version0.16/index.html - www.eclipse.org/openj9/docs - Git at Google

 <!--
 * Copyright (c) 2017, 2021 IBM Corp. and others
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/legal/epl-2.0/ or the Apache
 * License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the
 * following Secondary Licenses when the conditions for such
 * availability set forth in the Eclipse Public License, v. 2.0
 * are satisfied: GNU General Public License, version 2 with
 * the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH
 * Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 -->


 <!DOCTYPE html>
 <html lang="en" class="no-js">
   <head>

       <meta charset="utf-8">
       <meta name="viewport" content="width=device-width,initial-scale=1">
       <meta http-equiv="x-ua-compatible" content="ie=edge">

         <meta name="description" content="Eclipse OpenJ9 documentation">


         <link rel="canonical" href="https://www.eclipse.org/openj9/docs/version0.16/">


         <meta name="lang:clipboard.copy" content="">

         <meta name="lang:clipboard.copied" content="">

         <meta name="lang:search.language" content="">

         <meta name="lang:search.pipeline.stopwords" content="">

         <meta name="lang:search.pipeline.trimmer" content="">

         <meta name="lang:search.result.none" content="">

         <meta name="lang:search.result.one" content="">

         <meta name="lang:search.result.other" content="">

         <meta name="lang:search.tokenizer" content="">

       <link rel="shortcut icon" href="../cr/oj9logo_img9.ico">
       <meta name="generator" content="mkdocs-1.0.4, mkdocs-material-3.0.4">


         <title>Version 0.16.0 -  </title>


       <link rel="stylesheet" href="../assets/stylesheets/application.1b62728e.css">

         <link rel="stylesheet" href="../assets/stylesheets/application-palette.a8b3c06d.css">


         <meta name="theme-color" content="#00bcd4">


       <script src="../assets/javascripts/modernizr.268332fc.js"></script>


         <link href="https://fonts.gstatic.com" rel="preconnect" crossorigin>
         <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700|Roboto+Mono">
         <style>body,input{font-family:"Roboto","Helvetica Neue",Helvetica,Arial,sans-serif}code,kbd,pre{font-family:"Roboto Mono","Courier New",Courier,monospace}</style>


     <link rel="stylesheet" href="../assets/fonts/material-icons.css">

     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">

       <link rel="stylesheet" href="../stylesheets/oj9.css">


 <!-- Google Tag Manager -->
 <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
 new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
 j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f (https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore%28j,f) );
 })(window,document,'script','dataLayer','GTM-5WLCZXC');</script>
 <!-- End Google Tag Manager -->
   </head>


     <body dir="" data-md-color-primary="cyan" data-md-color-accent="cyan">

     <svg class="md-svg">
       <defs>


           <svg xmlns="http://www.w3.org/2000/svg" width="416" height="448" viewBox="0 0 416 448" id="__github"><path fill="currentColor" d="M160 304q0 10-3.125 20.5t-10.75 19T128 352t-18.125-8.5-10.75-19T96 304t3.125-20.5 10.75-19T128 256t18.125 8.5 10.75 19T160 304zm160 0q0 10-3.125 20.5t-10.75 19T288 352t-18.125-8.5-10.75-19T256 304t3.125-20.5 10.75-19T288 256t18.125 8.5 10.75 19T320 304zm40 0q0-30-17.25-51T296 232q-10.25 0-48.75 5.25Q229.5 240 208 240t-39.25-2.75Q130.75 232 120 232q-29.5 0-46.75 21T56 304q0 22 8 38.375t20.25 25.75 30.5 15 35 7.375 37.25 1.75h42q20.5 0 37.25-1.75t35-7.375 30.5-15 20.25-25.75T360 304zm56-44q0 51.75-15.25 82.75-9.5 19.25-26.375 33.25t-35.25 21.5-42.5 11.875-42.875 5.5T212 416q-19.5 0-35.5-.75t-36.875-3.125-38.125-7.5-34.25-12.875T37 371.5t-21.5-28.75Q0 312 0 260q0-59.25 34-99-6.75-20.5-6.75-42.5 0-29 12.75-54.5 27 0 47.5 9.875t47.25 30.875Q171.5 96 212 96q37 0 70 8 26.25-20.5 46.75-30.25T376 64q12.75 25.5 12.75 54.5 0 21.75-6.75 42 34 40 34 99.5z"/></svg>

       </defs>
     </svg>
     <input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
     <input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
     <label class="md-overlay" data-md-component="overlay" for="__drawer"></label>

       <a href="../#whats-new-in-version-0160" tabindex="1" class="md-skip">

       </a>


       <!--
 * Copyright (c) 2017, 2021 IBM Corp. and others
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/legal/epl-2.0/ or the Apache
 * License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the
 * following Secondary Licenses when the conditions for such
 * availability set forth in the Eclipse Public License, v. 2.0
 * are satisfied: GNU General Public License, version 2 with
 * the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH
 * Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 -->
 <header class="md-header" data-md-component="header">
     <nav class="md-header-nav md-grid">
       <div class="md-flex">
         <div class="md-flex__cell md-flex__cell--shrink">
           <a href="https://www.eclipse.org/openj9/docs" title=" " class="md-header-nav__button md-logo">

