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News, Technical discussions, research papers and assorted things of interest related to the Java programming language NO programming help, NO learning Java related questions, NO installing or downloading Java questions, NO JVM languages - Exclusively Java
2017年末において、Oracle JDK と OpenJDKに性能差はあるのか？ - Qiita
過去も、Oracle JDKとOpenJDKを比較する記事は多々ありました。 当時も、両者はだいたい一緒だし「将来的に両者の差分はなくなる」とした資料(PDF)もありました。 また、CPU アーキテクチャの違い、つまりIntelとARM上での性能差を示すこんな記事が過去にはありました。 そして、2017年も末、様々な動きがOracle JDK とOpenJDKにあります。 さて、今日においても Oracle JDK とOpenJDKに、性能の差はあるのでしょうか? 検証してみます。コードはこちらです。 Spring BootによるRest API アプリケーションで、テストコードでデータを1000回CRUD（作成して、参照して、変更して、削除）しています。 Oracle OpenJDKそれぞれ5回、系10回ぐらい計測してみます。 使用するJDKのバージョンは1.8.0_152、 Oracl
Tracking Down Native Memory Leaks in Elasticsearch
Search and analytics, data ingestion, and visualization – all at your fingertips.
Machine Learning for Elasticsearch
Search and analytics, data ingestion, and visualization – all at your fingertips.
We are out of memory (or: Why systemd process limits ruined my day)
Search and analytics, data ingestion, and visualization – all at your fingertips.
JSR 330: Dependency Injection for Java
Updates to the Original JSR The following updates have been made to the original proposal. 2015.01.09 Maintenance Lead: Bob Lee E-Mail Address: crazybob@crazybob.org Telephone Number: +1 314 537 6570 Fax Number: +1 650 253 0000 2010.03.01 Maintenance Leads: Bob Lee, VMWare Representatives: Bob Lee, Rod Johnson E-Mail Address: crazybob@crazybob.org, rod.johnson@vmware.com Telephone Number: +1 314 5
Concurrent Mark Sweep (CMS) Collector
Java Platform, Standard Edition HotSpot Virtual Machine Garbage Collection Tuning Guide Contents Previous Next The Concurrent Mark Sweep (CMS) collector is designed for applications that prefer shorter garbage collection pauses and that can afford to share processor resources with the garbage collector while the application is running. Typically applications that have a relatively large set of lon
Java Platform Standard Edition 8 Documentation
Oracle has two products that implement Java Platform Standard Edition (Java SE) 8: Java SE Development Kit (JDK) 8 and Java SE Runtime Environment (JRE) 8. JDK 8 is a superset of JRE 8, and contains everything that is in JRE 8, plus tools such as the compilers and debuggers necessary for developing applets and applications. JRE 8 provides the libraries, the Java Virtual Machine (JVM), and other co
jstat
Monitors Java Virtual Machine (JVM) statistics. This command is experimental and unsupported. Synopsis jstat [ generalOption | outputOptions vmid [ interval[s|ms] [ count ] ] generalOption A single general command-line option -help or -options. See General Options. outputOptions One or more output options that consist of a single statOption, plus any of the -t, -h, and -J options. See Output Optio
JDK9 新機能 (日本語＆ショートバージョン) #jjug
4. What features will come? 102: Process API Updates 110: HTTP 2 Client 143: Improve Contended Locking 158: Unified JVM Logging 165: Compiler Control 193: Variable Handles 197: Segmented Code Cache 199: Smart Java Compilation, Phase Two 201: Modular Source Code 211: Elide Deprecation Warnings on Import Statements 212: Resolve Lint and Doclint Warnings 213: Milling Project Coin 214: Remove GC Combi
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Download ZuluFX OpenJFX With OpenJDK Windows Linux macOS
GitHub - jmxtrans/jmxtrans: jmxtrans
Debugging Java Native Memory Leaks (evanjones.ca)
Expose metrics via JMX by kohsuke · Pull Request #26 · jenkinsci/metrics-plugin
GitHub - aragozin/jvm-tools: Small set of tools for JVM troublshooting, monitoring and profiling.
JEP 167: Event-Based JVM Tracing
Sizing the Generations
Overview of Java SE Monitoring and Management - Java SE Monitoring and Management Guide
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Application Performance Monitoring | Splunk
