Abstract image of a woman sitting on books and studying on a laptop

Making The Move To Java 17 (JConf 2022)

A
Alex Motley

The document provides comprehensive guidance on migrating to Java 17, highlighting new features, migration challenges, and strategies for easing the transition. It outlines significant updates in Java 11 through 17, discusses deprecated features, and offers tools for assessing and resolving migration issues. Additionally, it emphasizes the importance of upgrading dependencies and offers a structured approach to evaluating and testing applications for compatibility with Java 17.

Software
1 of 41
Download to read offline
1
2
3
Most read
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Most read
37
38
Most read
39
40
41
MAKING THE MOVE TO JAVA 17 ALEX MOTLEY @alexsmotley CINDY HIGH @CTHigh
ABOUT US Alex Motley Alex is a software engineer at IBM leading the WebSphere Application Server migration tools team. His team develops several migration tools to help with a variety of modernization scenarios including WebSphere traditional to Liberty, Java SE and EE versions, and on-premise to cloud. He has almost a decade of experience working with Java EE and Java application server technology. Alex enjoys hiking and skiing and lives in Rochester, MN. Cindy High Cindy is a software engineer with IBM and is the WebSphere Application Server migration tools architect focusing on application modernization and configuration migration. She has worked over 20 years with Java EE and application server technology. The tools we developed over the years for WebSphere can help you migrate your applications easier! Cindy enjoys biking and working on stained glass projects and lives in Raleigh, NC.
MAKING THE MOVE TO JAVA 17 WHY MIGRATE?
WHY MIGRATE? Lots of new features! Feature Lists ( JDK 11, JDK 12, JDK 13, JDK 14, JDK 15, JDK 16, JDK 17)
WHY MIGRATE? - NEW JAVA 11 FEATURES § var for local variables (JEP 286) § New methods in classes (Collection, etc) (JEP 269) - List<String> myList = ArrayList<String>(); - myList.add(“Georgia”); - myList.add(“Minnesota”); - myList.add(“Texas”); - myList = Collections.unmodifiableList(myList); + var myList = List.of(“Georgia”, “Minnesota”, “Texas”);
WHY MIGRATE? - NEW JAVA 17 FEATURES Text Blocks (JEP 378) - String output = "Now you can moren" + - "easily write Stringsn" + - "that span multiple lines."; + String output = """ + Now you can more + easily write Strings + that span multiple lines.""";
WHY MIGRATE? - NEW JAVA 17 FEATURES Helpful NullPointerExceptions (JEP 358) - Exception in thread "main" java.lang.NullPointerException - at ... + Exception in thread "main" java.lang.NullPointerException: + Cannot invoke "String.concat(String)" because "MyClass.coffee" + is null + at ...
WHY MIGRATE? - NEW JAVA 17 FEATURES Records (JEP 395) - public class Car { - private final String color; - private final String make; - private final String model; - - public Car(String color, String make, String model) { - this.color = color; - this.make = make; - this.model = model; - } - - // Getters for color, make, model - // equals, toString, and hashCode methods - } + public record Car (String color, String make, String model) {}
WHY MIGRATE? - NEW JAVA 17 FEATURES Switch enhancements (JEP 361, JEP 406) - String result = ""; - switch (day) { - case MONDAY: - case TUESDAY: - case WEDNESDAY: - case THURSDAY: - case FRIDAY: - result = "Weekday"; - break; - case SATURDAY: - case SUNDAY: - result = "Weekend"; - break; - default: - throw new IllegalStateException("Unknown day: " + day); - } + var result = switch (day) { + case MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY -> "Weekday"; + case SATURDAY, SUNDAY -> "Weekend"; + default -> throw new IllegalStateException("Unknown day: " + day); + };
WHY MIGRATE? - NEW JAVA 17 FEATURES § instanceof Pattern Matching (JEP 394) - if (sport instanceof Baseball) { - Baseball baseball = (Baseball) sport; - baseball.pitch(); - } + if (sport instanceof Baseball baseball) { + baseball.pitch(); + }
WHY MIGRATE? Security Related Changes ¡ Crypto ¡ With Applet support removed, Security Manager deprecated for removal ¡ Strongly Encapsulated JDK Internals (JEP 403) ¡ Sealed classes (JEP 409) ¡ Hidden classes (JEP 371)
WHY MIGRATE? Library/tooling developers need to keep up
WHY MIGRATE? …and of course: Java 8 and 11 will EOL
MAKING THE MOVE TO JAVA 17 WHAT IS MY TARGET JAVA VERSION?
