Tweet
Tweet

Slide 1

Slide 1 text

© 2018 CloudBees, Inc. All Rights Reserved. JUG Lausanne: Leap from Java 8 to Java 11 in Jenkins. Our war story Oleg Nenashev, CloudBees Nov 14, 2018

Slide 2

Slide 2 text

© 2018 CloudBees, Inc. All Rights Reserved. > whoami 2 @oleg_nenashev oleg-nenashev • Based in Neuchâtel • Principal SW Engineer, CloudBees • CloudBees Core • CloudBees Jenkins Support

Slide 3

Slide 3 text

© 2018 CloudBees, Inc. All Rights Reserved. > whoami -jenkins 3 @oleg_nenashev oleg-nenashev • Contributor since 2012 • Jenkins Core Maintainer • Jenkins Ambassador • Platform SIG Leader

Slide 4

Slide 4 text

© 2018 CloudBees, Inc. All Rights Reserved. > whoami -java 2006 - J# and Java ME 2010+ - patches to Hudson/Jenkins 2013+ - Jenkins & Java non-stop @oleg_nenashev oleg-nenashev 4

Slide 5

Slide 5 text

© 2018 CloudBees, Inc. All Rights Reserved. Swiss Jenkins Area Meetup • Building local community • Sharing experiences • Looking for contributors https://www.meetup.com/Swiss-Jenkins-Area-Meetup https://twitter.com/JenkinsMeetupCH 5

Slide 6

Slide 6 text

© 2018 CloudBees, Inc. All Rights Reserved. Java 11 Released on Sep 25, 2018 6

Slide 7

Slide 7 text

© 2018 CloudBees, Inc. All Rights Reserved. 7 Image source: https://medium.com/criciumadev/its-time-migrating-to-java-11-5eb3868354f9

Slide 8

Slide 8 text

© 2018 CloudBees, Inc. All Rights Reserved. Agenda. Jenkins and Java 11 • Why Java 11? • Jenkins architecture overview • Java 11. Our war story • Current status 8 These slides: http://bit.ly/jugl-jenkins-java11

Slide 9

Slide 9 text

© 2018 CloudBees, Inc. All Rights Reserved. Target Audience • Java developers • Hardcore Jenkins Admins 9

Slide 10

Slide 10 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins Intro and Architecture

Slide 11

Slide 11 text

© 2018 CloudBees, Inc. All Rights Reserved. 1. Most popular CI/CD tool in the world 2. 200k+ installations 3. Open-source 4. Big community 5. Plugin ecosystem (>1500 plugins) 6. … Who is Mr. Jenkins? https://jenkins.io 11

Slide 12

Slide 12 text

© 2018 CloudBees, Inc. All Rights Reserved. Under the hood 12 JENKINS Image: https://www.youtube.com/watch?v=Qae_3RDa6sM

Slide 13

Slide 13 text

© 2018 CloudBees, Inc. All Rights Reserved. Under the hood 13 JENKINS Image: https://www.youtube.com/watch?v=Qae_3RDa6sM Under the hood: ● Java ● Groovy ● Jetty ● ...

Slide 14

Slide 14 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins for Java developers Plugins for all common use-cases: ● Maven/Gradle/SBT/etc. ● Test plugins ● Coverage plugins (Cobertura, JaCoCo, ..) ● 14

Slide 15

Slide 15 text

© 2018 CloudBees, Inc. All Rights Reserved. Our road to Java 11

Slide 16

Slide 16 text

© 2018 CloudBees, Inc. All Rights Reserved. Goals 1. Support running Jenkins with Java 11 2. Packages seamlessly run with both Java 8 and 11 3. Get incremental improvements from Java

Slide 17

Slide 17 text

© 2018 CloudBees, Inc. All Rights Reserved. Non-goals… for now ● Go all-in Java 11 ● Updating codebase to Java 11 ● Adopting modules (JEP-261) ● Hardcore optimization for Java 11 17

