{"id":3520,"date":"2016-04-14T21:09:40","date_gmt":"2016-04-14T20:09:40","guid":{"rendered":"http:\/\/blog.fabianpiau.com\/?p=3520"},"modified":"2020-04-10T12:47:10","modified_gmt":"2020-04-10T11:47:10","slug":"qcon-london-2016-project-jigsaw-in-jdk-9-modularity-comes-to-java","status":"publish","type":"post","link":"https:\/\/blog.fabianpiau.com\/fr\/2016\/04\/14\/qcon-london-2016-project-jigsaw-in-jdk-9-modularity-comes-to-java\/","title":{"rendered":"QCon London 2016 &#8211; Projet Jigsaw dans JDK 9 &#8211; La modularit\u00e9 arrive sur Java"},"content":{"rendered":"<p><a class=\"lang\" href=\"https:\/\/blog.fabianpiau.com\/en\/2016\/04\/14\/qcon-london-2016-project-jigsaw-in-jdk-9-modularity-comes-to-java\/\" title=\"Read in english\"><strong class=\"labellang\"><span class=\"en\">&nbsp;<\/span>English version available<\/strong><\/a><\/p>\n<p>Simon Ritter a donn\u00e9 une pr\u00e9sentation sur le futur JDK 9 \u00e0 QCon London.<\/p>\n<div style=\"max-width: 560px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/blog.fabianpiau.com\/wp-content\/uploads\/post\/00084\/jdk9-qcon-london.png?ssl=1\" rel=\"shadowbox[sbpost-3520];player=img;\" title=\"QCon London 2016 - Projet Jigsaw dans JDK 9 - La modularit\u00e9 arrive sur Java by Simon Ritter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/blog.fabianpiau.com\/wp-content\/uploads\/post\/00084\/jdk9-qcon-london-thumbnail.png?resize=550%2C365&#038;ssl=1\" alt=\"QCon London 2016 - Projet Jigsaw dans JDK 9 - La modularit\u00e9 arrive sur Java\" title=\"QCon London 2016 - Projet Jigsaw dans JDK 9 - La modularit\u00e9 arrive sur Java\" width=\"550\" height=\"365\" class=\"size-medium wp-image-257\" \/><\/a><p class=\"wp-caption-text\">QCon London 2016 - Projet Jigsaw dans JDK 9 - La modularit\u00e9 arrive sur Java<\/p><\/div>\n<p><br clear=\"none\" \/><\/p>\n<h4>La politique de compatibilit\u00e9 de Java<\/h4>\n<p>Il a commenc\u00e9 avec un fait int\u00e9ressant: depuis longtemps, Java a une politique de compatibilit\u00e9 permanente.<br \/>\nSi une application utilise uniquement des API prises en charge par une version N de Java, elle devrait parfaitement fonctionner sur la version N+1, sans m\u00eame devoir \u00eatre recompil\u00e9e.<br \/>\nVoil\u00e0 pourquoi, \u00e0 ce jour, il y a:<\/p>\n<ul>\n<li>23 classes, 18 interfaces et 379 m\u00e9thodes qui ont \u00e9t\u00e9 d\u00e9pr\u00e9ci\u00e9es<\/li>\n<li>Et rien qui n&rsquo;a \u00e9t\u00e9 supprim\u00e9.<\/li>\n<\/ul>\n<p><br clear=\"none\" \/><\/p>\n<h4>JDK 9 apporte des incompatibilit\u00e9s<\/h4>\n<p>Le JDK est devenu de plus en plus lourd au fil des ann\u00e9es. Les choses vont changer avec la version 9.<\/p>\n<ul>\n<li>Un petit nombre d&rsquo;API actuellement support\u00e9es sera supprim\u00e9<\/li>\n<li>La structure binaire du JRE et JDK va changer (voire les d\u00e9tails ci-dessous)<\/li>\n<li>Il est interdit d&rsquo;utiliser le caract\u00e8re underscore <code>_<\/code> pour nommer une variable. C&rsquo;est maintenant un mot-cl\u00e9 r\u00e9serv\u00e9.<\/li>\n<li>Il y aura un nouveau syst\u00e8me de versionnage de sorte qu&rsquo;il sera plus facile de faire la distinction entre les versions majeures, mineures, ou les mises \u00e0 jour li\u00e9es \u00e0 la s\u00e9curit\u00e9 ; par exemple, Java 9.1.2.1. Le format de versionnage actuel est difficile \u00e0 comprendre, par exemple les versions 8u51 et 8u60 ne sont pas tr\u00e8s explicites.