               <img src="../cr/openj9_6b.png">

           </a>
         </div>
         <div class="md-flex__cell md-flex__cell--shrink">
           <label class="md-icon md-icon--menu md-header-nav__button" for="__drawer"></label>
         </div>
         <div class="md-flex__cell md-flex__cell--stretch">
           <div class="md-flex__ellipsis md-header-nav__title" data-md-component="title">
           </div>
         </div>
         <div class="md-flex__cell md-flex__cell--shrink">


               <label class="md-icon md-icon--search md-header-nav__button" for="search"></label>

 <div class="md-search" data-md-component="search" role="dialog">
   <label class="md-search__overlay" for="__search"></label>
   <div class="md-search__inner" role="search">
     <form class="md-search__form" name="search">
       <input type="text" class="md-search__input" name="query" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query" data-md-state="active">
       <label class="md-icon md-search__icon" for="__search"></label>
       <button type="reset" class="md-icon md-search__icon" data-md-component="reset" tabindex="-1">
         &#xE5CD;
       </button>
     </form>
     <div class="md-search__output">
       <div class="md-search__scrollwrap" data-md-scrollfix>
         <div class="md-search-result" data-md-component="result">
           <div class="md-search-result__meta">

           </div>
           <ol class="md-search-result__list"></ol>
         </div>
       </div>
     </div>
   </div>
 </div>


         </div>

           <div class="md-flex__cell md-flex__cell--shrink">
             <div class="md-header-nav__source">


 <a href="https://github.com/eclipse/openj9/" title="Go to repository" class="md-source" data-md-source="github">

     <div class="md-source__icon">
       <svg viewBox="0 0 24 24" width="24" height="24">
         <use xlink:href="#__github" width="24" height="24"></use>
       </svg>
     </div>

   <div class="md-source__repository">
     eclipse/openj9
   </div>
 </a>
             </div>
           </div>


       </div>
     </nav>
   </header>


     <div class="md-container">


       <main class="md-main">
         <div class="md-main__inner md-grid" data-md-component="container">


               <div class="md-sidebar md-sidebar--primary" data-md-component="navigation">
                 <div class="md-sidebar__scrollwrap">
                   <div class="md-sidebar__inner">
                     <nav class="md-nav md-nav--primary" data-md-level="0">
   <label class="md-nav__title md-nav__title--site" for="__drawer">
     <a href="https://www.eclipse.org/openj9/docs" title=" " class="md-nav__button md-logo">

         <img src="../cr/openj9_6b.png" width="48" height="48">

     </a>

   </label>

     <div class="md-nav__source">


 <a href="https://github.com/eclipse/openj9/" title="Go to repository" class="md-source" data-md-source="github">

     <div class="md-source__icon">
       <svg viewBox="0 0 24 24" width="24" height="24">
         <use xlink:href="#__github" width="24" height="24"></use>
       </svg>
     </div>

   <div class="md-source__repository">
     eclipse/openj9
   </div>
 </a>
     </div>

   <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href=".." title="About the docs" class="md-nav__link">
       About the docs
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../adoptopenjdk/" title="AdoptOpenJDK builds" class="md-nav__link">
       AdoptOpenJDK builds
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../introduction/" title="Getting started" class="md-nav__link">
       Getting started
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../openj9_newuser/" title="New to OpenJ9?" class="md-nav__link">
       New to OpenJ9?
     </a>
   </li>


   <li class="md-nav__item md-nav__item--active md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-5" type="checkbox" id="nav-5" checked>

     <label class="md-nav__link" for="nav-5">
       Release notes
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
       <label class="md-nav__title" for="nav-5">
         Release notes
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../openj9_releases/" title="Overview" class="md-nav__link">
       Overview
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.24/" title="Version 0.24.0" class="md-nav__link">
       Version 0.24.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.23/" title="Version 0.23.0" class="md-nav__link">
       Version 0.23.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.22/" title="Version 0.22.0" class="md-nav__link">
       Version 0.22.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.21/" title="Version 0.21.0" class="md-nav__link">
       Version 0.21.0
     </a>
   </li>


   <li class="md-nav__item md-nav__item--active md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-5-6" type="checkbox" id="nav-5-6" checked>

     <label class="md-nav__link" for="nav-5-6">
       Earlier releases
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-5-6">
         Earlier releases
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../version0.20/" title="Version 0.20.0" class="md-nav__link">
       Version 0.20.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.19/" title="Version 0.19.0" class="md-nav__link">
       Version 0.19.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.18/" title="Version 0.18.1" class="md-nav__link">
       Version 0.18.1
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.17/" title="Version 0.17.0" class="md-nav__link">
       Version 0.17.0
     </a>
   </li>


   <li class="md-nav__item md-nav__item--active">

     <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="__toc">


       <label class="md-nav__link md-nav__link--active" for="__toc">
         Version 0.16.0
       </label>

     <a href="./" title="Version 0.16.0" class="md-nav__link md-nav__link--active">
       Version 0.16.0
     </a>


 <nav class="md-nav md-nav--secondary">


     <label class="md-nav__title" for="__toc">On this page ...</label>
     <ul class="md-nav__list" data-md-scrollfix>

