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LausanneJUG 2017 - Jigsaw est prêt à tuer le classpath
The document discusses the evolution of the Java classpath and the introduction of the Jigsaw module system in Java 9, highlighting key concepts such as class loaders, dependencies, and modularization. It provides examples of command-line usage for classpaths and the new module system, emphasizing the shift from traditional classpath management to modular application development. The conclusion suggests that while the classpath is a foundational element, the module system represents the future of Java application architecture.
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LausanneJUG 2017 - Jigsaw est prêt à tuer le classpath
- 1. 1DEVFEST NANTES 16 Jigsaw estprêt à tuer le classpath @AlexisHassler février 2017
- 2. "Classpath is dead!" MarkReinhold JavaOne 2009
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- 6. 6 String hello ="Salut à vous tous les zazous"; Chercher les classes CLASSPATH Hello var = new Hello();
- 7. 7 -classpath java -cp hello-lib.jarHelloWorld
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- 10. 10 java.lang.ClassLoader loadClass(String name) : Class<?> getResource(Stringname) : URL getResourceAsStream(String name) : InputStream getParent() : ClassLoader
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- 15. 15 Délégation System ClassLoader java -cphello-lib.jar ...
- 16. 16 bootclasspath java -Xbootclasspath/p:hello-lib.jar ... java-Xbootclasspath:hello-rt.jar ... java -Xbootclasspath/a:hello-lib.jar ... BootstrapClassLoader
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- 18. 18 Démonstration BootstrapClassLoader java -cp example.jarfr.sewatech.classpath.Count System ClassLoader java.lang.Integer example.jar java.lang.Integer
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- 21. 21 URLClassloader System ClassLoader Bootstrap ClassLoader URLClassLoader URL ClassLoader URL ClassLoader Parent first Parent first Parent first
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- 38. 38 Bundle-Name = HelloService Bundle-SymbolicName = hello-service Bundle-Description = Hello Service Bundle Bundle-Version = 1.0.1 Export-Package = fr.sewatech.classpath Import-Package = fr.sewatech.classpath.print;version=1.3 OSGi Bundle
- 39. 39 OSGi OS + Hardware JavaRuntime Module Life Cycle Services
- 40. 40 JBoss Modules java -jarjboss-modules.jar -mp path/to/modules my.main.module.name Base de JBoss OSGi Java SE
- 41. 41 JBoss Modules module.xml resource dependencyslot dependency slot dependency slot name slot resource resource
- 42. 42 Jigsaw 9 (2016) 8 (2012) (2017) Projet Intégréau JDK 7 (2008)
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- 44. 44 Jigsaw Modularité des applications //module-info.java module message.service { requires java.xml.bind; requires message.common; exports fr.sewatech.message; }
- 45. 45 Jigsaw Compilation javac --module-path modules -d target/classes/ $(find src/main/java/ -name "*.java")
- 46. 46 Jigsaw Exécution java --module-path jigsaw-modules -m misc.examples/fr.sewatech.example.Main
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- 49. 49 Classpath mode java -classpathlib/* fr.sewatech.example.Main
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- 53. 53 Dependencies module message.service { requiresmessage.printer; requires slf4j.api; } module message.printer { requires transitive message.common; } message.printer message.service message.common
- 54. 54 module message.service { requiresmessage.printer; requires slf4j.api; } Dependencies Automatic modules slf4j-api- 1.5.2. slf4j.api message.service
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- 56. 56 Dependencies module message.service @1.0 { requires message.printer @ 1.0; requires slf4j.api @ 1.7; } Module version
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- 59. 59 Exports Accessibility public for othermodules module message.service { exports fr.sewatech.message; }
- 60. 60 Exports Accessibility public for somemodules module java.base { exports sun.reflect to java.logging, java.sql, jdk.scripting.nashorn; }
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- 64. 64 BootClassLoader bootclasspath java -Xbootclasspath/p:hello-lib.jar ... java-Xbootclasspath:hello-rt.jar ... java -Xbootclasspath/a:hello-lib.jar ...
- 65. 65 Patch Compile Run javac -Xmodule:java.base -d../patch-classes src/java/lang/Integer.java java --patch-module java.base=patch.jar --module-path jigsaw-modules -m misc.examples
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- 68. 68 Aller plus hawavec Jigsaw Service Providers / Loaders jlink : custom JRE jdeps : migration Layers : versioning ...
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- 70. 70 Packaging Mod files jmod create --class-pathmods/message-service.jar:mods/slf4j-api.jar message-service.jmod classes/... conf/... native/ ...
- 71. 71 Packaging Linking jlink --module-path $JAVA_HOME/jmods:mods --add-modulesmessage-service.jmod --output message-app bin └ java conf └ ... lib └ ... modules
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- 73. 73 Service Provider Consumer ServiceLoader<MessageService> loader =ServiceLoader.load(MessageService.class); for (MessageService service : loader) { ... }
- 74. 74 Service Provider # module-info.java modulemessage.service.full { requires message.service; exports fr.sewatech.message.impl; // NO ! provides fr.sewatech.message.MessageService with fr.sewatech.message.impl.FullMessageService; } Provider (Java 9)
- 75. 75 Service Provider Consumer # module-info.java modulemessage.launcher { requires message.service; uses fr.sewatech.message.MessageService ; }
- 76. 76 Migration java / javacarguments --add-modules --add-exports --add-opens jdeps jdeps --jdk-internals ./
- 77. 77 Migration Multi-Release JAR Files JARFile First.class META-INF Second.class Third.class versions 9 First.class
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- 80. 80 Planning Outils ? Maven, Gradle, IDE Librairies ? SLF4J,Guava,... Frameworks ? Spring, Hibernate,... Runtimes ? Java EE, Tomcat,... Hadoop,...
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- 82. 82 Apprendre + JavaOne, Devoxx http://openjdk.java.net/projects/jigsaw/talks/ Quick-StartGuide http://openjdk.java.net/projects/jigsaw/quick-start The State of the Module System http://openjdk.java.net/projects/jigsaw/spec/sotms/
- 83. 83 Apprendre + Oracle JDK9 Documentation http://docs.oracle.com/javase/9/
- 84. 84 module-path is born classpathis NOT dead Conclusion
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