{"id":143670,"date":"2025-09-17T11:12:01","date_gmt":"2025-09-17T09:12:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-java-se-25-lts-i-openjdk-25"},"modified":"2025-09-17T11:12:01","modified_gmt":"2025-09-17T09:12:01","slug":"vypusk-java-se-25-lts-i-openjdk-25","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypusk-java-se-25-lts-i-openjdk-25","title":{"rendered":"Vyd\u00e1n\u00ed Java SE 25 LTS a OpenJDK 25","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po \u0161esti m\u011bs\u00edc\u00edch v\u00fdvoje spole\u010dnost Oracle zve\u0159ejnila platformu Java SE 25 (Java Platform, Standard Edition 24), jako referen\u010dn\u00ed implementaci, kter\u00e1 vyu\u017e\u00edv\u00e1 otev\u0159en\u00fd projekt OpenJDK. S v\u00fdjimkou odstran\u011bn\u00ed n\u011bkter\u00fdch zastaral\u00fdch funkc\u00ed zachov\u00e1v\u00e1 Java SE 25 zp\u011btnou kompatibilitu s p\u0159edchoz\u00edmi verzemi platformy Java \u2014 v\u011bt\u0161ina d\u0159\u00edve napsan\u00fdch Java projekt\u016f bez zm\u011bn bude fungovat na nov\u00e9 verzi. Sestavy Java SE 25 (JDK, JRE a Server JRE) jsou p\u0159ipraveny pro Linux (x86_64, AArch64), Windows (x86_64) a macOS (x86_64, AArch64). Referen\u010dn\u00ed implementace Java SE 25 vyvinut\u00e1 v r\u00e1mci projektu OpenJDK je pln\u011b otev\u0159en\u00e1 pod licenc\u00ed GPLv2 s v\u00fdjimkami GNU ClassPath, kter\u00e9 povoluj\u00ed dynamick\u00e9 vazby na komer\u010dn\u00ed produkty.     <\/p>\n<p>Java SE 25 je za\u0159azena mezi verze s roz\u0161\u00ed\u0159enou podporou, aktualizace pro tuto verzi budou vyd\u00e1v\u00e1ny do roku 2033 (ve\u0159ejn\u00e9 aktualizace budou vych\u00e1zet do z\u00e1\u0159\u00ed 2030). Jako verze s dlouhou podporou (LTS) jsou d\u00e1le podporov\u00e1ny tak\u00e9 verze Java SE 17 a 21, pro kter\u00e9 aktualizace budou vyd\u00e1v\u00e1ny do let 2029 a 2031, resp. (ve\u0159ejn\u00e9 \u2014 do let 2026 a 2028). Roz\u0161\u00ed\u0159en\u00e1 podpora LTS verz\u00ed Java SE 8 a 11 potrv\u00e1 do let 2030 a 2032.     <\/p>\n<p>Mezi novinkami nab\u00edzen\u00fdmi v Java SE 25 (1, 2, 3, 4):   <\/p>\n<ul>\n<li class=\"l\"> Bylo p\u0159id\u00e1no experiment\u00e1ln\u00ed API StableValue pro pr\u00e1ci s objekty, kter\u00e9 obsahuj\u00ed nem\u011bnn\u00e9 \u00fadaje a jsou zpracov\u00e1v\u00e1ny v JVM jako konstanty. Na tyto objekty se vztahuj\u00ed v\u00fdkonnostn\u00ed optimalizace podobn\u00e9 pol\u00edm s kl\u00ed\u010dov\u00fdm slovem \u201efinal\u201c. API StableValue odd\u011bluje vytv\u00e1\u0159en\u00ed trval\u00fdch hodnot a jejich inicializaci, zaru\u010duje, \u017ee hodnota m\u016f\u017ee b\u00fdt inicializov\u00e1na pouze jednou, zkracuje dobu spu\u0161t\u011bn\u00ed program\u016f a umo\u017e\u0148uje uplatn\u011bn\u00ed optimalizac\u00ed zkracov\u00e1n\u00ed konstant (constant-folding) v