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Devoxx17 - Préparez-vous à la modularité selon Java 9
- 1. Préparez-vous à la modularité selonJava 9 Rémi Forax Alexis Hassler #DevoxxFR
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- 5. Classpath - compiletime Build tool Maven Gradle … #DevoxxFR
- 6. Classpath - runtime jarjarjarjarjarjarjar jar jarjar asm-3.1.jarjarjar asm-2.3.jar #DevoxxFR
- 7. Scale Down rt.jar 66 MB guava.jar 2.3MB spring- context.jar 1 MB #DevoxxFR
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- 13. Modular JDK java.basejava.desktop java.sql java.namingjava.xmljava.compiler java.logging java.management #DevoxxFR
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- 15. Deprecated JDK modules java.xml.bindjava.xml.ws java.xml.ws.annotations java.transaction java.corba java.activation #DevoxxFR
- 16. Deprecated JDK modules 69…back to Java EE #DevoxxFR
- 17. Non-standard JDK modules sun.*com.sun.* Deleted classes Hidden packages #DevoxxFR
- 18. Non-standard JDK modules Internalmodules jdk.net jdk.attach jdk.httpserver jdk.* #DevoxxFR
- 19. Module descriptor /* module-info.java*/ module app.main { requires java.base; requires java.sql; requires java.management; } #DevoxxFR
- 20. Build module javac -dtarget/main/exploded --source-path src/main/java $(find src/main/java -name "*.java") jar --create --file target/main/artifact/app.main-1.0.jar -C target/exploded/app.main . #DevoxxFR
- 21. Run module java --module-pathmodules --class-path dependencies/library.jar -m app.main/com.app.main.Main #DevoxxFR
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- 25. Module descriptor /* module-info.java*/ module app.main { requires java.sql; requires java.management; requires app.module1; requires app.module2; } #DevoxxFR
- 26. Export package module app.module1{ …; exports com.app.api; } #DevoxxFR
- 27. Multi-modules layout 1 project= n modules javac -d target/main/exploded --module-source-path src/main/java $(find src/main/java -name "*.java") #DevoxxFR
- 28. Multi-modules layout src/main/java app.main module-info.java fr/app/pkg ... .java fr/app/main Main.java app.api module-info.java afolder with a qualified name ... #DevoxxFR
- 29. Create module jar --create --file target/main/artifact/app.main-1.0.jar --main-class com.app.main.Main -C target/exploded/app.main . #DevoxxFR
- 30. The Jigsaw Sandwich Runtime Compiletime #DevoxxFR
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- 32. Create module jar --create --file target/main/artifact/app.main-1.0.jar --module-version=1.0 --main-class com.app.main.Main -C target/exploded/app.main . #DevoxxFR
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- 38. Visibility Public Forother module module app.api { …; exports com.app.api; } #DevoxxFR
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- 40. Regular export module app.impl{ … exports com.app.internal; } #DevoxxFR app.main com.app.internal app.impl app.api com.app.api ?
- 41. Restricted export module app.impl{ … exports com.app.internal to app.api } #DevoxxFR app.main com.comp.app.internal app.impl app.api com.comp.app.api ?