Slide 18

Slide 18 text

© 2018 CloudBees, Inc. All Rights Reserved. Performance: ● JEP-307: Parallel Full GC for G1 - All instances, OOTB ● JEP-318: Epsilon: A No-Op Garbage Collector - Single-shot Jenkins Masters Security: ● JEP-332: Transport Layer Security (TLS) 1.3 - HTTPs, Jenkins Remoting & Co ● JEP-324/JEP-329: New Key agreement and cryptographic algorithms Experimental features: ● JEP-333: ZGC: A Scalable Low-Latency Garbage Collector ● JEP-317: Experimental Java-Based JIT Compiler (Graal as JIT) Profiling: ● JEP-331: Low-Overhead Heap Profiling - better profiling in production ● JEP-328: Flight Recorder - better profiling in production Java 9...11. Why? 18

Slide 19

Slide 19 text

© 2018 CloudBees, Inc. All Rights Reserved. Java 9...11. Risks ● Modules (JEP-261)… ● Feature deprecation/removal ● Incompatibilities in upstream libraries ● Development Tools 19

Slide 20

Slide 20 text

© 2018 CloudBees, Inc. All Rights Reserved. Timeline 09.2017 – First experiments with Java 9 ● Jenkins World 2017 hackfest ● Baptiste Mathus, Mark Waite 20

Slide 21

Slide 21 text

© 2018 CloudBees, Inc. All Rights Reserved. Initial state. May 2018 Jenkins can build Java 9+ projects ● Using different Java version for build steps ● Supported in Shell steps, Maven Pipeline Plugin, etc. ● Not supported in Maven Project type 21

Slide 22

Slide 22 text

© 2018 CloudBees, Inc. All Rights Reserved. Initial state. May 2018 Jenkins can build Java 9+ projects ● Using different Java version for build steps ● Supported in Shell steps, Maven Pipeline Plugin, etc. ● Not supported in Maven Project type Jenkins cannot run with Java 9+ ● Jenkins Pipeline does not start ● Glitches in Freestyle projects ● Broken process management 22

Slide 23

Slide 23 text

© 2018 CloudBees, Inc. All Rights Reserved. Timeline 09.2017 – First experiments with Java 9 06.2018 – Jenkins and Java 10+ hackathon ● Organized by Kohsuke Kawaguchi (Jenkins creator) ● Blogposts: https://jenkins.io/node/tags/java11/ ● Summary slides 23

Slide 24

Slide 24 text

© 2018 CloudBees, Inc. All Rights Reserved. June 2018. Jenkins & Java 10+ hackathon ● 26 contributors ● Pipeline is working! ● Patches to the core and plugins ● Development tools ● Exploratory testing 24 https://jenkins.io/blog/2018/06/19/jenkins-java10-hackathon-day2/

Slide 25

Slide 25 text

© 2018 CloudBees, Inc. All Rights Reserved. June 2018. Meeting with OpenJDK Jigsaw Team ● Open Q&A with Mandy Chung, Paul Sandoz ● Got feedback for current and incoming obstacles ● Meeting notes: http://bit.ly/jenkins-java10-questions 25

Slide 26

Slide 26 text

© 2018 CloudBees, Inc. All Rights Reserved. Timeline 1. 09.2017 – First experiments with Java 9 2. 06.2018 – Jenkins and Java 10+ hackathon 3. 06.2018 – Java 10 and 11ea preview availability 4. 06.2018 – Jenkins JEP-211 5. 09.2018 – Jenkins runs well on Java 11 RC (22 Sep) 6. 09.2018 – All known fixes to the core are upstreamed 26

Slide 27

Slide 27 text

© 2018 CloudBees, Inc. All Rights Reserved. Java 11 progress JEP-211 - JEP for Java support Preview in weekly Preview, feature branch GA in weekly GA in LTS We are here 27

Slide 28

Slide 28 text

© 2018 CloudBees, Inc. All Rights Reserved. How to run Jenkins with Java 11? Vanilla: > docker run -p 8080:8080 -p 50000:50000 jenkins/jenkins-experimental:latest-jdk11 With Pipeline and BlueOcean: > docker run -p 8080:8080 -p 50000:50000 jenkins/jenkins-experimental:blueocean-jdk11 More options: https://jenkins.io/blog/2018/06/17/running-jenkins-with-java10-11/ 28