JAVA TIMELINE Java 11 (LTS) Sept 2018 LTS: Long Term Support - Production 2016 2017 2018 2019 2021 2020 2022 2023 2024 2025 Java 9 Java 10 Java 12 Java 13 Java 14 Java 15 Java 16 Java 7 Sept 2021 Java 18 Java 19 Java 20 Sept 2023 Continuous testing with non-LTS releases Java 17 (LTS) 2027 Java 21 (LTS) Java 8 (LTS) 2026
MAKING THE MOVE TO JAVA 17 WHAT ARE THE TOP MIGRATION ISSUES FOR JAVA 8/11 à JAVA 17+?
Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
java.activation javax.activation java.corba javax.rmi javax.rmi.CORBA org.omg.CORBA org.omg.CORBA_2_3 org.omg.CORBA_2_3.portable ... org.omg.PortableServer org.omg.PortableServer.* org.omg.SendingContext org.omg.stub.java.rmi java.transaction javax.transaction java.xml.bind javax.xml.bind javax.xml.bind.annotation javax.xml.bind.annotation.adapte javax.xml.bind.attachment javax.xml.bind.helpers javax.xml.bind.util java.xml.ws javax.jws javax.jws.soap javax.xml.soap javax.xml.ws javax.xml.ws.handler javax.xml.ws.handler.soap javax.xml.ws.http javax.xml.ws.soap javax.xml.ws.spi javax.xml.ws.spi.http javax.xml.ws.wsaddressing java.xml.ws.annotation javax.annotation Java 11+ (Java EE) (Most problematic for us) Option 1: Package your own dependencies Option 2: Rely on the app server to provide them (Open Liberty with Java 11+) JAX-B JAX-WS Common Annotations JTA Corba JAF
JAVA 11 + Java Web Start github.com/openjdk/nashorn JavaFX openwebstart.com openjfx.io JAVA 17 + Nashorn JavaScript Engine
Java 11+: Java EE (Checkout jakarta.ee)
Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
JAVA 11 § com.sun.awt.AWTUtilities § com.sun.image.codec.jpeg.* § com.sun.java.browser.plugin2.DOM § com.sun.security.auth.callback.DialogCallbackHandler § com.sun.security.auth.module.SolarisLoginModule § com.sun.security.auth.module.SolarisSystem § com.sun.security.auth.PolicyFile § com.sun.security.auth.SolarisNumericGroupPrincipal § com.sun.security.auth.SolarisNumericUserPrincipal § com.sun.security.auth.SolarisPrincipal § com.sun.security.auth.X500Principal Removed Packages/Classes - com.sun.security.auth.SolarisNumericGroupPrincipal principal + com.sun.security.auth.UnixNumericGroupPrincipal principal
JAVA 11 § com.sun.xml.internal.bind.* § java.awt.dnd.peer.* § java.awt.peer.* § javax.security.auth.Policy § sun.misc.BASE64Decoder § sun.misc.BASE64Encoder § sun.misc.Unsafe.defineClass § sun.plugin.dom.DOMObject Removed Packages/Classes - if(button.getPeer() != null) { + if(button.isDisplayable()) {
JAVA 11 § java.lang.Runtime.getLocalizedInputStream(..) § java.lang.Runtime.getLocalizedOutputStream(..) § java.lang.Runtime.runFinalizersOnExit(..) § java.lang.SecurityManager.checkAwtEventQueueAccess() § java.lang.SecurityManager.checkMemberAccess(..) § java.lang.SecurityManager.checkSystemClipboardAccess() § java.lang.SecurityManager.checkTopLevelWindow(..) § java.lang.SecurityManager.classDepth(..) § java.lang.SecurityManager.classLoaderDepth() § java.lang.SecurityManager.currentClassLoader() § java.lang.SecurityManager.currentLoadedClass() § java.lang.SecurityManager.getInCheck() § java.lang.SecurityManager.inClass(..) § java.lang.SecurityManager.inClassLoader() Removed Methods - securityManager.checkAwtEventQueueAccess(); + securityManager.checkPermission(permission);
JAVA 11 § java.lang.System.runFinalizersOnExit(..) § java.lang.Thread.destroy() § java.lang.Thread.stop(java.lang.Throwable) § java.util.jar.Pack200.Packer.addPropertyChangeListener(..) § java.util.jar.Pack200.Packer.removePropertyChangeListener(..) § java.util.jar.Pack200.Unpacker.addPropertyChangeListener(..) § java.util.jar.Pack200.Unpacker.removePropertyChangeListener(..) § java.util.logging.LogManager.addPropertyChangeListener(..) § java.util.logging.LogManager.removePropertyChangeListener(..) Removed Methods “Finalizers are inherently problematic, and their use can lead to performance issues, deadlocks, hangs, and other problematic behavior.” - JDK-8165641
JAVA 17 § com.sun.awt.SecurityWarning § java.security.acl.* § java.util.jar.Pack200* § jdk.net.SocketFlow* § java.rmi.activation* Removed Packages/Classes § java.management.rmi.RMIConnectorServer.CREDENTIAL_TYPES Removed Constants
JAVA 17 § java.io.FileInputStream.finalize() § java.io.FileOutputStream.finalize() § java.lang.Runtime.traceInstructions(boolean) § java.lang.Runtime.traceMethodCalls(boolean) § java.util.zip.ZipFile.finalize() § java.util.zip.Inflater.finalize() § java.util.zip.Deflater.finalize() § netscape.javascript.JSObject.getWindow(Applet) § sun.misc.Unsafe.defineAnonymousClass(Class<?> hostClass, byte[] data, Object[] cpPatches) § javax.net.ssl.SSLSession.getPeerCertificateChain()** § java.lang.thread.countStackFrames()** Removed Methods § javax.tools.ToolProvider() § java.lang.invoke.ConstantBootstraps() § java.lang.relect.Modifier() Removed Constructors **APIs now throw UnsupportedOperationException - javax.net.ssl.SSLSession.getPeerCerficateChain(); + javax.net.ssl.SSLSession.getPeerCerficates();
Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
§ Breaks code into modules containing packages § Applications must declare dependency on modules for access § Disruptive for Java SE application migrations Java Platform Module System (JPMS) § Use JDeps or --illegal-access=warn|debug Use find issues in your application § Use --illegal-access=permit If migrating to Java 11 § --add-opens launcher option § Add-Opens jar Manifest Attribute If migrating to Java 17+ MODULARITY
Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
OUT-OF-DATE DEPENDENCIES Libraries (ASM, Mockito, Spring, Spring Boot, etc) Build Tools (Maven, Gradle, etc) IDE (Eclipse, IntelliJ, VS Code, etc) Application servers (Open Liberty, JBoss, WebLogic, etc) My advice: take this time to upgrade your dependencies to the latest supported version. Setup automation tools.
MAKING THE MOVE TO JAVA 17 WHAT ABOUT DEPRECATIONS?
KEEP AN EYE ON DEPRECATIONS § Java RMI Activation § Thread.destroy() and Thread.stop(Throwable t) Some recently removed deprecations include: § Java Security Manager § Primitive wrapper class constructors Some APIs currently deprecated for removal: Full list: https://docs.oracle.com/en/java/javase/17/docs/api/deprecated-list.html#for-removal
MAKING THE MOVE TO JAVA 17 WHAT TOOLS CAN I USE TO MAKE MY MIGRATION EASIER?
USE CONTAINERS TO STAY UP TO DATE ¡ Use containers to easily keep your Java versions up to date ¡ This can be used to ensure you stay up to date with the latest fix packs, as well as test out new Java versions
Application Binary Scanner Tool § Download: ibm.biz/WAMT4AppBi naries or Maven § Command line tool (free personal and commercial use) § Scans an application binary for migration issues and produces a report with identified problems, solutions and resource links § Documentation JDeps § Command utility shipped with JDK (run with the target Java version – Java 11+) § Migration Relevant Option: -jdkinternals § Binary scanner will recommend running JDeps if it identifies internal APIs § Documentation Tools to automate dependency updates (various options) § Use an auto-upgrade dependency tool to keep your dependencies up-to- date § Configure the tools to update based on various settings (frequency, etc) § Example: Dependabot Eclipse Transformer § Transform application binaries or source code to use the new package names in Jakarta EE 9+ § Documentation TOOLS
DEMO
NEXT STEPS Step 1 Evaluate your applications using the tools. Step 2 Try running your application on Java 17. If your app runs successfully, you can skip the next two steps. Step 3 Debug and fix your application code or build files. Repeat steps 1-3. Step 4 Update your dependencies and tools as needed. Step 5 Run all your application tests. Step 6 Celebrate!
HELPFUL LINKS ¡ Our blog on adding the Java 17 feature to the migration tools (written instructions on running binary scanner): https://developer.ibm.com/tutorials/migration-to-java-11-made-easy/ ¡ Binary Scanner and Eclipse IDE Plugin Source Scanner downloads: ibm.biz/wamtdownloads § Documentation: https://www.ibm.com/docs/wamt ¡ Link to the java17demo GitHub repo: https://github.com/alexsm82/java17demo ¡ Oracle Java SE Support Roadmap: https://www.oracle.com/java/technologies/java-se-support- roadmap.html ¡ Java Version Almanac: https://javaalmanac.io/ ¡ Andy Guibert’s blog on OpenLiberty Java 11+ support: https://openliberty.io/blog/2019/02/06/java- 11.html ¡ Blog on running the binary scanner with Maven: https://community.ibm.com/community/user/wasdevops/blogs/alex- motley1/2022/04/12/applications-pipelines-and-migrations
IBM SESSIONS ¡ Tuesday 10:00AM Fast JVM Startup with Checkpoint and Restore – Tobi Ajila | JVM Platform ¡ Tuesday 2:15PM Better, Stronger, Faster Java in the Cloud - Jarek Gawor and Tobi Ajila |Main Room (Java) ¡ 3:15 Book signing – Cloud Native Application Development with MicroProfile and Open Liberty and Birthday Cake ¡ Wednesday 10:00AM Making the Move to Java 17 – Alex Motley and Cindy High | Main Room (Java) ¡ Wednesday 1:15PM Relook at Microservices – Emily Jiang | Main Room (Java)
QUESTIONS? @alexsmotley @CTHigh