         <li class="md-nav__item">
   <a href="#features-and-changes" class="md-nav__link">
     Features and changes
   </a>

     <nav class="md-nav">
       <ul class="md-nav__list">

           <li class="md-nav__item">
   <a href="#binaries-and-supported-environments" class="md-nav__link">
     Binaries and supported environments
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#some-class-data-sharing-is-enabled-by-default" class="md-nav__link">
     Some class data sharing is enabled by default
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#automatic-setting-of-initial-heap-size-is-enabled-by-default" class="md-nav__link">
     Automatic setting of initial heap size is enabled by default
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#option-to-share-vm-anonymous-classes" class="md-nav__link">
     Option to share VM anonymous classes
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#performance-improvements-for-jvmti-watched-fields-on-power-systems" class="md-nav__link">
     Performance improvements for JVMTI watched fields on Power Systems
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#linux-on-x86-support-for-transparent-huge-pages-thp" class="md-nav__link">
     Linux&reg; on x86: Support for Transparent Huge Pages (THP)
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#new-jcmd-tool" class="md-nav__link">
     New jcmd tool
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#changes-to-the-shared-classes-cache-generation-number" class="md-nav__link">
     Changes to the shared classes cache generation number
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#the-xverifynone-and-noverify-options-are-deprecated" class="md-nav__link">
     The -Xverify:none and -noverify options are deprecated
   </a>

 </li>

       </ul>
     </nav>

 </li>

         <li class="md-nav__item">
   <a href="#full-release-information" class="md-nav__link">
     Full release information
   </a>

 </li>


     </ul>

 </nav>

   </li>


   <li class="md-nav__item">
     <a href="../version0.15/" title="Version 0.15.1" class="md-nav__link">
       Version 0.15.1
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.14/" title="Version 0.14.0" class="md-nav__link">
       Version 0.14.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.13/" title="Version 0.13.0" class="md-nav__link">
       Version 0.13.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.12/" title="Version 0.12.0" class="md-nav__link">
       Version 0.12.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.11/" title="Version 0.11.0" class="md-nav__link">
       Version 0.11.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.10/" title="Version 0.10.0" class="md-nav__link">
       Version 0.10.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.9/" title="Version 0.9.0" class="md-nav__link">
       Version 0.9.0
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../version0.8/" title="Version 0.8.0" class="md-nav__link">
       Version 0.8.0
     </a>
   </li>


       </ul>
     </nav>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-6" type="checkbox" id="nav-6">

     <label class="md-nav__link" for="nav-6">
       Memory management
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
       <label class="md-nav__title" for="nav-6">
         Memory management
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../gc_overview/" title="Overview" class="md-nav__link">
       Overview
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../gc/" title="Garbage collection policies" class="md-nav__link">
       Garbage collection policies
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item">
     <a href="../jit/" title="JIT Compiler" class="md-nav__link">
       JIT Compiler
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../jitserver/" title="JITServer (tech. preview)" class="md-nav__link">
       JITServer (tech. preview)
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../aot/" title="AOT Compiler" class="md-nav__link">
       AOT Compiler
     </a>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-10" type="checkbox" id="nav-10">

     <label class="md-nav__link" for="nav-10">
       Class data sharing
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
       <label class="md-nav__title" for="nav-10">
         Class data sharing
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../shrc/" title="Overview" class="md-nav__link">
       Overview
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../shrc_diag_util/" title="Diagnostic cache utilities" class="md-nav__link">
       Diagnostic cache utilities
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item">
     <a href="../attachapi/" title="Java Attach API" class="md-nav__link">
       Java Attach API
     </a>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-12" type="checkbox" id="nav-12">

     <label class="md-nav__link" for="nav-12">
       Diagnostics
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
       <label class="md-nav__title" for="nav-12">
         Diagnostics
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../diag_overview/" title="Overview" class="md-nav__link">
       Overview
     </a>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-12-2" type="checkbox" id="nav-12-2">

     <label class="md-nav__link" for="nav-12-2">
       Dumps
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-12-2">
         Dumps
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../dump_javadump/" title="Java dump" class="md-nav__link">
       Java dump
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dump_heapdump/" title="Heap dump" class="md-nav__link">
       Heap dump
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dump_systemdump/" title="System dump" class="md-nav__link">
       System dump
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-12-3" type="checkbox" id="nav-12-3">

     <label class="md-nav__link" for="nav-12-3">
       Tools
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-12-3">
         Tools
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../tool_jextract/" title="Dump extractor" class="md-nav__link">
       Dump extractor
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_jdmpview/" title="Dump viewer" class="md-nav__link">
       Dump viewer
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_traceformat/" title="Trace formatter" class="md-nav__link">
       Trace formatter
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_builder/" title="Option builder" class="md-nav__link">
       Option builder
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_jcmd/" title="Java command (jcmd) tool" class="md-nav__link">
       Java command (jcmd) tool
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_jmap/" title="Java memory map (jmap) tool" class="md-nav__link">
       Java memory map (jmap) tool
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_jps/" title="Java process status (jps)" class="md-nav__link">
       Java process status (jps)
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_jstack/" title="Java stack (jstack) tool" class="md-nav__link">
       Java stack (jstack) tool
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_jstat/" title="Java statistics monitoring (jstat) tool" class="md-nav__link">
       Java statistics monitoring (jstat) tool
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../tool_migration/" title="Switching to OpenJ9" class="md-nav__link">
       Switching to OpenJ9
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-12-4" type="checkbox" id="nav-12-4">