Slide 29

Slide 29 text

© 2018 CloudBees, Inc. All Rights Reserved. Demo https://github.com/oleg-nenashev/demo-jenkins-config-a s-code/commits/java11-support 29

Slide 30

Slide 30 text

© 2018 CloudBees, Inc. All Rights Reserved. Obstacles

Slide 31

Slide 31 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins - one of the biggest JVM-based projects in the world 31

Slide 32

Slide 32 text

© 2018 All Rights Reserved. 32

Slide 33

Slide 33 text

© 2018 All Rights Reserved. 33 Jenkins • Automation Framework, [too] flexible • Architecture created before 2008 • Distributed Remote Execution Service • 1500+ plugins for any use-case • 10+ years of backward compatibility

Slide 34

Slide 34 text

© 2018 CloudBees, Inc. All Rights Reserved. © 2018 CloudBees, Inc. All Rights Reserved. Backend 34 ● In-house libraries ● Executable WAR files ● No class isolation

Slide 35

Slide 35 text

© 2018 CloudBees, Inc. All Rights Reserved. © 2018 CloudBees, Inc. All Rights Reserved. Legacy frontend 35 In Jenkins… it’s also Java ● Jetty ● External web containers ● Jelly/Groovy ● Stapler Work in progress: JavaScript and REST API

Slide 36

Slide 36 text

© 2018 CloudBees, Inc. All Rights Reserved. Off-topic: Shifting gears. Cloud Native Jenkins & Architecture Aug 31, 2018 – Kohsuke Kawaguchi, “Jenkins: Shifting Gears” https://jenkins.io/blog/2018/08/31/shifting-gears/ 36

Slide 37

Slide 37 text

© 2018 CloudBees, Inc. All Rights Reserved. 37 Lib 1 Lib 2 Lib 3 Plugin 1 Plugin 2 Plugin 3 Lib 4 Lib 5 Plugin 4

Slide 38

Slide 38 text

© 2018 CloudBees, Inc. All Rights Reserved. Plugin Dependencies 38

Slide 39

Slide 39 text

© 2018 CloudBees, Inc. All Rights Reserved. 39 Dependency updates ● A LOT of dependencies ● Low-level logic in plugins ○ JNA, JavaMelody, ...

Slide 40

Slide 40 text

© 2018 CloudBees, Inc. All Rights Reserved. 40 Dependency updates ● A LOT of dependencies ● Low-level logic in plugins ○ JNA, JavaMelody, ... ● No class isolation - risk of binary conflicts ● Major upgrades / breaking changes in recent versions ● JAR Hell

Slide 41

Slide 41 text

© 2018 CloudBees, Inc. All Rights Reserved. 41 Dependency updates Long tail of plugins ● Limited maintenance ● Already had fun with Jenkins JEP-200 (class deserialization whitelist)

Slide 42

Slide 42 text

© 2018 CloudBees, Inc. All Rights Reserved. Dependency updates • ASM 6 - bytecode Manipulations • Jetty - compatibility patches, TLS 1.3 • Groovy - Pipeline support • JBoss Marshalling - Pipeline support • JNR, JNA - illegal reflective access 42

Slide 43

Slide 43 text

© 2018 CloudBees, Inc. All Rights Reserved. ASM Upgrade ByteCode Transformer (Binary compatibility engine) • jenkinsci/bytecode-compatibility-transformer FileLeak Detector • kohsuke/file-leak-detector/ Pipeline: CPS Plugin 43

Slide 44

Slide 44 text

© 2018 CloudBees, Inc. All Rights Reserved. Dependencies. Groovy Updated from 2.4.8 to 2.4.9 ● Required for Declarative Pipeline ● Updates are tough in Jenkins ● Groovy scripting, Pipeline, Script Security, ... Groovy 3.x update??? 44