u\u017eivatelsk\u00e9m k\u00f3du, kter\u00e9 byly d\u0159\u00edve pou\u017e\u00edv\u00e1ny pouze ve vnit\u0159n\u00edm k\u00f3du JDK.       class Application {         \/\/ Bylo:         \/\/ static final UserService USERS = new UserService();         \/\/ Stalo:         static final StableValue USERS = StableValue.of();           public static UserService users() {            return USERS.orElseSet(UserService::new);         }      }\n<li class=\"l\"> Byl p\u0159id\u00e1n experiment\u00e1ln\u00ed API pro k\u00f3dov\u00e1n\u00ed a dek\u00f3dov\u00e1n\u00ed objekt\u016f s kryptografick\u00fdmi kl\u00ed\u010di, certifik\u00e1ty a seznamy odvolan\u00fdch certifik\u00e1t\u016f, pou\u017e\u00edvaj\u00edc\u00ed form\u00e1t PEM (Privacy-Enhanced Mail).\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora ohrani\u010den\u00fdch hodnot (Scoped Values), kter\u00e9 umo\u017e\u0148uj\u00ed sd\u00edlen\u00ed nem\u011bnn\u00fdch dat v vl\u00e1knov\u00fdch procesech a efektivn\u00ed v\u00fdm\u011bnu dat mezi podvl\u00e1kny (hodnoty jsou d\u011bd\u011bny). Scoped Values se vyv\u00edjej\u00ed jako n\u00e1hrada mechanismu prom\u011bnn\u00fdch lok\u00e1ln\u00edch pro vl\u00e1kno (thread-local variables) a jsou \u00fa\u010dinn\u011bj\u0161\u00ed p\u0159i pou\u017eit\u00ed velk\u00e9ho mno\u017estv\u00ed virtu\u00e1ln\u00edch vl\u00e1ken (tis\u00edce a miliony vl\u00e1ken). Hlavn\u00ed rozd\u00edl mezi Scoped Values a prom\u011bnn\u00fdmi lok\u00e1ln\u00edmi pro vl\u00e1kno spo\u010d\u00edv\u00e1 v tom, \u017ee prvn\u00ed se zapisuj\u00ed jednou, pot\u00e9 ji\u017e nemohou b\u00fdt zm\u011bn\u011bny a z\u016fst\u00e1vaj\u00ed dostupn\u00e9 pouze b\u011bhem b\u011bhu vl\u00e1kna.\n<li class=\"l\"> Bylo p\u0159id\u00e1no API pro pou\u017eit\u00ed kryptografick\u00fdch funkc\u00ed generov\u00e1n\u00ed kl\u00ed\u010d\u016f (KDF, key derivation function), kter\u00e9 umo\u017e\u0148uj\u00ed vytvo\u0159en\u00ed dal\u0161\u00edch kl\u00ed\u010d\u016f po\u017eadovan\u00e9 d\u00e9lky na z\u00e1klad\u011b tajn\u00e9ho kl\u00ed\u010de (nap\u0159\u00edklad hesla) a libovoln\u00e9 mno\u017einy dat.\n<li class=\"l\"> Byl odstran\u011bn k\u00f3d a skripty pro podporu 32bitov\u00fdch syst\u00e9m\u016f x86. Ukon\u010den\u00ed podpory 32bitov\u00fdch syst\u00e9m\u016f x86 umo\u017enilo zjednodu\u0161en\u00ed infrastruktury pro sestavov\u00e1n\u00ed a testov\u00e1n\u00ed JDK, stejn\u011b jako implementaci funkc\u00ed z\u00e1visl\u00fdch na platform\u00e1ch bez nutnosti vytv\u00e1\u0159et fallback zpracovatele pro 32bitov\u00e9 syst\u00e9my x86.