More Related Content

PDF
Deep Dive Java 17 Devoxx UK
José Paumard
 
PPTX
Discover Quarkus and GraalVM
Romain Schlick
 
PDF
Spring Boot 3 And Beyond
VMware Tanzu
 
PDF
Quarkus - a next-generation Kubernetes Native Java framework
SVDevOps
 
PDF
From Java 11 to 17 and beyond.pdf
José Paumard
 
PDF
Spring Boot Interview Questions PDF By ScholarHat
Scholarhat
 
PDF
Case Study: Migrating Hyperic from EJB to Spring from JBoss to Apache Tomcat
VMware Hyperic
 
PDF
JavaOne 2013: Memory Efficient Java
Chris Bailey
 
Deep Dive Java 17 Devoxx UK
José Paumard
 
Discover Quarkus and GraalVM
Romain Schlick
 
Spring Boot 3 And Beyond
VMware Tanzu
 
Quarkus - a next-generation Kubernetes Native Java framework
SVDevOps
 
From Java 11 to 17 and beyond.pdf
José Paumard
 
Spring Boot Interview Questions PDF By ScholarHat
Scholarhat
 
Case Study: Migrating Hyperic from EJB to Spring from JBoss to Apache Tomcat
VMware Hyperic
 
JavaOne 2013: Memory Efficient Java
Chris Bailey
 

What's hot (20)

ODP
Java 9 Features
NexThoughts Technologies
 
PPTX
Java Spring Framework
Mehul Jariwala
 
PPT
Spring Boot in Action
Alex Movila
 
PPTX
Spring boot
Pradeep Shanmugam
 
PPTX
What's new in Java 11
Michel Schudel
 
PDF
spring-api-rest.pdf
Jaouad Assabbour
 
PDF
Service discovery with Eureka and Spring Cloud
Marcelo Serpa
 
PDF
Spring Data JPA
Cheng Ta Yeh
 
PDF
Testing with JUnit 5 and Spring
VMware Tanzu
 
PDF
Java11 New Features
Haim Michael
 
PDF
Understanding MicroSERVICE Architecture with Java & Spring Boot
Kashif Ali Siddiqui
 
PDF
Spring core module
Raj Tomar
 
PDF
Introduction to Java 11
Knoldus Inc.
 
PPTX
Introduce yourself to java 17
ankitbhandari32
 
PPTX
Reactive programming
SUDIP GHOSH
 
PDF
Zeppelin(제플린) 서울시립대학교 데이터 마이닝연구실 활용사례
Taejun Kim
 
PDF
Upgrade to java 16 or 17
Johan Janssen
 
PDF
Spring boot jpa
Hamid Ghorbani
 
PPTX
Java 11 to 17 : What's new !?
Jérôme Tamborini
 
PDF
Spring Framework - Core
Dzmitry Naskou
 
Java 9 Features
NexThoughts Technologies
 
Java Spring Framework
Mehul Jariwala
 
Spring Boot in Action
Alex Movila
 
Spring boot
Pradeep Shanmugam
 
What's new in Java 11
Michel Schudel
 
spring-api-rest.pdf
Jaouad Assabbour
 
Service discovery with Eureka and Spring Cloud
Marcelo Serpa
 
Spring Data JPA
Cheng Ta Yeh
 
Testing with JUnit 5 and Spring
VMware Tanzu
 
Java11 New Features
Haim Michael
 
Understanding MicroSERVICE Architecture with Java & Spring Boot
Kashif Ali Siddiqui
 
Spring core module
Raj Tomar
 
Introduction to Java 11
Knoldus Inc.
 
Introduce yourself to java 17
ankitbhandari32
 
Reactive programming
SUDIP GHOSH
 
Zeppelin(제플린) 서울시립대학교 데이터 마이닝연구실 활용사례
Taejun Kim
 
Upgrade to java 16 or 17
Johan Janssen
 
Spring boot jpa
Hamid Ghorbani
 
Java 11 to 17 : What's new !?
Jérôme Tamborini
 
Spring Framework - Core
Dzmitry Naskou
 
Ad

Similar to Making The Move To Java 17 (JConf 2022) (20)

PPTX
Modern_Java_Workshop manjunath np hj slave
gangadharnp111
 
PPTX
Modern Java Workshop
Simon Ritter
 
PPTX
Getting the Most From Modern Java
Simon Ritter
 
PPT
Java user group 2015 02-09-java8
Marc Tritschler
 
PPT
Java user group 2015 02-09-java8
marctritschler
 
PDF
Migrate Early, Migrate Often: JDK release cadence strategies
DanHeidinga
 
PDF
Java features. Java 8, 9, 10, 11
Ivelin Yanev
 
PPTX
Java 7 & 8 New Features
Leandro Coutinho
 
PDF
Migrating Beyond Java 8
DaliaAboSheasha
 
PPTX
Keeping Up with Java: Look at All These New Features!
VMware Tanzu
 
PPTX
core_java_50_slides_thread_collections_p
mainakbhattacharya20
 
PDF
engage 2016 - Get ready for moving from Java 6 to Java 8 - Now!
René Winkelmeyer
 