Slide 45

Slide 45 text

© 2018 CloudBees, Inc. All Rights Reserved. JBoss Marshalling • Context Persistency in Jenkins Pipeline • Major upgrade required • Data formats are not compatible. Upgradeability issues • First multi-release JAR, many tooling updates 45

Slide 46

Slide 46 text

© 2018 CloudBees, Inc. All Rights Reserved. Modules Expectations Image: https://www.kdnuggets.com/2016/10/big -data-science-expectation-reality.html

Slide 47

Slide 47 text

© 2018 CloudBees, Inc. All Rights Reserved. Modules Expectations Image: https://www.kdnuggets.com/2016/10/big -data-science-expectation-reality.html Reality

Slide 48

Slide 48 text

© 2018 CloudBees, Inc. All Rights Reserved. Modules. Classloading changes in Java 9+ ● http://java9.wtf/class-loading/ ● Restricted Bootstrap Class Loader (JEP-261) ● Impact: references to default classloaders ● Jenkins has a complex classloading logic ● Issue: Pipeline Utility Steps (javax.xml.soap.*) 48 new URLClassloader(null, ...)

Slide 49

Slide 49 text

© 2018 CloudBees, Inc. All Rights Reserved. Java 9+. Not longer visible in Default Classloader ● java.sql.* ● javax.activation.* ● javax.annotation.* ● javax.jws.* ● javax.lang.model.* ● javax.rmi.* ● javax.script.* ● javax.smartcardio.* 49 ● javax.sql.* ● javax.tools.* ● javax.transaction.xa.* ● javax.xml.bind.* ● javax.xml.crypto.* ● javax.xml.soap.* ● javax.xml.ws.*

Slide 50

Slide 50 text

© 2018 CloudBees, Inc. All Rights Reserved. JAXB • javax.xml.bind & Co • Widely used in plugins (query) • Detached from Java 9 to a module • Removed from Java 11 (JEP-320) 50

Slide 51

Slide 51 text

© 2018 CloudBees, Inc. All Rights Reserved. JAXB. Workarounds 51 Download the following libraries to the same directory as jenkins.war ● jaxb-api-2.3.0.jar (save as jaxb-api.jar) ● jaxb-core-2.3.0.1.jar (save as jaxb-core.jar) ● jaxb-impl-2.3.0.1.jar (save as jaxb-impl.jar) ● javax.activation v.1.2.0 (save as javax.activation.jar) Run: ${JAVA11_HOME}/bin/java \ -p jaxb-api.jar:javax.activation.jar --add-modules java.xml.bind,java.activation \ -cp jaxb-core.jar:jaxb-impl.jar \ -jar jenkins.war --enable-future-java --httpPort=8080 --prefix=/jenkins https://jenkins.io/blog/2018/06/17/running-jenkins-with-java10-11/

Slide 52

Slide 52 text

© 2018 CloudBees, Inc. All Rights Reserved. JAXB. Multi-release WAR? OpenJDK Jigsaw Team: No solution Option 1: Support conditional JAR extraction ● Jenkins Extras Executable WAR: ● https://github.com/jenkinsci/extras-executable-war/ Option 2: Bundle JAXB JAR files Option 3: Detaching to a plugin 52

Slide 53

Slide 53 text

© 2018 CloudBees, Inc. All Rights Reserved. CORBA Also removed from Java 11 (JEP-320) We do not use CORBA We have class deserialization tests depending on it 53

Slide 54

Slide 54 text

© 2018 CloudBees, Inc. All Rights Reserved. CORBA. No Multi-release Test JARs ☹ • Class Deserialization Attack Tests (SECURITY-218) • CORBA, JAXB • … • Solution: Detach tests to a separate Maven Module + profiles to skip them 54

Slide 55

Slide 55 text

© 2018 CloudBees, Inc. All Rights Reserved. Modules. REAL Adoption (JEP-261) Plugin => Module mapping Plugin isolation Classloading isolation

Slide 56

Slide 56 text

© 2018 CloudBees, Inc. All Rights Reserved. Illegal Reflective Access (JEP-260) TL;DR: setAccessible(true) in the code Was enforced in Java 9 EA, reverted (JEP-260) Query in GitHub: https://github.com/search?q=org%3Ajenkinsci+setAcce ssible%28true%29&type=Code 56