<\/li>\n<\/ul>\n<p>La structure du JDK va changer. Le dossier JRE est supprim\u00e9, <code>tools.jar<\/code> et <code>rt.jar<\/code> ne seront plus pr\u00e9sents, ces JARs contenaient pas mal de duplication.<\/p>\n<div style=\"max-width: 372px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" title=\"Structure Pre-JDK 9\" src=\"https:\/\/i0.wp.com\/blog.fabianpiau.com\/wp-content\/uploads\/post\/00084\/pre-jdk9-structure.png?resize=362%2C357&#038;ssl=1\" alt=\"Structure pre-JDK 9\" width=\"362\" height=\"357\" \/><p class=\"wp-caption-text\">Structure Pre-JDK 9<\/p><\/div>\n<p>Pour mieux comprendre la structure pre-JDK 9, vous pouvez lire <a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/technotes\/tools\/windows\/jdkfiles.html\" target=\"_blank\" title=\"JDK and JRE File Structure\" rel=\"noopener noreferrer\">JDK 8 and JRE File Structure<\/a>.<\/p>\n<div style=\"max-width: 384px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" title=\"Structure JDK 9\" src=\"https:\/\/i0.wp.com\/blog.fabianpiau.com\/wp-content\/uploads\/post\/00084\/jdk9-structure.png?resize=374%2C192&#038;ssl=1\" alt=\"Structure JDK 9\" width=\"374\" height=\"192\" \/><p class=\"wp-caption-text\">Structure JDK 9<\/p><\/div>\n<p>La structure du JDK 9 est beaucoup plus propre.<\/p>\n<p><a href=\"http:\/\/openjdk.java.net\/jeps\/260\" target=\"_blank\" title=\"JEP 260 proposal\" rel=\"noopener noreferrer\">JEP 260 proposal<\/a> est au coeur du JDK 9 et Jigsaw.<\/p>\n<p>L&rsquo;id\u00e9e est de rendre la plupart des API internes du JDK inaccessibles par d\u00e9faut, mais en en laissant tout de m\u00eame quelques-unes (celles qui sont largement utilis\u00e9es et sont donc critiques) jusqu&rsquo;\u00e0 ce qu&rsquo;elles soient remplac\u00e9es.<\/p>\n<p>Le but est d&rsquo;encapsuler toutes les API d\u00e9pr\u00e9ci\u00e9es dans un module, et finalement de s&rsquo;en d\u00e9barrasser plus tard (JDK 10?).<\/p>\n<blockquote><p>\nDepuis la version 8 du JDK, un outil en ligne de commande existe pour analyser les d\u00e9pendances de votre JAR ou de vos classes: <a href=\"https:\/\/wiki.openjdk.java.net\/display\/JDK8\/Java+Dependency+Analysis+Tool\" target=\"_blank\" title=\"Jdeps\" rel=\"noopener noreferrer\">jdeps<\/a>. Essayez-le! Il peut \u00eatre utile pour savoir si vous utilisez encore des API internes du JDK. Vous devriez \u00e9viter d&rsquo;utiliser de telles d\u00e9pendances, car elles peuvent \u00eatre supprim\u00e9es dans une future version du JDK.\n<\/p><\/blockquote>\n<p><br clear=\"none\" \/><\/p>\n<h4>Jigsaw et les modules<\/h4>\n<p>Nous parlons de module, mais qu&rsquo;est-ce que c&rsquo;est en fait?<br \/>\nJigsaw apporte de la modularit\u00e9 au JDK. Il rend Java plus \u00e9volutif et flexible, tout en am\u00e9liorant la s\u00e9curit\u00e9, la maintenabilit\u00e9 et la performance.<br \/>\nLe JDK est divis\u00e9 en modules, l&rsquo;id\u00e9e est de prendre seulement ce dont on a besoin.<\/p>\n<p><strong>Module<\/strong><\/p>\n<p>Un module est un regroupement de code (collection de packages), il peut \u00e9galement contenir:<\/p>\n<ul>\n<li>Du code natif<\/li>\n<li>Des ressources<\/li>\n<li>Des donn\u00e9es de configuration<\/li>\n<\/ul>\n<p><strong>Mon premier module<\/strong><\/p>\n<p>Pour d\u00e9finir un module, vous devez cr\u00e9er un fichier <code>module-info.java<\/code>, qui contiendra (par exemple):<\/p>\n<pre class=\"brush: java; light: true; title: ; notranslate\" title=\"\">\r\nmodule com.company.mymodule { \r\n  requires com.company.myothermodule; \r\n  requires java.sql; \r\n}\r\n<\/pre>\n<p>Vous pouvez avoir des d\u00e9pendances transitives (un peu comme dans Maven) gr\u00e2ce au mot-cl\u00e9 <code>public<\/code>.