PDF
Java 17
Mutlu Okuducu
 
PDF
Jakarta EE 8 on JDK17
Rudy De Busscher
 
PDF
Alive and Well with Java 8
Adam Pelsoczi
 
PDF
Migrating Beyond Java 8
DaliaAboSheasha
 
PPT
Jug java7
Dmitry Buzdin
 
PPT
Java SE 7 New Features and Enhancements
Fu Cheng
 
PDF
Terence Barr - jdk7+8 - 24mai2011
Agora Group
 
PDF
What to expect from Java 9
Ivan Krylov
 
Modern_Java_Workshop manjunath np hj slave
gangadharnp111
 
Modern Java Workshop
Simon Ritter
 
Getting the Most From Modern Java
Simon Ritter
 
Java user group 2015 02-09-java8
Marc Tritschler
 
Java user group 2015 02-09-java8
marctritschler
 
Migrate Early, Migrate Often: JDK release cadence strategies
DanHeidinga
 
Java features. Java 8, 9, 10, 11
Ivelin Yanev
 
Java 7 & 8 New Features
Leandro Coutinho
 
Migrating Beyond Java 8
DaliaAboSheasha
 
Keeping Up with Java: Look at All These New Features!
VMware Tanzu
 
core_java_50_slides_thread_collections_p
mainakbhattacharya20
 
engage 2016 - Get ready for moving from Java 6 to Java 8 - Now!
René Winkelmeyer
 
Java 17
Mutlu Okuducu
 
Jakarta EE 8 on JDK17
Rudy De Busscher
 
Alive and Well with Java 8
Adam Pelsoczi
 
Migrating Beyond Java 8
DaliaAboSheasha
 
Jug java7
Dmitry Buzdin
 
Java SE 7 New Features and Enhancements
Fu Cheng
 
Terence Barr - jdk7+8 - 24mai2011
Agora Group
 
What to expect from Java 9
Ivan Krylov
 
Ad

Recently uploaded (20)

PDF
Topaz Photo AI Crack New Download (Latest 2025)
hashmi66g66
 
PPTX
AMADEUS TRAVEL AGENT SOFTWARE | AMADEUS TICKETING SYSTEM
philipnathen82
 
PPTX
GSA Content Generator Crack (2025 Latest)
halimaanam8
 
DOCX
How to Use SharePoint as an ISO-Compliant Document Management System
Sharepoint Designs
 
PPTX
Cybersecurity: Protecting the Digital World
SURULIAPPANPREMKMAR
 
PPTX
Monitoring Stack: Grafana, Loki & Promtail
GhanshyamSwami3
 
PDF
Time Tracking Features That Teams and Organizations Actually Need
Orangescrum
 
PDF
Website Design Services for Small Businesses.pdf
ecomme9
 
PPTX
assetexplorer- product-overview - presentation
nonameist3434
 
PDF
AI/ML Infra Meetup | LLM Agents and Implementation Challenges
Alluxio, Inc.
 
PDF
MCP Security Tutorial - Beginner to Advanced
Harish Ramadoss
 
PDF
Types of Token_ From Utility to Security.pdf
Herond Labs
 
PDF
Wondershare Recoverit Full Crack New Version (Latest 2025)
hashmi66g66
 
PDF
iTop VPN Crack Latest Version Full Key 2025
hashmianya37
 
PDF
DNT Brochure 2025 – ISV Solutions @ D365
sai vignesh
 
PPTX
Computer Software - Technology and Livelihood Education
ShielaGuevarra6
 
PPTX
Computer Software and OS of computer science of grade 11.pptx
GauravDahal9
 
PPTX
Why Generative AI is the Future of Content, Code & Creativity?
Webuters Technologies Pvt. Ltd
 
PDF
How to Make Money in the Metaverse_ Top Strategies for Beginners.pdf
Herond Labs
 
PPTX
CNN LeNet5 Architecture: Neural Networks
DrRPonnusamyCIT
 
Topaz Photo AI Crack New Download (Latest 2025)
hashmi66g66
 
AMADEUS TRAVEL AGENT SOFTWARE | AMADEUS TICKETING SYSTEM
philipnathen82
 
GSA Content Generator Crack (2025 Latest)
halimaanam8
 
How to Use SharePoint as an ISO-Compliant Document Management System
Sharepoint Designs
 
Cybersecurity: Protecting the Digital World
SURULIAPPANPREMKMAR
 
Monitoring Stack: Grafana, Loki & Promtail
GhanshyamSwami3
 
Time Tracking Features That Teams and Organizations Actually Need
Orangescrum
 
Website Design Services for Small Businesses.pdf
ecomme9
 
assetexplorer- product-overview - presentation
nonameist3434
 
AI/ML Infra Meetup | LLM Agents and Implementation Challenges
Alluxio, Inc.
 