Slide 57

Slide 57 text

© 2018 CloudBees, Inc. All Rights Reserved. 57 ● Internal Libraries ● Upstream Dependencies ● Object serialization frameworks Escape hatch: “--illegal-access=permit” Illegal Reflective Access

Slide 58

Slide 58 text

© 2018 CloudBees, Inc. All Rights Reserved. 58 Java Web Start deprecated - Java 9 removed - Java 11 https://www.oracle.com/technetwork/j ava/eol-135779.html https://www.oracle.com/technetwork/j ava/javase/javaclientroadmapupdate 2018mar-4414431.pdf

Slide 59

Slide 59 text

© 2018 CloudBees, Inc. All Rights Reserved. Java Web Start in Jenkins UX: Used for Agent startup from Web UI 59 https://support.cloudbees.com/hc/en-us/articles/217423827-Ho w-to-Install-Several-Windows-Slaves-as-a-Service-

Slide 60

Slide 60 text

© 2018 CloudBees, Inc. All Rights Reserved. Java Web Start. Our Plan No industry-standard replacement so far Our plan: ● Update Documentation / Web UI ● Detach Java Web Start to a plugin 60

Slide 61

Slide 61 text

© 2018 CloudBees, Inc. All Rights Reserved. Packaging Docker & Co

Slide 62

Slide 62 text

© 2018 CloudBees, Inc. All Rights Reserved. 62

Slide 63

Slide 63 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins & Docker. Packaging https://hub.docker.com/r/jenkins/ AND https://hub.docker.com/r/jenkinsci 63

Slide 64

Slide 64 text

© 2018 CloudBees, Inc. All Rights Reserved. Docker Packaging Our base image: https://hub.docker.com/_/openjdk/ 64

Slide 65

Slide 65 text

© 2018 CloudBees, Inc. All Rights Reserved. Docker Packaging Our base image: https://hub.docker.com/_/openjdk/ 65 ● Maintained by Docker, not OpenJDK ● Lags behind the releases, esp. for EA ● No multi-platform support (Arm & Co) ● Unclear future post Jan 2019 ● Not recommended by the OpenJDK Jigsaw Team

Slide 66

Slide 66 text

© 2018 CloudBees, Inc. All Rights Reserved. Docker Packaging OpenJDK Jigsaw Team: ● Build OpenJDK on your own We consider: ● Build OpenJDK on your own ● AdoptOpenJDK packages 66

Slide 67

Slide 67 text

© 2018 CloudBees, Inc. All Rights Reserved. DockerHub flow ● Build on DockerHub for some components ● Dockerfile in the root ● Branches, branches, branches ● Separating build and packaging? 67 https://github.com/jenkinsci/docker-jnlp-slave

Slide 68

Slide 68 text

© 2018 CloudBees, Inc. All Rights Reserved. Development Tools and Java 11

Slide 69

Slide 69 text

© 2018 CloudBees, Inc. All Rights Reserved. Goal: Test with Java 11, not build with JDK 11

Slide 70

Slide 70 text

© 2018 CloudBees, Inc. All Rights Reserved. Goal: Test with Java 11, not build with JDK 11 ● Debugging with Java 11 ● No separation in development tools

Slide 71

Slide 71 text

© 2018 CloudBees, Inc. All Rights Reserved. First run with OpenJDK 11 71

Slide 72

Slide 72 text

© 2018 CloudBees, Inc. All Rights Reserved. Updates we needed. Upstream projects • Maven Compiler Plugin 3.8.0 • Animal Sniffer • Maven Enforcer & Rule plugins • Annotation Indexer / SezPoz • JaCoCo, Cobertura • Access Modifier • … 72

Slide 73

Slide 73 text

© 2018 CloudBees, Inc. All Rights Reserved. Updates we needed. Internal ● Plugin and Core Parent POMs ● Maven HPI Plugin ● Maven Jenkins Dev Plugin (jetty-maven-plugin fork) ● All test tools ○ Jenkins Test Harness (functional tests) ○ Acceptance Test Harness (UI, etc.) ○ Plugin Compatibility Tester ● ... 73