<\/p>\n<pre class=\"brush: java; light: true; title: ; notranslate\" title=\"\">\r\nmodule java.sql { \r\n  requires public java.logging; \r\n}\r\n<\/pre>\n<p>Cela signifie que si j&rsquo;ai une d\u00e9pendance sur le module <code>java.sql<\/code>, je vais avoir acc\u00e8s \u00e0 toutes les classes incluses dans <code>java.logging<\/code> (tout du moins tous les types marqu\u00e9s <code>public<\/code>).<\/p>\n<p>Nous avons maintenant un graphe de d\u00e9pendances des modules.<\/p>\n<p><strong>Visibilit\u00e9 d&rsquo;un package<\/strong><\/p>\n<p>Avec l&rsquo;utilisation du mot-cl\u00e9 <code>exports<\/code>.<\/p>\n<pre class=\"brush: java; light: true; title: ; notranslate\" title=\"\">\r\nmodule com.company.myothermodule { \r\n  exports com.company.myothermodule.alpha;  \r\n  exports com.company.myothermodule.beta; \r\n}\r\n<\/pre>\n<p>Ce qui est export\u00e9 est visible, \u00e7a ne l&rsquo;est pas par d\u00e9faut!<\/p>\n<p>Avec Java 9 et l&rsquo;arriv\u00e9e des modules, nous devons red\u00e9finir le mot-cl\u00e9 <code>public<\/code>. Il a maintenant plusieurs significations:<\/p>\n<ul>\n<li>Public \u00e0 tout le monde<\/li>\n<li>Public, mais seulement \u00e0 des modules particuliers<\/li>\n<li>Public, uniquement \u00e0 l&rsquo;int\u00e9rieur d&rsquo;un module<\/li>\n<\/ul>\n<p>Public ne signifie plus n\u00e9cessairement accessible, c&rsquo;est un changement fondamental.<br \/>\nVous pouvez lire la <a href=\"http:\/\/openjdk.java.net\/projects\/jigsaw\/spec\/sotms\/\" target=\"_blank\" title=\"sp\u00e9cification de Jigsaw\" rel=\"noopener noreferrer\">sp\u00e9cification de Jigsaw<\/a> pour en savoir plus.<\/p>\n<p><strong>Compilation et ex\u00e9cution avec le \u00ab\u00a0module path\u00a0\u00bb<\/strong><\/p>\n<p>Oubliez le <code>classpath<\/code>, il y a un nouveau param\u00e8tre <code>modulepath<\/code> (ou <code>-mp<\/code>) disponible avec la commande <code>javac<\/code> \/ <code>java<\/code>. Sa valeur contient un ou plusieurs r\u00e9pertoires qui contiennent les modules n\u00e9cessaires pour compiler \/ ex\u00e9cuter votre application.<\/p>\n<p>Enfin, notez qu&rsquo;il y aura des modules par d\u00e9faut pour les fichiers JAR qui ne sont pas encore modularis\u00e9s (module automatique).<br \/>\n<\/p>","protected":false},"excerpt":{"rendered":"<p>&nbsp;English version available Simon Ritter a donn\u00e9 une pr\u00e9sentation sur le futur JDK 9 \u00e0 QCon London. La politique de compatibilit\u00e9 de Java Il a commenc\u00e9 avec un fait int\u00e9ressant: depuis longtemps, Java a une politique de compatibilit\u00e9 permanente. Si une application utilise uniquement des API prises en charge par une version N de Java, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3523,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[53,278,277],"class_list":["post-3520","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-event","tag-java","tag-jigsaw","tag-qcon"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>QCon London 2016 - Projet Jigsaw dans JDK 9 - La modularit\u00e9 arrive sur Java | CarmaBlog<\/title>\n<meta name=\"description\" content=\"&nbsp;English version available Simon Ritter a donn\u00e9 une pr\u00e9sentation sur le futur JDK 9 \u00e0 QCon London. 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