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- 44. sun.misc.Unsafe module java.base { … exports sun.misc; exports jdk.internal.misc to java.rmi, java.sql, jdk.charsets, … } module jdk.unsupported { exports sun.misc; } New internal unsafe API (hidden) Keep sun.misc in 9, remove features when public replacement APIs exist #DevoxxFR
- 45. Deep reflection field.setAccessible(true); java.lang.reflect.InaccessibleObjectException #DevoxxFR
- 46. Deep reflection Open apackage module app.impl { …; opens exports com.app.internal; } Open all the packages of the module open module app.impl { …; } #DevoxxFR
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- 49. Transitive dependency module app.module1{ requires …; requires transitive app.module2; } module app.main { requires …; requires app.module1; requires app.module2; } #DevoxxFR
- 50. Static dependency module app.module1{ requires …; requires static app.module2; } Compile time only #DevoxxFR
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- 52. Plain old jar Nodependency to classpath javac --class-path deps/old-lib-1.2.jar … #DevoxxFR
- 53. Plain old jar app.mainapp.module1 old-lib-1.2classpath modulepath #DevoxxFR
- 54. Automatic Module Plain oldjar in module-path javac --module-path deps … module app.module1 { …; requires old.lib; } #DevoxxFR
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- 57. Mixed mode javac --module-pathdeps --class-path deps/other-lib.jar … #DevoxxFR
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- 62. User / Provider moduleapp.main { requires app.api; uses … .api.Service; } module app.impl { requires app.api; provides … .api.Service with … .service.ServiceImpl; } #DevoxxFR Main Service ServiceImpl module app.api { exports … .api; }
- 63. Usage … ServiceLoader.load(ModuleInput.class) .stream() . … ; … #DevoxxFR
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- 65. Running on Java9 Compiling in Java 8 #DevoxxFR
- 67. Big kill switch --permit-illegal-access This option will only be supported in JDK 9. It will be removed in JDK 10. #DevoxxFR
- 68. Command line java/ javac Add root module --add-modules #DevoxxFR
- 69. Command line java/ javac --add-reads module=anotherModule --add-exports module/package=anotherModule --add-opens module/package=anotherModule #DevoxxFR
- 70. jdeps Diagnostic tool since Java8 jdeps --jdk-internals #DevoxxFR
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- 73. Test module Compile time app.module1 com.app.pkg1 <<requires>><<requires>> com.app.pkg1.test app.module1.test <<reads>> junit org.junit #DevoxxFR
- 74. Test module Test module-info.java moduleapp.module1.test { requires junit; requires app.module1; } #DevoxxFR
- 75. Test module Compile $JAVA_HOME/bin/javac -d target/test/exploded --module-path dependencies:target/main/artifact $(find src/test/java/ -name "*.java") #DevoxxFR
- 76. Test module Run time hamcrest-core app.module1 com.app.pkg1 <<requires>><<requires>> com.app.pkg1.test app.module1.test <<reads>><<reflection>> junit org.junit #DevoxxFR
- 77. Test module Run $JAVA_HOME/bin/java --module-path dependencies: target/main/artifact:target/test/artifact --class-path dependencies/hamcrest-core-1.3.jar --add-modules app.module1.test -m junit/org.junit.runner.JUnitCore com.app.pkg1.test.AClassTest #DevoxxFR
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- 80. Single module Compile $JAVA_HOME/bin/javac -d target/test/exploded --module-path dependencies:target/main/artifact --add-reads app.module1=junit --add-modules junit --patch-module app.module1=src/test/java $(find src/test/java/ -name "*.java") #DevoxxFR
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- 82. Single module Run $JAVA_HOME/bin/java --module-path dependencies: target/main/artifact --class-path dependencies/hamcrest-core-1.3.jar --add-modules app.module1 --add-reads app.module1=junit --add-exports app.module1/com.app.pkg1=junit --patch-module app.module1=target/test/exploded -m junit/org.junit.runner.JUnitCore com.app.pkg1.AClassTest #DevoxxFR
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- 85. jlink Custom runtime image Specificfor a platform For small devices or in the cloud #DevoxxFR
- 86. jlink $ jlink --module-path$JAVA_HOME/jmods: target/modules --add-modules app.main, app.service --launcher appx=app.main --output target/image #DevoxxFR
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- 88. Minimal VM $ jlink… --vm=minimal --output image size of the classical VM: 20 megs size of the minimal VM: 3 megs #DevoxxFR
- 89. Ahead Of Timecompilation experimental feature ! Module ⇒ shared library .so, .dll, .dynlib $ jaotc --module-path target/modules --module app.main #DevoxxFR
- 90. Ahead Of Timecompilation experimental feature ! Run in AOT mode ./image/bin/java -XX:+UseAOT -XX:AOTLibrary=./lib/libjava.base.so … #DevoxxFR
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- 94. Jigsaw Goals Reliable configuration Noclasspath anymore compile time / runtime fidelity #DevoxxFR
- 95. Jigsaw Goals Scale downthe platform downsized unit of re-use #DevoxxFR
- 96. Jigsaw Goals Strong encapsulation Separatepublic types from implementation Enhanced security #DevoxxFR
- 97. Jigsaw Goals Closed World Aheadof time optimizations #DevoxxFR
- 98. Jigsaw Goals Reliable configuration Scaledown the platform Strong encapsulation Closed World #DevoxxFR
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- 101. Références Download JDK 9Early Access https://jdk9.java.net/download/ Oracle JDK 9 Documentation http://docs.oracle.com/javase/9/ JavaOne, DevoxxBE talks http://openjdk.java.net/projects/jigsaw/talks/ #DevoxxFR
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