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LyonJUG : Comment Jigsaw est prêt à tuer le classpath
- 1. Alexis Hassler Jigsaw est prêtà tuer le classpath octobre 2016
- 2. "Classpath is dead!" MarkReinhold JavaOne 2009
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- 6. String hello ="Salut à vous tous les zazous"; MyStuff var; Chercher les classes CLASSPATH
- 7. -classpath java -cp hello-lib.jarHelloWorld
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- 13. Classpath Géré par desclassloaders
- 14. java.lang.ClassLoader loadClass(String name) :Class<?> getResource(String name) : URL getResources(String name) : Enumeration<URL> getResourceAsStream(String name) : InputStream getParent() : ClassLoader
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- 19. Délégation java -cp hello-lib.jar... System.getProperty("java.class.path"); ClasspathSystem ClassLoader
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- 22. bootclasspath java -Xbootclasspath:hello-rt.jar ... java-Xbootclasspath/a:hello-lib.jar ... java -Xbootclasspath/p:hello-lib.jar ...
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- 25. Endorsed APIs standards horsJCP org.omg (CORBA), org.w3c.dom, org.xml.sax (XML) APIs standalone JAXP, JAXB, Scripting, Compiler API,...
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- 27. example.jar Démonstration BootstrapClassLoader java -cp example.jarfr.sewatech.classpath.Count System ClassLoader java.lang.Integer
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- 30. URLClassloader System ClassLoader Bootstrap ClassLoader URLClassLoader URL ClassLoader URL ClassLoader Parent first Parent first Parent first
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- 32. Démonstration java -cp service.jar:launcher.jarfr.sewatech.classpath.Hello message-launcher message-main message-common message-printer message-service
- 33. message-launcher message-common message-printer message-service Démonstration java -cp service.jar:launcher.jarfr.sewatech.classpath.HelloViaUrl message-serviceClasspath URLClassloader
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- 35. FLTM Classloader Fait LeToi-Même
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- 38. JBoss AS 5 System Bootstrap Common WebApp Ent App Web Module EJB Module Local First Repo First
- 39. Erreurs ClassCastException org.project.SomeStuff cannot be castto org.project.SomeStuff
- 40. Erreurs URL ClassLoader URL ClassLoader MyStuffvar = MyStuffFactory.build(); return new MyStuff() ; ≠
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- 47. Runtime ClasspathA plat Fichiers jar justedu stockage pas ou peu de métadonnée
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- 54. OSGi Bundle Fichier jar META-INF/MANIFEST.MF Import /export de packages
- 55. Bundle-Name = SimpleBundle Bundle-SymbolicName = simple-bundle Bundle-Description = Simple Bundle Bundle-Version = 1.0.1 Export-Package = fr.sewatech.mystuff.services Import-Package = org.osgi.framework;version=1.3 OSGi
- 56. OSGi OS + Hardware JavaExecution Environment Applications (bundles) Module Life Cycle Services
- 58. JBoss Modules Sous-projet deWildfy Inspiré de Jigsaw (version 2010) Base de JBoss OSGi
- 59. JBoss Modules java -jarjboss-modules.jar -mp path/to/modules my.main.module.name Java SE
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- 61. JBoss Modules <?xml version="1.0"encoding="UTF-8"?> <module xmlns="urn:jboss:module:1.1" name="org.hibernate"> <resources> <resource-root path="hibernate-core-4.0.0.Final.jar"/> <resource-root path="hibernate-commons-annotations-4.0.1.Final.jar"/> <resource-root path="hibernate-entitymanager-4.0.0.Final.jar"/> </resources> ... </module>
- 62. <?xml version="1.0" encoding="UTF-8"?> <modulexmlns="urn:jboss:module:1.1" name="org.hibernate"> ... <dependencies> <module name="javax.api"/> <module name="javax.persistence.api"/> <module name="javax.transaction.api"/> <module name="org.apache.commons.collections"/> <!-- ... --> </dependencies> </module> JBoss Modules
- 63. JBoss Modules <?xml version="1.0"encoding="UTF-8"?> <module xmlns="urn:jboss:module:1.1" name="fr.sewatech.message-launcher"> <main-class name="fr.sewatech.classpath.Hello"/> ... </module>
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- 65. JBoss Modules Artefacts ≠Modules Notions différentes Build diffcile Mauvaise intégration aux outils
- 66. Jigsaw Projet OpenJDK Intégré auJDK 7 (2008) 9 (2016) 8 (2012) (2017)
- 67. Jigsaw Modularité du JDK Corbapour Hello World ? Swing pour Tomcat ?
- 68. Jigsaw Modularité des applications module-info.java modulemessage.service { requires java.xml.bind; requires message.common; exports fr.sewatech.message; }
- 69. Jigsaw Compilation javac --module-path modules -d target/classes/ $(find src/main/java/ -name "*.java")
- 70. Jigsaw Exécution java --module-path jigsaw-modules -m misc.examples/fr.sewatech.example.Main
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- 76. Specifcations JSR 376: Java PlatformModule System JSR 379: Java SE 9
- 77. Specifcations JEPs JEP 261: ModuleSystem JEP 200: The Modular JDK JEP 260: Encapsulate Most Internal APIs JEP 201: Modular Source Code JEP 220: Modular Run-Time Images JEP 282: jlink: The Java Linker
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- 80. Modular JDK Standard APIs java.*,javax.* Supported APIs com.sun.*, jdk.* Unsupported APIs sun.* sun.misc.Unsafe, sun.misc.BASE64Decoder, sun.misc.BASE64Encoder
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- 82. Classpath mode Classpath isNOT dead java -classpath lib/* fr.sewatech.example.Main
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- 84. Dependencies module message.service { requiresmessage.printer; requires message.common; } message.service message.printer message.common
- 85. Dependencies module message.service { requiresmessage.printer; } module message.printer { requires transitive message.common; } message.service message.printer message.common
- 86. Dependencies Automatic modules module message.service{ requires slf4j.api; } message.service slf4j.api slf4j-api-1.5.2.
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- 88. Dependencies Optional Required at compiletime module message.service { requires static message.printer; }
- 89. Dependencies module message.service @1.0 { requires message.printer @ 1.0; requires slf4j.api @ 1.7; } Module version
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- 92. Exports Java accessibility public forother modules module message.service { exports fr.sewatech.message; }
- 93. Exports Java accessibility public forsome modules module java.base { exports sun.reflect to java.logging, java.sql, jdk.scripting.nashorn; }
- 94. Exports module message.service { exportsprivate java.security; } Encapsulation vs Refection setAccessible(true) field.setAccessible(true); // => java.lang.reflect.InaccessibleObjectException
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- 101. Patch Compile javac -Xmodule:java.base -d../patch-classes src/java/lang/Integer.java
- 102. Patch Run java --patch-module java.base=../patch-classes --module-path jigsaw-modules -m misc.examples
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- 104. Layers No Version module message.service@ 1.0 { requires message.printer @ 1.0; requires slf4j.api @ 1.7; }
- 105. Layers Highlander rule #1 « ThereCan Be Only One »
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- 107. Layers Boot Layer App LoaderPlatform Loader Boot Loader message.service slf4j.api java.basejava.xml.bind Java Module System Java Virtual Machine
- 108. Layers Boot Layer Java ModuleSystem Java Virtual Machine
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- 113. Apprendre + JavaOne http://openjdk.java.net/projects/jigsaw/talks/ Quick-Start Guide http://openjdk.java.net/projects/jigsaw/quick-start TheState of the Module System http://openjdk.java.net/projects/jigsaw/spec/sotms/
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