt OpenJDK supports more platforms than Oracle
    • Simon R – Difference between source code and binaries. Source code contains changes. Someone still needs to create the binaries. Aka vendors.
    • Roman – Trying to create OpenJDK binaries
  • Suppose Oracle makes small features to their branch. Do you see them doing that?
    • Trisha – that’s not how it works
    • Simon R – Oracle doing the opposite. Removing commercial features from Oracle JDK.
  • Will RHEL and WebSphere use LTS versions?
    • Roman – yes
    • Tim – Yes for IBM WebSphere
  • Thoughts on Mark R and running build with latest every 6 months?
    • Simon R – It’s about preparing for the future. Ideally you learn impact every 6 months.
    • Simon M – APIs can be removed. By testing on feature releases, better understanding in advance of how app could break.
    • Trisha – Changes need to make to app should still work on Java 8 so can make changes in app without having to upgrade
    • Simon M – jdeps tells you which APIs you are using that are marked for removal.
  • Will Open JDK and Oracle JDK version string to be exactly same?
    • Trisha – Yes. Version string under JEP.
  • Oracle committed to someone in a private meeting that will give at least 18 months lead time on removing documented features.
    • Simon R – very publicly stated one release (6 months) warning
    • Trisha – Stuff deprecated in 9 already gone in 11.
    • Simon M – Two people at Oracle gave conflicting info
    • Tim – Get them to sign it 🙂
  • Someone from Oracle said to ask him the ask Oracle stuff

My take: I wish this talk was better publicized. I also wish Oracle had done this so you could hear all the opinions at once. That said, a big thank you to IBM for setting this up!