     <label class="md-nav__link" for="nav-12-4">
       Interfaces
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-12-4">
         Interfaces
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../interface_jvmti/" title="JVMTI" class="md-nav__link">
       JVMTI
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../interface_dtfj/" title="DTFJ" class="md-nav__link">
       DTFJ
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../interface_lang_management/" title="Language Management" class="md-nav__link">
       Language Management
     </a>
   </li>


       </ul>
     </nav>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-13" type="checkbox" id="nav-13">

     <label class="md-nav__link" for="nav-13">
       Command-line options
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
       <label class="md-nav__title" for="nav-13">
         Command-line options
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../cmdline_specifying/" title="Specifying options" class="md-nav__link">
       Specifying options
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../cmdline_general/" title="Standard options" class="md-nav__link">
       Standard options
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../cmdline_migration/" title="Switching to OpenJ9" class="md-nav__link">
       Switching to OpenJ9
     </a>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-13-4" type="checkbox" id="nav-13-4">

     <label class="md-nav__link" for="nav-13-4">
       System property options
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-13-4">
         System property options
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../d_jvm_commands/" title="Using System properties" class="md-nav__link">
       Using System properties
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmenableclasscaching/" title="-Dcom.ibm.enableClassCaching" class="md-nav__link">
       -Dcom.ibm.enableClassCaching
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmenablelegacydumpsecurity/" title="-Dcom.ibm.enableLegacyDumpSecurity" class="md-nav__link">
       -Dcom.ibm.enableLegacyDumpSecurity
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmenablelegacylogsecurity/" title="-Dcom.ibm.enableLegacyLogSecurity" class="md-nav__link">
       -Dcom.ibm.enableLegacyLogSecurity
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmenablelegacytracesecurity/" title="-Dcom.ibm.enableLegacyTraceSecurity" class="md-nav__link">
       -Dcom.ibm.enableLegacyTraceSecurity
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmgpudisable/" title="-Dcom.ibm.gpu.disable" class="md-nav__link">
       -Dcom.ibm.gpu.disable
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmgpuenable/" title="-Dcom.ibm.gpu.enable" class="md-nav__link">
       -Dcom.ibm.gpu.enable
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmgpuverbose/" title="-Dcom.ibm.gpu.verbose" class="md-nav__link">
       -Dcom.ibm.gpu.verbose
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmlangmanagementosmxbeaniscputime100ns/" title="-Dcom.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns" class="md-nav__link">
       -Dcom.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmlangmanagementverbose/" title="-Dcom.ibm.lang.management.verbose" class="md-nav__link">
       -Dcom.ibm.lang.management.verbose
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachcommand_timeout/" title="-Dcom.ibm.tools.attach.command_timeout" class="md-nav__link">
       -Dcom.ibm.tools.attach.command_timeout
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachdirectory/" title="-Dcom.ibm.tools.attach.directory" class="md-nav__link">
       -Dcom.ibm.tools.attach.directory
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachdisplayname/" title="-Dcom.ibm.tools.attach.displayName" class="md-nav__link">
       -Dcom.ibm.tools.attach.displayName
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachenable/" title="-Dcom.ibm.tools.attach.enable" class="md-nav__link">
       -Dcom.ibm.tools.attach.enable
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachid/" title="-Dcom.ibm.tools.attach.id" class="md-nav__link">
       -Dcom.ibm.tools.attach.id
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachlogging/" title="-Dcom.ibm.tools.attach.logging" class="md-nav__link">
       -Dcom.ibm.tools.attach.logging
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachlogname/" title="-Dcom.ibm.tools.attach.log.name" class="md-nav__link">
       -Dcom.ibm.tools.attach.log.name
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachshutdown_timeout/" title="-Dcom.ibm.tools.attach.shutdown_timeout" class="md-nav__link">
       -Dcom.ibm.tools.attach.shutdown_timeout
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dcomibmtoolsattachtimeout/" title="-Dcom.ibm.tools.attach.timeout" class="md-nav__link">
       -Dcom.ibm.tools.attach.timeout
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../dfileencoding/" title="-Dfile.encoding" class="md-nav__link">
       -Dfile.encoding
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djavacompiler/" title="-Djava.compiler" class="md-nav__link">
       -Djava.compiler
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djavalangstringsubstringnocopy/" title="-Djava.lang.string.substring.nocopy" class="md-nav__link">
       -Djava.lang.string.substring.nocopy
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djavalangstringbuffergrowaggressively/" title="-Djava.lang.stringBuffer.growAggressively" class="md-nav__link">
       -Djava.lang.stringBuffer.growAggressively
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djdknativecbc/" title="-Djdk.nativeCBC" class="md-nav__link">
       -Djdk.nativeCBC
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djdknativechacha20/" title="-Djdk.nativeChaCha20" class="md-nav__link">
       -Djdk.nativeChaCha20
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djdknativecrypto/" title="-Djdk.nativeCrypto" class="md-nav__link">
       -Djdk.nativeCrypto
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djdknativedigest/" title="-Djdk.nativeDigest" class="md-nav__link">
       -Djdk.nativeDigest
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djdknativegcm/" title="-Djdk.nativeGCM" class="md-nav__link">
       -Djdk.nativeGCM
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../djdknativersa/" title="-Djdk.nativeRSA" class="md-nav__link">
       -Djdk.nativeRSA
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-13-5" type="checkbox" id="nav-13-5">