Slide 74

Slide 74 text

© 2018 CloudBees, Inc. All Rights Reserved. FindBugs ● We still use FindBugs ● Random build failures with Java 11 ○ JENKINS-53692, JENKINS-53720 ● FindBugs is R.I.P., right? Mitigation: ● Disabling failing rules for now 74

Slide 75

Slide 75 text

© 2018 CloudBees, Inc. All Rights Reserved. FindBugs workaround 75 https://github.com/jenkinsci/jenkins/blob/java11-support/src /findbugs/findbugs-excludes.xml#L13-L15 . . .

Slide 76

Slide 76 text

© 2018 CloudBees, Inc. All Rights Reserved. FindBugs => SpotBugs SpotBugs 3.1.8+ is JDK11-compatible ● spotbugs/spotbugs/issues/711 76

Slide 77

Slide 77 text

© 2018 CloudBees, Inc. All Rights Reserved. Javadoc issues ● Randomly fails in Docker builds (JENKINS-53788) ● OpenJDK Bug? Under triage 77 javadoc: error - An internal exception has occurred. (java.lang.AssertionError) Please file a bug against the javadoc tool via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include error messages and the following diagnostic in your report. Thank you. java.lang.AssertionError at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155) at jdk.compiler/com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:62) at jdk.compiler/com.sun.tools.javac.comp.Annotate.fromAnnotations(Annotate.java:167) at jdk.compiler/com.sun…..lambda$annotateTypeSecondStage$5(Annotate.java:1025) at jdk.compiler/com.sun.tools.javac.comp.Annotate.flush(Annotate.java:194) at ...

Slide 78

Slide 78 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins-on-Jenkins 78 ● Yes, we run CI/CD with Jenkins ● https://ci.jenkins.io/ ● Jenkins can build projects with JDK 11 while running with Java 8

Slide 79

Slide 79 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins-on-Jenkins ● Testing with Java 8 and 11 ● Testing on Linux and Windows ● Doubling the tests cost ● We got used to the Java 8-only world... 79

Slide 80

Slide 80 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins-on-Jenkins. Changes ● OpenJDK11 on tool infrastructure ● OpenJDK11 Docker images for agents ● OpenJDK11 Docker images for tools ● Pipeline Library: Java version as parameter ● Pipeline Library: Version matrix 80

Slide 81

Slide 81 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins-on-Jenkins. Demo 81 https://ci.jenkins.io/blue/organizatio ns/jenkins/Core%2Fjenkins/detail/j ava11-support/18/pipeline

Slide 82

Slide 82 text

© 2018 CloudBees, Inc. All Rights Reserved. Jenkins & Java 11 Current Status

Slide 83

Slide 83 text

© 2018 CloudBees, Inc. All Rights Reserved. Current state JEP-211 - JEP for Java support All functional patches are in Jenkins Weekly 83 Preview in weekly Preview, feature branch GA in weekly GA in LTS We are here

Slide 84

Slide 84 text

© 2018 CloudBees, Inc. All Rights Reserved. Preview in Weekly. Blockers “Pipeline: Support” release to enable Pipeline JBoss Marshalling update caused regressions Needs investigation/fix 84

Slide 85

Slide 85 text

© 2018 CloudBees, Inc. All Rights Reserved. Preview in Weekly. Blockers “Pipeline: Support” release to enable Pipeline JBoss Marshalling update caused regressions Needs investigation/fix Official Docker packaging for masters/agents 85

Slide 86

Slide 86 text

© 2018 CloudBees, Inc. All Rights Reserved. Preview in Weekly. Blockers “Pipeline: Support” release to enable Pipeline JBoss Marshalling update caused regressions Needs investigation/fix Official Docker packaging for masters/agents CI flow for Java 11 JTH - almost done ATH - work-in-progress PCT - not started 86