\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost pou\u017eit\u00ed jednoho v\u00fdrazu \u201eimport module M\u201c k importu v\u0161ech bal\u00ed\u010dk\u016f exportovan\u00fdch uveden\u00fdm modulem najednou. Tato zm\u011bna v\u00fdrazn\u011b zjednodu\u0161uje op\u011btovn\u00e9 pou\u017eit\u00ed modulov\u00fdch knihoven, co\u017e umo\u017e\u0148uje p\u0159ipojen\u00ed knihoven a t\u0159\u00edd bez ur\u010den\u00ed jejich m\u00edsta v hierarchii bal\u00ed\u010dk\u016f. Nap\u0159\u00edklad uveden\u00edm \u201eimport module java.base\u201c dojde k importu v\u0161ech 54 bal\u00ed\u010dk\u016f, kter\u00e9 pat\u0159\u00ed do modulu java.base, kter\u00e9 by d\u0159\u00edve musely b\u00fdt uv\u00e1d\u011bny jednotliv\u011b (\u201eimport java.io.*\u201c, \u201eimport java.util.*\u201c atd.).\n<li class=\"l\"> Byla navr\u017eena kompaktn\u00ed varianta uspo\u0159\u00e1d\u00e1n\u00ed program\u016f, kter\u00e1 m\u016f\u017ee b\u00fdt u\u017eite\u010dn\u00e1 pro vzd\u011bl\u00e1v\u00e1n\u00ed a p\u0159i v\u00fdvoji mal\u00fdch aplikac\u00ed. V kompaktn\u00ed form\u011b nen\u00ed zapot\u0159eb\u00ed definov\u00e1n\u00ed zbyte\u010dn\u00fdch t\u0159\u00edd, typick\u00e9 API se automaticky importuj\u00ed a jsou dostupn\u00e9 zjednodu\u0161en\u00e9 metody vstupu \/ v\u00fdstupu. Nap\u0159\u00edklad aplikaci \u201eHello, World!\u201c lze zjednodu\u0161it na:       void main() {         IO.println(\u201eHello, World!\u201c);     }\n<li class=\"l\"> Bylo povoleno uv\u00e1d\u011bn\u00ed v\u00fdraz\u016f v konstruktoru p\u0159ed vol\u00e1n\u00edm super(\u2026), kter\u00e9 se pou\u017e\u00edv\u00e1 pro explicitn\u00ed vol\u00e1n\u00ed konstruktoru nad\u0159azen\u00e9 t\u0159\u00eddy z konstruktoru d\u011bd\u011bn\u00e9 t\u0159\u00eddy, pokud se tyto v\u00fdrazy neodkazuj\u00ed na objekt, kter\u00fd konstruktor vytv\u00e1\u0159\u00ed.       class Outer {         void hello() {             System.out.println(\u201eHello\u201c);         }         class Inner {             Inner() {                 hello();                 super();             }         }     }\n<li class=\"l\"> Byl p\u0159id\u00e1n generativn\u00ed re\u017eim progarbage collector Shenandoah, kdy jsou Star\u00e9 a Nov\u00e9 objekty zpracov\u00e1v\u00e1ny odd\u011blen\u011b pro zv\u00fd\u0161en\u00ed efektivity \u010di\u0161t\u011bn\u00ed objekt\u016f s kr\u00e1tkou \u017eivotnost\u00ed. Nov\u00fd re\u017eim zaji\u0161\u0165uje p\u0159edv\u00eddateln\u011bj\u0161\u00ed propustnost, odolnost v\u016f\u010di zm\u011bn\u00e1m z\u00e1t\u011b\u017ee a sn\u00ed\u017een\u00ed spot\u0159eby pam\u011bti p\u0159i sb\u011bru odpadu. Pl\u00e1nova\u010d Shenandoah se zam\u011b\u0159uje na zkr\u00e1cen\u00ed doby zastaven\u00ed b\u011bhem sb\u011bru odpadu prov\u00e1d\u011bn\u00edm v\u011bt\u0161\u00edho objemu pr\u00e1ce paraleln\u011b s prov\u00e1d\u011bn\u00edm Java aplikac\u00ed.