     <label class="md-nav__link" for="nav-13-5">
       JVM -X options
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-13-5">
         JVM -X options
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../x_jvm_commands/" title="Using -X options" class="md-nav__link">
       Using -X options
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../x/" title="-X" class="md-nav__link">
       -X
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xaggressive/" title="-Xaggressive" class="md-nav__link">
       -Xaggressive
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xalwaysclassgc/" title="-Xalwaysclassgc" class="md-nav__link">
       -Xalwaysclassgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xaot/" title="-Xaot" class="md-nav__link">
       -Xaot
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xargencoding/" title="-Xargencoding" class="md-nav__link">
       -Xargencoding
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xbootclasspath/" title="-Xbootclasspath" class="md-nav__link">
       -Xbootclasspath
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xceehdlr/" title="-XCEEHDLR" class="md-nav__link">
       -XCEEHDLR
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcheck/" title="-Xcheck" class="md-nav__link">
       -Xcheck
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xclassgc/" title="-Xclassgc" class="md-nav__link">
       -Xclassgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcodecache/" title="-Xcodecache" class="md-nav__link">
       -Xcodecache
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcodecachetotal/" title="-Xcodecachetotal" class="md-nav__link">
       -Xcodecachetotal
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcomp/" title="-Xcomp" class="md-nav__link">
       -Xcomp
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcompactexplicitgc/" title="-Xcompactexplicitgc" class="md-nav__link">
       -Xcompactexplicitgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcompactgc/" title="-Xcompactgc" class="md-nav__link">
       -Xcompactgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcompilationthreads/" title="-XcompilationThreads" class="md-nav__link">
       -XcompilationThreads
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcompressedrefs/" title="-Xcompressedrefs" class="md-nav__link">
       -Xcompressedrefs
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xconcurrentbackground/" title="-Xconcurrentbackground" class="md-nav__link">
       -Xconcurrentbackground
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xconcurrentlevel/" title="-Xconcurrentlevel" class="md-nav__link">
       -Xconcurrentlevel
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xconcurrentslack/" title="-Xconcurrentslack" class="md-nav__link">
       -Xconcurrentslack
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xconmeter/" title="-Xconmeter" class="md-nav__link">
       -Xconmeter
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xenableexcessivegc/" title="-Xdisableexcessivegc" class="md-nav__link">
       -Xdisableexcessivegc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xenableexplicitgc/" title="-Xdisableexplicitgc" class="md-nav__link">
       -Xdisableexplicitgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xdisablejavadump/" title="-Xdisablejavadump" class="md-nav__link">
       -Xdisablejavadump
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xenablestringconstantgc/" title="-Xdisablestringconstantgc" class="md-nav__link">
       -Xdisablestringconstantgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xdump/" title="-Xdump" class="md-nav__link">
       -Xdump
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xenableexcessivegc/" title="-Xenableexcessivegc" class="md-nav__link">
       -Xenableexcessivegc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xenableexplicitgc/" title="-Xenableexplicitgc" class="md-nav__link">
       -Xenableexplicitgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xenablestringconstantgc/" title="-Xenablestringconstantgc" class="md-nav__link">
       -Xenablestringconstantgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xfastresolve/" title="-Xfastresolve" class="md-nav__link">
       -Xfastresolve
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xfuture/" title="-Xfuture" class="md-nav__link">
       -Xfuture
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xgc/" title="-Xgc" class="md-nav__link">
       -Xgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xgcsplitheap/" title="-Xgc:splitheap" class="md-nav__link">
       -Xgc:splitheap
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xgcpolicy/" title="-Xgcpolicy" class="md-nav__link">
       -Xgcpolicy
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xgcthreads/" title="-Xgcthreads" class="md-nav__link">
       -Xgcthreads
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xgcworkpackets/" title="-Xgcworkpackets" class="md-nav__link">
       -Xgcworkpackets
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xint/" title="-Xint" class="md-nav__link">
       -Xint
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xss/" title="-Xiss" class="md-nav__link">
       -Xiss
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xjit/" title="-Xjit" class="md-nav__link">
       -Xjit
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xjni/" title="-Xjni" class="md-nav__link">
       -Xjni
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlinenumbers/" title="-Xlinenumbers" class="md-nav__link">
       -Xlinenumbers
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xloa/" title="-Xloa" class="md-nav__link">
       -Xloa
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xloaminimum/" title="-Xloainitial" class="md-nav__link">
       -Xloainitial
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xloaminimum/" title="-Xloamaximum" class="md-nav__link">
       -Xloamaximum
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xloaminimum/" title="-Xloaminimum" class="md-nav__link">
       -Xloaminimum
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlockreservation/" title="-XlockReservation" class="md-nav__link">
       -XlockReservation
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlockword/" title="-Xlockword" class="md-nav__link">
       -Xlockword
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlog/" title="-Xlog" class="md-nav__link">
       -Xlog
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlp/" title="-Xlp" class="md-nav__link">
       -Xlp
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlpcodecache/" title="-Xlp:codecache" class="md-nav__link">
       -Xlp:codecache
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlpobjectheap/" title="-Xlp:objectheap" class="md-nav__link">
       -Xlp:objectheap
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmine/" title="-Xmaxe" class="md-nav__link">
       -Xmaxe
