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Java

java?? ??

Prometheus ? Grafana? Java ?? ????? ?????? ??

prometheusandgrafana? ?? Tomonitorajavaapplication, firstmentinstrumentThumentHeAppusingMicrometicer-Bometherometer -PrometheUsAndSpringBootactuatordencies, agexposeThe/actuator/prometheusDPointViaconFigurationInapplication.yml.2.setUpprometheus

Jul 31, 2025 am 09:42 AM

java ?? ??

Java 21? ??? ?? : ??? ? ???

Virtualthreads (?? ??)? I/O ??? ? ??? ??? ? ??? ?? ?????? ?? ??????. 2. ??? ? ??? ? (?? ??)? ?? ???? ??? ?? ?? ??? ???? ??? ??????. 3. StringTemplates (???? ??)? string.format? ???? ??? ??? ??? ? ??? ?????. 4. ??? ??? API (?? ??) getfirst ? Reversed? ?? ?? ? ?? ?? ??; 5. ?? ??? ???? ScopedValues, RecordPatterns ? GeneralZGC? ?????. ??? ?? ?????

Jul 31, 2025 am 09:32 AM

Java? ?? : ???? ??

Java? ?? ?? ???? ??? ?????. 1. LTS ??? ???? ? ??? ??? ?? Java17 ? Java21? ?? ?? ?? ??? ?????. 2. ProjectLoom? ??? ??? ?? ????? ????? ??? ????? ?? ?? ???? ?????. 3. ?? ??? ??? ?? Graalvm, Quarkus ? ?? ??? ?? ???? ???? ? ???? ??? ??? ??????. 4. ?? ? ??? ????? ?? ??? ???, ?? ??, ?? ??? ?? ?? ?? ?? ??? ?? ?????. 5. Kotlin ? Scala? ?? JVM ??? ?? ???? ????? Java? ??? ?? ?? ???? ?????? ??? ??? ? ??? ???? ????. ????? Java? ???? ??? ?? ?????? ?? ? ? ??? ???? ????.

Jul 31, 2025 am 09:21 AM

Spring Security ? JWT? Java Rest API? ?????

SpringBoot ?? ?????? JWT ?? RESTAPI ?? ???? ??, ?? ??? ??? ??? ? ? JWT? ????? ?? ???????. ?????? ?? ??? ?? ??? ??? ???? ??? ??? ?? ??? ?? ??? ???? ?????. 2. POM.XML? ??? ?? ??? ??, ??? ?? ??? -WEB ? JJWT-API, JJWT-IMPL ? JJWT-JACKSON ??? ??; 3. ??? ?? ??, ?? ??, ?? ?? ? ??? ???? JWTUTIL ?? ???? ??, ?? ?? ? JWT? ??????.

Jul 31, 2025 am 09:13 AM

Google Cloud ????? ?? ??? Java ?? ???? ??

chooSTHETHIGHTCOMPUTESERVICE — USEGKEFORMICROSERVICES, CLOUDRUNFORSTATELESSAPPS, ORAPPENGINEFORSIMPLICITY ? AUTOMATEDESWITHCLOUDBUILD.2.LEVERAGEMANAGEDSERVICESLIKECLOUDSQL, FIRESTORE, PUB/SUB ? CLOUDSTORAGETOREATIONOPERANCEPERHEADUNDE

Jul 31, 2025 am 09:11 AM

Java? ???? ??? ?? ??

RaceConditionsoccurcurcurcurcurcurs? MultipleThreadsAccesssharedData, leadingtoinconsistrencies; fixwithsynchronized, atomicinteger, orreentrantlock.2.deadlockariseswaitInteForeachEachother'Slocks;

Jul 31, 2025 am 09:09 AM

???? Java 'OutofMemoryError'???? ?? ??

java.lang.outofMemoryError : javaheapspace? ? ???? ???? ? ??, ??? ?? ? ? ??? ??? ???? ? ?? ?? ??? ?? ??? ??? ????????. 2. Metaspace ??? ??? ??? ?? ???? ?? ?? ??? ?? ?? ? ???? ????? MaxMetaspacesize? ???? ?????? ????????. 3. UnableTocreatenewnativeThread ?? ??? ??? ???? ?? ??? ?? ???? ??? ?? ???? ?? ??? ???????. 4. GCOVERHEADLIMITEXCEDED? GC? ????? ???? ??? GC ??? ???? ????? ?? ?????.