MCP Security Tutorial - Beginner to Advanced
Harish Ramadoss
 
Types of Token_ From Utility to Security.pdf
Herond Labs
 
Wondershare Recoverit Full Crack New Version (Latest 2025)
hashmi66g66
 
iTop VPN Crack Latest Version Full Key 2025
hashmianya37
 
DNT Brochure 2025 – ISV Solutions @ D365
sai vignesh
 
Computer Software - Technology and Livelihood Education
ShielaGuevarra6
 
Computer Software and OS of computer science of grade 11.pptx
GauravDahal9
 
Why Generative AI is the Future of Content, Code & Creativity?
Webuters Technologies Pvt. Ltd
 
How to Make Money in the Metaverse_ Top Strategies for Beginners.pdf
Herond Labs
 
CNN LeNet5 Architecture: Neural Networks
DrRPonnusamyCIT
 

Making The Move To Java 17 (JConf 2022)

  • 1. MAKING THE MOVE TO JAVA 17 ALEX MOTLEY @alexsmotley CINDY HIGH @CTHigh
  • 2. ABOUT US Alex Motley Alex is a software engineer at IBM leading the WebSphere Application Server migration tools team. His team develops several migration tools to help with a variety of modernization scenarios including WebSphere traditional to Liberty, Java SE and EE versions, and on-premise to cloud. He has almost a decade of experience working with Java EE and Java application server technology. Alex enjoys hiking and skiing and lives in Rochester, MN. Cindy High Cindy is a software engineer with IBM and is the WebSphere Application Server migration tools architect focusing on application modernization and configuration migration. She has worked over 20 years with Java EE and application server technology. The tools we developed over the years for WebSphere can help you migrate your applications easier! Cindy enjoys biking and working on stained glass projects and lives in Raleigh, NC.
  • 3. MAKING THE MOVE TO JAVA 17 WHY MIGRATE?
  • 4. WHY MIGRATE? Lots of new features! Feature Lists ( JDK 11, JDK 12, JDK 13, JDK 14, JDK 15, JDK 16, JDK 17)
  • 5. WHY MIGRATE? - NEW JAVA 11 FEATURES § var for local variables (JEP 286) § New methods in classes (Collection, etc) (JEP 269) - List<String> myList = ArrayList<String>(); - myList.add(“Georgia”); - myList.add(“Minnesota”); - myList.add(“Texas”); - myList = Collections.unmodifiableList(myList); + var myList = List.of(“Georgia”, “Minnesota”, “Texas”);
  • 6. WHY MIGRATE? - NEW JAVA 17 FEATURES Text Blocks (JEP 378) - String output = "Now you can moren" + - "easily write Stringsn" + - "that span multiple lines."; + String output = """ + Now you can more + easily write Strings + that span multiple lines.""";
  • 7. WHY MIGRATE? - NEW JAVA 17 FEATURES Helpful NullPointerExceptions (JEP 358) - Exception in thread "main" java.lang.NullPointerException - at ... + Exception in thread "main" java.lang.NullPointerException: + Cannot invoke "String.concat(String)" because "MyClass.coffee" + is null + at ...
  • 8. WHY MIGRATE? - NEW JAVA 17 FEATURES Records (JEP 395) - public class Car { - private final String color; - private final String make; - private final String model; - - public Car(String color, String make, String model) { - this.color = color; - this.make = make; - this.model = model; - } - - // Getters for color, make, model - // equals, toString, and hashCode methods - } + public record Car (String color, String make, String model) {}
  • 9. WHY MIGRATE? - NEW JAVA 17 FEATURES Switch enhancements (JEP 361, JEP 406) - String result = ""; - switch (day) { - case MONDAY: - case TUESDAY: - case WEDNESDAY: - case THURSDAY: - case FRIDAY: - result = "Weekday"; - break; - case SATURDAY: - case SUNDAY: - result = "Weekend"; - break; - default: - throw new IllegalStateException("Unknown day: " + day); - } + var result = switch (day) { + case MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY -> "Weekday"; + case SATURDAY, SUNDAY -> "Weekend"; + default -> throw new IllegalStateException("Unknown day: " + day); + };
  • 10. WHY MIGRATE? - NEW JAVA 17 FEATURES § instanceof Pattern Matching (JEP 394) - if (sport instanceof Baseball) { - Baseball baseball = (Baseball) sport; - baseball.pitch(); - } + if (sport instanceof Baseball baseball) { + baseball.pitch(); + }
  • 11. WHY MIGRATE? Security Related Changes ¡ Crypto ¡ With Applet support removed, Security Manager deprecated for removal ¡ Strongly Encapsulated JDK Internals (JEP 403) ¡ Sealed classes (JEP 409) ¡ Hidden classes (JEP 371)
  • 13. WHY MIGRATE? …and of course: Java 8 and 11 will EOL
  • 14. MAKING THE MOVE TO JAVA 17 WHAT IS MY TARGET JAVA VERSION?