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xminf/" title="-Xmaxf" class="md-nav__link">
       -Xmaxf
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmint/" title="-Xmaxt" class="md-nav__link">
       -Xmaxt
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmca/" title="-Xmca" class="md-nav__link">
       -Xmca
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmca/" title="-Xmco" class="md-nav__link">
       -Xmco
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmcrs/" title="-Xmcrs" class="md-nav__link">
       -Xmcrs
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmine/" title="-Xmine" class="md-nav__link">
       -Xmine
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xminf/" title="-Xminf" class="md-nav__link">
       -Xminf
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmint/" title="-Xmint" class="md-nav__link">
       -Xmint
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmn/" title="-Xmn" class="md-nav__link">
       -Xmn
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmn/" title="-Xmns" class="md-nav__link">
       -Xmns
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmn/" title="-Xmnx" class="md-nav__link">
       -Xmnx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmo/" title="-Xmo" class="md-nav__link">
       -Xmo
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmo/" title="-Xmoi" class="md-nav__link">
       -Xmoi
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmo/" title="-Xmos" class="md-nav__link">
       -Xmos
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmo/" title="-Xmox" class="md-nav__link">
       -Xmox
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmr/" title="-Xmr" class="md-nav__link">
       -Xmr
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmr/" title="-Xmrx" class="md-nav__link">
       -Xmrx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xms/" title="-Xms" class="md-nav__link">
       -Xms
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xmso/" title="-Xmso" class="md-nav__link">
       -Xmso
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xms/" title="-Xmx" class="md-nav__link">
       -Xmx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xaot/" title="-Xnoaot" class="md-nav__link">
       -Xnoaot
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xclassgc/" title="-Xnoclassgc" class="md-nav__link">
       -Xnoclassgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcompactexplicitgc/" title="-Xnocompactexplicitgc" class="md-nav__link">
       -Xnocompactexplicitgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcompactgc/" title="-Xnocompactgc" class="md-nav__link">
       -Xnocompactgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xcompressedrefs/" title="-Xnocompressedrefs" class="md-nav__link">
       -Xnocompressedrefs
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xjit/" title="-Xnojit" class="md-nav__link">
       -Xnojit
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xlinenumbers/" title="-Xnolinenumbers" class="md-nav__link">
       -Xnolinenumbers
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xloa/" title="-Xnoloa" class="md-nav__link">
       -Xnoloa
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsigcatch/" title="-Xnosigcatch" class="md-nav__link">
       -Xnosigcatch
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsigchain/" title="-Xnosigchain" class="md-nav__link">
       -Xnosigchain
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xnumanone/" title="-Xnuma:none" class="md-nav__link">
       -Xnuma:none
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xoptionsfile/" title="-Xoptionsfile" class="md-nav__link">
       -Xoptionsfile
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xquickstart/" title="-Xquickstart" class="md-nav__link">
       -Xquickstart
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xrs/" title="-Xrs" class="md-nav__link">
       -Xrs
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsamplingexpirationtime/" title="-XsamplingExpirationTime" class="md-nav__link">
       -XsamplingExpirationTime
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscdmx/" title="-Xscdmx" class="md-nav__link">
       -Xscdmx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminaot/" title="-Xscmaxaot" class="md-nav__link">
       -Xscmaxaot
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminjitdata/" title="-Xscmaxjitdata" class="md-nav__link">
       -Xscmaxjitdata
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminaot/" title="-Xscminaot" class="md-nav__link">
       -Xscminaot
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscminjitdata/" title="-Xscminjitdata" class="md-nav__link">
       -Xscminjitdata
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xscmx/" title="-Xscmx" class="md-nav__link">
       -Xscmx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xshareclasses/" title="-Xshareclasses" class="md-nav__link">
       -Xshareclasses
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsigcatch/" title="-Xsigcatch" class="md-nav__link">
       -Xsigcatch
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsigchain/" title="-Xsigchain" class="md-nav__link">
       -Xsigchain
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsignal/" title="-Xsignal" class="md-nav__link">
       -Xsignal
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsoftmx/" title="-Xsoftmx" class="md-nav__link">
       -Xsoftmx
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsoftrefthreshold/" title="-Xsoftrefthreshold" class="md-nav__link">
       -Xsoftrefthreshold
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xss/" title="-Xss" class="md-nav__link">
       -Xss
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xss/" title="-Xssi" class="md-nav__link">
       -Xssi
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xsyslog/" title="-Xsyslog" class="md-nav__link">
       -Xsyslog
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xtgc/" title="-Xtgc" class="md-nav__link">
       -Xtgc
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xthr/" title="-Xthr" class="md-nav__link">
       -Xthr
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xtlhprefetch/" title="-XtlhPrefetch" class="md-nav__link">
       -XtlhPrefetch
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xtrace/" title="-Xtrace" class="md-nav__link">
       -Xtrace
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xtunevirtualized/" title="-Xtune:virtualized" class="md-nav__link">
       -Xtune:virtualized
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xverbosegclog/" title="-Xverbosegclog" class="md-nav__link">
       -Xverbosegclog
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xverify/" title="-Xverify" class="md-nav__link">
       -Xverify
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xzero/" title="-Xzero" class="md-nav__link">
       -Xzero
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-13-6" type="checkbox" id="nav-13-6">

