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Making The Move To Java 17 (JConf 2022)

A
Alex Motley

Are your applications still running on Java 8 or even older, unsupported versions? Or maybe you've already made the move to Java 11? Thinking about switching your application to run on Java 17 and not sure where to start? There is a lot to think about when it comes to planning a Java migration, but there are tools and strategies that can help! Come to this session to learn about the significant changes in Java that might impact your application. Topics include the removal of APIs (such as Java EE packages) and behavior changes resulting from moving an application running previous Java versions to Java 17. Learn about tools to use that help you identify potential issues within your application and how to resolve them! The discussion is informative to developers and system administrations who are interested in evaluating applications before they are migrated and while making the code changes.

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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
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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)