  • 15. JAVA TIMELINE Java 11 (LTS) Sept 2018 LTS: Long Term Support - Production 2016 2017 2018 2019 2021 2020 2022 2023 2024 2025 Java 9 Java 10 Java 12 Java 13 Java 14 Java 15 Java 16 Java 7 Sept 2021 Java 18 Java 19 Java 20 Sept 2023 Continuous testing with non-LTS releases Java 17 (LTS) 2027 Java 21 (LTS) Java 8 (LTS) 2026
  • 16. MAKING THE MOVE TO JAVA 17 WHAT ARE THE TOP MIGRATION ISSUES FOR JAVA 8/11 à JAVA 17+?
  • 17. Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
  • 18. java.activation javax.activation java.corba javax.rmi javax.rmi.CORBA org.omg.CORBA org.omg.CORBA_2_3 org.omg.CORBA_2_3.portable ... org.omg.PortableServer org.omg.PortableServer.* org.omg.SendingContext org.omg.stub.java.rmi java.transaction javax.transaction java.xml.bind javax.xml.bind javax.xml.bind.annotation javax.xml.bind.annotation.adapte javax.xml.bind.attachment javax.xml.bind.helpers javax.xml.bind.util java.xml.ws javax.jws javax.jws.soap javax.xml.soap javax.xml.ws javax.xml.ws.handler javax.xml.ws.handler.soap javax.xml.ws.http javax.xml.ws.soap javax.xml.ws.spi javax.xml.ws.spi.http javax.xml.ws.wsaddressing java.xml.ws.annotation javax.annotation Java 11+ (Java EE) (Most problematic for us) Option 1: Package your own dependencies Option 2: Rely on the app server to provide them (Open Liberty with Java 11+) JAX-B JAX-WS Common Annotations JTA Corba JAF
  • 19. JAVA 11 + Java Web Start github.com/openjdk/nashorn JavaFX openwebstart.com openjfx.io JAVA 17 + Nashorn JavaScript Engine
  • 20. Java 11+: Java EE (Checkout jakarta.ee)
  • 21. Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
  • 22. JAVA 11 § com.sun.awt.AWTUtilities § com.sun.image.codec.jpeg.* § com.sun.java.browser.plugin2.DOM § com.sun.security.auth.callback.DialogCallbackHandler § com.sun.security.auth.module.SolarisLoginModule § com.sun.security.auth.module.SolarisSystem § com.sun.security.auth.PolicyFile § com.sun.security.auth.SolarisNumericGroupPrincipal § com.sun.security.auth.SolarisNumericUserPrincipal § com.sun.security.auth.SolarisPrincipal § com.sun.security.auth.X500Principal Removed Packages/Classes - com.sun.security.auth.SolarisNumericGroupPrincipal principal + com.sun.security.auth.UnixNumericGroupPrincipal principal
  • 23. JAVA 11 § com.sun.xml.internal.bind.* § java.awt.dnd.peer.* § java.awt.peer.* § javax.security.auth.Policy § sun.misc.BASE64Decoder § sun.misc.BASE64Encoder § sun.misc.Unsafe.defineClass § sun.plugin.dom.DOMObject Removed Packages/Classes - if(button.getPeer() != null) { + if(button.isDisplayable()) {
  • 24. JAVA 11 § java.lang.Runtime.getLocalizedInputStream(..) § java.lang.Runtime.getLocalizedOutputStream(..) § java.lang.Runtime.runFinalizersOnExit(..) § java.lang.SecurityManager.checkAwtEventQueueAccess() § java.lang.SecurityManager.checkMemberAccess(..) § java.lang.SecurityManager.checkSystemClipboardAccess() § java.lang.SecurityManager.checkTopLevelWindow(..) § java.lang.SecurityManager.classDepth(..) § java.lang.SecurityManager.classLoaderDepth() § java.lang.SecurityManager.currentClassLoader() § java.lang.SecurityManager.currentLoadedClass() § java.lang.SecurityManager.getInCheck() § java.lang.SecurityManager.inClass(..) § java.lang.SecurityManager.inClassLoader() Removed Methods - securityManager.checkAwtEventQueueAccess(); + securityManager.checkPermission(permission);
  • 25. JAVA 11 § java.lang.System.runFinalizersOnExit(..) § java.lang.Thread.destroy() § java.lang.Thread.stop(java.lang.Throwable) § java.util.jar.Pack200.Packer.addPropertyChangeListener(..) § java.util.jar.Pack200.Packer.removePropertyChangeListener(..) § java.util.jar.Pack200.Unpacker.addPropertyChangeListener(..) § java.util.jar.Pack200.Unpacker.removePropertyChangeListener(..) § java.util.logging.LogManager.addPropertyChangeListener(..) § java.util.logging.LogManager.removePropertyChangeListener(..) Removed Methods “Finalizers are inherently problematic, and their use can lead to performance issues, deadlocks, hangs, and other problematic behavior.” - JDK-8165641
  • 26. JAVA 17 § com.sun.awt.SecurityWarning § java.security.acl.* § java.util.jar.Pack200* § jdk.net.SocketFlow* § java.rmi.activation* Removed Packages/Classes § java.management.rmi.RMIConnectorServer.CREDENTIAL_TYPES Removed Constants
  • 27. JAVA 17 § java.io.FileInputStream.finalize() § java.io.FileOutputStream.finalize() § java.lang.Runtime.traceInstructions(boolean) § java.lang.Runtime.traceMethodCalls(boolean) § java.util.zip.ZipFile.finalize() § java.util.zip.Inflater.finalize() § java.util.zip.Deflater.finalize() § netscape.javascript.JSObject.getWindow(Applet) § sun.misc.Unsafe.defineAnonymousClass(Class<?> hostClass, byte[] data, Object[] cpPatches) § javax.net.ssl.SSLSession.getPeerCertificateChain()** § java.lang.thread.countStackFrames()** Removed Methods § javax.tools.ToolProvider() § java.lang.invoke.ConstantBootstraps() § java.lang.relect.Modifier() Removed Constructors **APIs now throw UnsupportedOperationException - javax.net.ssl.SSLSession.getPeerCerficateChain(); + javax.net.ssl.SSLSession.getPeerCerficates();