     <label class="md-nav__link" for="nav-13-6">
       JVM -XX options
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-13-6">
         JVM -XX options
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../xx_jvm_commands/" title="Using -XX options" class="md-nav__link">
       Using -XX options
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxactiveprocessorcount/" title="-XXActiveProcessorCount" class="md-nav__link">
       -XXActiveProcessorCount
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxallowvmshutdown/" title="-XXallowvmshutdown" class="md-nav__link">
       -XXallowvmshutdown
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxalwayspretouch/" title="-XX:[+|-]AlwaysPreTouch" class="md-nav__link">
       -XX:[+|-]AlwaysPreTouch
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxclassrelationshipverifier/" title="-XX:[+|-]ClassRelationshipVerifier" class="md-nav__link">
       -XX:[+|-]ClassRelationshipVerifier
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxconcgcthreads/" title="-XX:ConcGCThreads" class="md-nav__link">
       -XX:ConcGCThreads
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxcodecachetotal/" title="-XX:codecachetotal" class="md-nav__link">
       -XX:codecachetotal
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxcompactstrings/" title="-XX:[+|-]CompactStrings" class="md-nav__link">
       -XX:[+|-]CompactStrings
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxdisableexplicitgc/" title="-XX:[+|-]DisableExplicitGC" class="md-nav__link">
       -XX:[+|-]DisableExplicitGC
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxdisclaimjitscratch/" title="-XX:[+|-]DisclaimJitScratch" class="md-nav__link">
       -XX:[+|-]DisclaimJitScratch
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxenablecpumonitor/" title="-XX:[+|-]EnableCPUMonitor" class="md-nav__link">
       -XX:[+|-]EnableCPUMonitor
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxexitonoutofmemoryerror/" title="-XX:[+|-]ExitOnOutOfMemoryError" class="md-nav__link">
       -XX:[+|-]ExitOnOutOfMemoryError
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxgloballockreservation/" title="-XX:[+|-]GlobalLockReservation" class="md-nav__link">
       -XX:[+|-]GlobalLockReservation
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxhandlesigxfsz/" title="-XX:[+|-]HandleSIGXFSZ" class="md-nav__link">
       -XX:[+|-]HandleSIGXFSZ
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxhandlesigabrt/" title="-XX:[+|-]HandleSIGABRT" class="md-nav__link">
       -XX:[+|-]HandleSIGABRT
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxheapdumponoutofmemory/" title="-XX:[+|-]HeapDumpOnOutOfMemory" class="md-nav__link">
       -XX:[+|-]HeapDumpOnOutOfMemory
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxheapdumppath/" title="-XX:HeapDumpPath" class="md-nav__link">
       -XX:HeapDumpPath
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxheapmanagementmxbeancompatibility/" title="-XX:[+|-]HeapManagementMXBeanCompatibility" class="md-nav__link">
       -XX:[+|-]HeapManagementMXBeanCompatibility
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxidletuningcompactonidle/" title="-XX:[+|-]IdleTuningCompactOnIdle" class="md-nav__link">
       -XX:[+|-]IdleTuningCompactOnIdle
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxidletuninggconidle/" title="-XX:[+|-]IdleTuningGcOnIdle" class="md-nav__link">
       -XX:[+|-]IdleTuningGcOnIdle
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxidletuningminfreeheaponidle/" title="-XX:IdleTuningMinFreeHeapOnIdle" class="md-nav__link">
       -XX:IdleTuningMinFreeHeapOnIdle
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxidletuningminidlewaittime/" title="-XX:IdleTuningMinIdleWaitTime" class="md-nav__link">
       -XX:IdleTuningMinIdleWaitTime
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxignoreunrecognizedvmoptions/" title="-XX:[+|-]IgnoreUnrecognizedVMOptions" class="md-nav__link">
       -XX:[+|-]IgnoreUnrecognizedVMOptions
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxignoreunrecognizedxxcolonoptions/" title="-XX:[+|-]IgnoreUnrecognizedXXColonOptions" class="md-nav__link">
       -XX:[+|-]IgnoreUnrecognizedXXColonOptions
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxinitialrampercentage/" title="-XX:InitialRAMPercentage" class="md-nav__link">
       -XX:InitialRAMPercentage
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxinitialheapsize/" title="-XX:InitialHeapSize" class="md-nav__link">
       -XX:InitialHeapSize
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxinterleavememory/" title="-XX:[+|-]InterleaveMemory" class="md-nav__link">
       -XX:[+|-]InterleaveMemory
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxjitinlinewatches/" title="-XX:[+|-]JITInlineWatches" class="md-nav__link">
       -XX:[+|-]JITInlineWatches
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxlazysymbolresolution/" title="-XX:[+|-]LazySymbolResolution" class="md-nav__link">
       -XX:[+|-]LazySymbolResolution