\n<li class=\"l\"> Bylo zjednodu\u0161eno vytv\u00e1\u0159en\u00ed cache pro p\u0159edb\u011b\u017en\u00e9 (Ahead-of-Time) na\u010d\u00edt\u00e1n\u00ed a seskupov\u00e1n\u00ed t\u0159\u00edd, co\u017e umo\u017e\u0148uje urychlit spu\u0161t\u011bn\u00ed HotSpot JVM d\u00edky vyu\u017eit\u00ed t\u0159\u00edd ji\u017e v na\u010dten\u00e9m a sestaven\u00e9m stavu. P\u0159i spu\u0161t\u011bn\u00ed ji\u017e nejsou pot\u0159ebn\u00e9 samostatn\u00e9 operace pro zaznamen\u00e1n\u00ed aktivity a vytvo\u0159en\u00ed cache, sta\u010d\u00ed jeden p\u0159\u00edkaz:       java -XX:AOTCacheOutput=app.aot -cp app.jar com.example.App \u2026\n<li class=\"l\"> P\u0159i spu\u0161t\u011bn\u00ed HotSpot Java VM byla implementov\u00e1na mo\u017enost vyu\u017eit\u00ed profil\u016f vykon\u00e1v\u00e1n\u00ed metod, z\u00edskan\u00fdch p\u0159i p\u0159edchoz\u00edm spu\u0161t\u011bn\u00ed aplikace. Tato zm\u011bna umo\u017e\u0148uje JIT kompil\u00e1toru obej\u00edt se bez shroma\u017e\u010fov\u00e1n\u00ed statistik a okam\u017eit\u011b za\u010d\u00edt generovat nativn\u00ed k\u00f3d bez \u010dek\u00e1n\u00ed na vytvo\u0159en\u00ed profilu.\n<li class=\"l\"> V HotSpot JVM byla implementov\u00e1na podpora kompaktn\u00edch hlavi\u010dek objekt\u016f, jejich\u017e velikost na 64bitov\u00fdch syst\u00e9mech byla sn\u00ed\u017eena z 96 na 64 bit\u016f (z 12 na 8 bajt\u016f). Sn\u00ed\u017een\u00ed velikosti hlavi\u010dek umo\u017e\u0148uje zmen\u0161it velikost heapu a zv\u00fd\u0161it efektivitu pr\u00e1ce cache.\n<li class=\"l\"> Byla navr\u017eena testovac\u00ed implementace API Vector, kter\u00e1 poskytuje funkce pro vektorov\u00e9 v\u00fdpo\u010dty prov\u00e1d\u011bn\u00e9 pomoc\u00ed vektorov\u00fdch instrukc\u00ed procesor\u016f x86_64 a AArch64 a umo\u017e\u0148uje aplikovat operace na v\u00edce hodnot\u00e1ch sou\u010dasn\u011b (SIMD). Na rozd\u00edl od automatizovan\u00e9 vektoriza\u010dn\u00ed funkce skalarov\u00fdch operac\u00ed v JIT kompil\u00e1toru HotSpot, nov\u00e9 API umo\u017e\u0148uje explicitn\u011b \u0159\u00eddit vektoriza\u010dn\u00ed proces pro paraleln\u00ed zpracov\u00e1n\u00ed dat.\n<li class=\"l\"> Byl navr\u017een pro testov\u00e1n\u00ed p\u00e1t\u00fd p\u0159edb\u011b\u017en\u00fd n\u00e1vrh API pro strukturovanou konkurenci, kter\u00fd usnad\u0148uje v\u00fdvoj v\u00edcethreadov\u00fdch aplikac\u00ed zpracov\u00e1n\u00edm n\u011bkolika \u00faloh, kter\u00e9 b\u011b\u017e\u00ed v r\u016fzn\u00fdch vl\u00e1knech, jako jednotn\u00e9ho bloku.\n<li class=\"l\"> V mechanismu pattern matching byla navr\u017eena t\u0159et\u00ed p\u0159edb\u011b\u017en\u00e1 varianta umo\u017e\u0148uj\u00edc\u00ed pou\u017eit\u00ed primitivn\u00edch typ\u016f (int, byte, char a dal\u0161\u00ed z\u00e1kladn\u00ed typy, kter\u00e9 nejsou objekty) ve v\u0161ech typech \u0161ablon, v oper\u00e1toru \u201einstanceof\u201c a v bloc\u00edch \u201eswitch\u201c.         switch (x.getStatus()) {         case 0 -&gt; \u201eokay\u201c;         case 1 -&gt; \u201ewarning\u201c;         case 2 -&gt; \u201eerror\u201c;         case int i -&gt; \u201eunknown status: \u201e + i;     }     if (i instanceof byte b) {      \u2026 b \u2026     }\n<li class=\"l\"> Do JDK Flight Recorder (JFR) byla p\u0159id\u00e1na experiment\u00e1ln\u00ed podpora profilov\u00e1n\u00ed s p\u0159esn\u011bj\u0161\u00edm sledov\u00e1n\u00edm spot\u0159eby prost\u0159edk\u016f CPU na platform\u011b Linux. Informace o dob\u011b prov\u00e1d\u011bn\u00ed r\u016fzn\u00fdch konstrukc\u00ed mohou b\u00fdt vizu\u00e1ln\u011b zobrazeny pomoc\u00ed barevn\u00fdch diagram\u016f \u201eFlameGraph\u201c.\n<li class=\"l\"> Byla zv\u00fd\u0161ena stabilita JDK Flight Recorder (JFR) p\u0159i asynchronn\u00edm vzorkov\u00e1n\u00ed z\u00e1sobn\u00edk\u016f vl\u00e1ken Java d\u00edky obchodu se z\u00e1sobn\u00edkem vol\u00e1n\u00ed pouze \u201ebezpe\u010dn\u00fdmi m\u00edsty\u201c (safepoints).\n<li class=\"l\"> Do JDK Flight Recorder (JFR) byly p\u0159id\u00e1ny n\u00e1stroje pro sledov\u00e1n\u00ed a hodnocen\u00ed doby b\u011bhu metod. Podporuje sledov\u00e1n\u00ed z\u00e1sobn\u00edku vol\u00e1n\u00ed konkr\u00e9tn\u00edch metod a shroma\u017e\u010fov\u00e1n\u00ed p\u0159esn\u00e9 statistiky o vol\u00e1n\u00ed metod, zahrnuj\u00edc\u00ed takov\u00e9 metriky jako doba b\u011bhu a po\u010det vol\u00e1n\u00ed.              <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63895\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0448\u0435\u0441\u0442\u0438 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Oracle \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0443 Java SE 25 (Java Platform, Standard Edition 24), \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 OpenJDK. \u0417\u0430 \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0430\u0440\u0435\u0432\u0448\u0438\u0445 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0435\u0439 \u0432 Java SE 25 \u0441\u043e\u0445\u0440\u0430\u043d\u0435\u043d\u0430 \u043e\u0431\u0440\u0430\u0442\u043d\u0430\u044f \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c \u0441 \u043f\u0440\u043e\u0448\u043b\u044b\u043c\u0438 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u043c\u0438 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b Java &#8212; \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u0440\u0430\u043d\u0435\u0435 \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u0445 Java-\u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432 \u0431\u0435\u0437 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0431\u0443\u0434\u0443\u0442 \u0440\u0430\u0431\u043e\u0442\u043e\u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435 \u043f\u043e\u0434 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-143670","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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