Jul 31, 2025 am 09:07 AM

java

?? Java ?? ??? ???? ??

??? JDK (?? Java17Lts ??, Eclipsetemurin? ?? ??? ??? ???? ??), Java_home ? Path Environment ??? ???? Java Version ? Javac-Version Verification? ??????. 2. ?? IDE (?? IntellijideAcommunity)? ???? ????, ?? ??? ? Lombok ? Sonarlint? ?? ??? ????? ??????. 3. ?? ?? Maven ?? Gradle? ???? ??? ? ???? ??? ??????. GradleWrapper? ????? Maven? ???? maven_home? ???? ?? ????. 4. GIT? ???? ??? ??? ??????

Jul 31, 2025 am 09:01 AM

??? ????? Java : ????? ? ?? ??

JavaisapracticalChoiceFordatascienceEnenterPriseandlarge-scaleenvironments.1.apacheCommonsMathProvidesMatheMaticalandStaticalToolSforCustomAlgorithms.2.wekaoffersAccorceRHESIVESOITEOFMLALGORITHMSADGUITOOLS, TIRCFORPROTOPYGIPING

Jul 31, 2025 am 08:10 AM

Quarkus??? ???? ???? Java ?? ????

quarkusisidealforcloud-nativejavaapplicationsduetoitscontainer-firstdesign, enablingfaststartup, lowmemoryusage ? seamlesskubernetesandserversintegration.1.ItusSbuild-timeOptimizationTomInimizerOntimeOverHead.2

Jul 31, 2025 am 08:06 AM

java Quarkus

Java ?????? ?? ??? ??? JPA

Mas 1. ??? ?? ???? @Query? ??? ??? ? ?? ??? ??? JPQL ? ?? SQL? ?????. DTO ?? ????? ??? ???? ?? []? ???? ?? ?? ??? ??? ?? ??-?? ??? ???? ?? ????. 2. ??? ??? pagable? ?? ???? ??????? n 1 ?? ??? ???????. JoinFetch ?? Projection? ?? ?? ???? ?????? ?????? ???? ??? ???? ? ????. 3. ?? ?? ?? ??? ?? jpaspecifica? ???????

Jul 31, 2025 am 07:54 AM

java

Java ??? ?? ? ?? ??

?? ??? ?? ???? ???? ??? ??? ???? ? ?????. Latch? ??? ?? ??? ???? ???? ????? ???? ? ?????. 1. ReintrantLock? ?? Lock? Lock () ? Unlock ()? ?? ??? ???? ???? ??, ?? ?? ?? ????? ??? ????, ?? ?? ???? ?? ??? ??? ????? ?????. 2. CountdownLatch? ?? Latch? Countdown () ? Await ()? ???? ???? ?????. ?? ?? ??? ??? ???? ?? ???? ?? ????? ???? ????? ?????. 3. ???? ???? ?? ??? ??? ?? ?? ??? ???? ???? ??? ???? ???? ????? ??? ??????. ? ??? ?? ??? ?????? ?? ?? ?????.

Jul 31, 2025 am 07:45 AM

Java?? ?? ?? ??

Javaisaviableandpracticalchoiceformachinelearning, ?? inenterpriseenvironments

Jul 31, 2025 am 07:43 AM

Visual Studio ??? ??? ?? ?? ??

vScodeisApowerful, LightweightaltaliveAtiveFormoderNJavadevelovent.1. SetupjavyInstallingjdk11, vscode ? thejavaextensionpackforfullToolingsUpport.2.beneffficodeedcoding, ??? ???, ???? ? ???? ??

Jul 31, 2025 am 07:23 AM