Slide 87

Slide 87 text

© 2018 CloudBees, Inc. All Rights Reserved. Post-GA. Java 11 • Java 11 maintenance (special team) • Cleanup of Illegal Reflective Access and technical debt • Jenkins X (serverless) • Jenkins Evergreen • … 87

Slide 88

Slide 88 text

© 2018 CloudBees, Inc. All Rights Reserved. Post-GA. Java 12+ Jenkins is a part of Quality Outreach • https://wiki.openjdk.java.net/display/quality/Quality+Outreach Enabling testing early is critical for projects More breaking changes are coming ● sun.misc.Signal deprecation ● Illegal Reflective Access enforcement? 88

Slide 89

Slide 89 text

© 2018 CloudBees, Inc. All Rights Reserved. Java 11. Where can you help? 1. Feedback is needed! https://jenkins.io/blog/2018/06/17/running-jenkins-with-java10-11/ 2. Test your projects/plugins with Java 11 3. Lots of “minor” fixes/improvements (see JENKINS-40689) 89

Slide 90

Slide 90 text

© 2018 CloudBees, Inc. All Rights Reserved. Java Expert? Join the Jenkins Platform SIG! https://jenkins.io/sigs/platform/ 90 Jenkins needs you!

Slide 91

Slide 91 text

© 2018 CloudBees, Inc. All Rights Reserved. What is platform SIG? 20+ members, regular meetings ● Java support. Java != OpenJDK ● Operating Systems & Architectures ● Jenkins packaging 91

Slide 92

Slide 92 text

© 2018 CloudBees, Inc. All Rights Reserved. Summary

Slide 93

Slide 93 text

© 2018 CloudBees, Inc. All Rights Reserved. Java 11 adoption ● Was a lot easier than we expected ● Java 8 => 10. PoC in 2 days ● Java 10 => 11. PoC in 1 day ● Multiply by 10+ for upstreaming changes ○ Productization overheads ○ Ensuring compatibility ○ Build/test automation 93

Slide 94

Slide 94 text

© 2018 CloudBees, Inc. All Rights Reserved. What’s missing? ● Java 11 compatibility scanners for Maven Dependencies ● Maven Plugins are still behind, it’s getting better ● Tools for Java 11 and JavaEE (multi-release WARs, JAXB, etc.) 94

Slide 95

Slide 95 text

© 2018 CloudBees, Inc. All Rights Reserved. Takeaways ● Java 11 is here to stay ● Java release cycles speedup ● Start working towards Java 11 upgrades now ● Migrate from Oracle JDK if you use it as Freemium ○ OpenJDK if you target latest versions ○ AdoptOpenJDK ○ Other packages 95

Slide 96

Slide 96 text

© 2018 CloudBees, Inc. All Rights Reserved. Useful links. Jenkins Platform SIG ● https://jenkins.io/sigs/platform/ JEP-211: Java 11 support in Jenkins ● https://github.com/jenkinsci/jep/tree/master/jep/211 Running with Java 11: ● https://jenkins.io/blog/2018/06/17/running-jenkins-with-java10-11/ My demo: ● https://github.com/oleg-nenashev/demo-jenkins-config-as-code/tree /java11-support 96

Slide 97

Slide 97 text

© 2018 CloudBees, Inc. All Rights Reserved. Useful links. Java 9, 10, 11, … JEPs and Oracle articles in the slides Release notes for Java 9..11 (deprecations, etc.) Leonardo Zanivan, “It’s time! Migrating to Java 11” ● https://medium.com/criciumadev/its-time-migrating-to-java-11-5eb3868354f9 Stephen Colebourne, “Oracle's Java 11 trap - Use OpenJDK instead!” ● https://blog.joda.org/2018/09/do-not-fall-into-oracles-java-11-trap.html Nicolai Parlog ● http://java9.wtf/ 97

Slide 98

Slide 98 text

© 2018 CloudBees, Inc. All Rights Reserved. Contacts: E-mail: onenashev@cloudbees.com GitHub: oleg-nenashev Twitter: @oleg_nenashev QUESTIONS? go.cloudbees.com 98