  • 28. Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
  • 29. § Breaks code into modules containing packages § Applications must declare dependency on modules for access § Disruptive for Java SE application migrations Java Platform Module System (JPMS) § Use JDeps or --illegal-access=warn|debug Use find issues in your application § Use --illegal-access=permit If migrating to Java 11 § --add-opens launcher option § Add-Opens jar Manifest Attribute If migrating to Java 17+ MODULARITY
  • 30. Top Migration Issues Missing Libraries Removed APIs Modularity & Strong Encapsulation Out-of-date Dependencies
  • 31. OUT-OF-DATE DEPENDENCIES Libraries (ASM, Mockito, Spring, Spring Boot, etc) Build Tools (Maven, Gradle, etc) IDE (Eclipse, IntelliJ, VS Code, etc) Application servers (Open Liberty, JBoss, WebLogic, etc) My advice: take this time to upgrade your dependencies to the latest supported version. Setup automation tools.
  • 32. MAKING THE MOVE TO JAVA 17 WHAT ABOUT DEPRECATIONS?
  • 33. KEEP AN EYE ON DEPRECATIONS § Java RMI Activation § Thread.destroy() and Thread.stop(Throwable t) Some recently removed deprecations include: § Java Security Manager § Primitive wrapper class constructors Some APIs currently deprecated for removal: Full list: https://docs.oracle.com/en/java/javase/17/docs/api/deprecated-list.html#for-removal
  • 34. MAKING THE MOVE TO JAVA 17 WHAT TOOLS CAN I USE TO MAKE MY MIGRATION EASIER?
  • 35. USE CONTAINERS TO STAY UP TO DATE ¡ Use containers to easily keep your Java versions up to date ¡ This can be used to ensure you stay up to date with the latest fix packs, as well as test out new Java versions
  • 36. Application Binary Scanner Tool § Download: ibm.biz/WAMT4AppBi naries or Maven § Command line tool (free personal and commercial use) § Scans an application binary for migration issues and produces a report with identified problems, solutions and resource links § Documentation JDeps § Command utility shipped with JDK (run with the target Java version – Java 11+) § Migration Relevant Option: -jdkinternals § Binary scanner will recommend running JDeps if it identifies internal APIs § Documentation Tools to automate dependency updates (various options) § Use an auto-upgrade dependency tool to keep your dependencies up-to- date § Configure the tools to update based on various settings (frequency, etc) § Example: Dependabot Eclipse Transformer § Transform application binaries or source code to use the new package names in Jakarta EE 9+ § Documentation TOOLS
  • 37. DEMO
  • 38. NEXT STEPS Step 1 Evaluate your applications using the tools. Step 2 Try running your application on Java 17. If your app runs successfully, you can skip the next two steps. Step 3 Debug and fix your application code or build files. Repeat steps 1-3. Step 4 Update your dependencies and tools as needed. Step 5 Run all your application tests. Step 6 Celebrate!
  • 39. HELPFUL LINKS ¡ Our blog on adding the Java 17 feature to the migration tools (written instructions on running binary scanner): https://developer.ibm.com/tutorials/migration-to-java-11-made-easy/ ¡ Binary Scanner and Eclipse IDE Plugin Source Scanner downloads: ibm.biz/wamtdownloads § Documentation: https://www.ibm.com/docs/wamt ¡ Link to the java17demo GitHub repo: https://github.com/alexsm82/java17demo ¡ Oracle Java SE Support Roadmap: https://www.oracle.com/java/technologies/java-se-support- roadmap.html ¡ Java Version Almanac: https://javaalmanac.io/ ¡ Andy Guibert’s blog on OpenLiberty Java 11+ support: https://openliberty.io/blog/2019/02/06/java- 11.html ¡ Blog on running the binary scanner with Maven: https://community.ibm.com/community/user/wasdevops/blogs/alex- motley1/2022/04/12/applications-pipelines-and-migrations
  • 40. IBM SESSIONS ¡ Tuesday 10:00AM Fast JVM Startup with Checkpoint and Restore – Tobi Ajila | JVM Platform ¡ Tuesday 2:15PM Better, Stronger, Faster Java in the Cloud - Jarek Gawor and Tobi Ajila |Main Room (Java) ¡ 3:15 Book signing – Cloud Native Application Development with MicroProfile and Open Liberty and Birthday Cake ¡ Wednesday 10:00AM Making the Move to Java 17 – Alex Motley and Cindy High | Main Room (Java) ¡ Wednesday 1:15PM Relook at Microservices – Emily Jiang | Main Room (Java)