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxlegacyxlogoption/" title="-XX:[+|-]LegacyXLogOption" class="md-nav__link">
       -XX:[+|-]LegacyXLogOption
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxmaxdirectmemorysize/" title="-XX:MaxDirectMemorySize" class="md-nav__link">
       -XX:MaxDirectMemorySize
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxinitialheapsize/" title="-XX:MaxHeapSize" class="md-nav__link">
       -XX:MaxHeapSize
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxinitialrampercentage/" title="-XX:MaxRAMPercentage" class="md-nav__link">
       -XX:MaxRAMPercentage
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxonoutofmemoryerror/" title="-XX:OnOutOfMemoryError" class="md-nav__link">
       -XX:OnOutOfMemoryError
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxoriginaljdk8heapsizecompatibilitymode/" title="-XX:[+|-]OriginalJDK8HeapSizeCompatibilityMode" class="md-nav__link">
       -XX:[+|-]OriginalJDK8HeapSizeCompatibilityMode
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxnosuballoc32bitmem/" title="-XXnosuballoc32bitmem" class="md-nav__link">
       -XXnosuballoc32bitmem
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxpagealigndirectmemory/" title="-XX:[+|-]PageAlignDirectMemory" class="md-nav__link">
       -XX:[+|-]PageAlignDirectMemory
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxparallelcmsthreads/" title="-XX:ParallelCMSThreads" class="md-nav__link">
       -XX:ParallelCMSThreads
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxparallelgcthreads/" title="-XX:ParallelGCThreads" class="md-nav__link">
       -XX:ParallelGCThreads
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxportablesharedcache/" title="-XX:[+|-]PortableSharedCache" class="md-nav__link">
       -XX:[+|-]PortableSharedCache
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxpositiveidentityhash/" title="-XX:[+|-]PositiveIdentityHash" class="md-nav__link">
       -XX:[+|-]PositiveIdentityHash
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxprintcodecache/" title="-XX:[+|-]PrintCodeCache" class="md-nav__link">
       -XX:[+|-]PrintCodeCache
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxprintflagsfinal/" title="-XX:[+|-]PrintFlagsFinal" class="md-nav__link">
       -XX:[+|-]PrintFlagsFinal
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxreadipinfoforras/" title="-XX:[+|-]ReadIPInfoForRAS" class="md-nav__link">
       -XX:[+|-]ReadIPInfoForRAS
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxreducecpumonitoroverhead/" title="-XX:[+|-]ReduceCPUMonitorOverhead" class="md-nav__link">
       -XX:[+|-]ReduceCPUMonitorOverhead
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxruntimeinstrumentation/" title="-XX:[+|-]RuntimeInstrumentation" class="md-nav__link">
       -XX:[+|-]RuntimeInstrumentation
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxsethwprefetch/" title="-XXsetHWPrefetch" class="md-nav__link">
       -XXsetHWPrefetch
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxshareanonymousclasses/" title="-XX:[+|-]ShareAnonymousClasses" class="md-nav__link">
       -XX:[+|-]ShareAnonymousClasses
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxshareclassesenablebci/" title="-XX:ShareClassesDisableBCI" class="md-nav__link">
       -XX:ShareClassesDisableBCI
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxshareclassesenablebci/" title="-XX:ShareClassesEnableBCI" class="md-nav__link">
       -XX:ShareClassesEnableBCI
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxsharedcachehardlimit/" title="-XX:SharedCacheHardLimit" class="md-nav__link">
       -XX:SharedCacheHardLimit
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxshareunsafeclasses/" title="-XX:[+|-]ShareUnsafeClasses" class="md-nav__link">
       -XX:[+|-]ShareUnsafeClasses
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxstacktraceinthrowable/" title="-XX:-StackTraceInThrowable" class="md-nav__link">
       -XX:-StackTraceInThrowable
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxtransparenthugepage/" title="-XX:[+|-]TransparentHugePage" class="md-nav__link">
       -XX:[+|-]TransparentHugePage
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxusecompressedoops/" title="-XX:[+|-]UseCompressedOops" class="md-nav__link">
       -XX:[+|-]UseCompressedOops
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxusecontainersupport/" title="-XX:[+|-]UseContainerSupport" class="md-nav__link">
       -XX:[+|-]UseContainerSupport
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxusegcstartuphints/" title="-XX:[+|-]UseGCStartupHints" class="md-nav__link">
       -XX:[+|-]UseGCStartupHints
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxusenogc/" title="-XX:[+|-]UseNoGC" class="md-nav__link">
       -XX:[+|-]UseNoGC
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxverboseverification/" title="-XX:[+|-]VerboseVerification" class="md-nav__link">
       -XX:[+|-]VerboseVerification
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../xxvmlockclassloader/" title="-XX:[+|-]VMLockClassLoader" class="md-nav__link">
       -XX:[+|-]VMLockClassLoader
     </a>
   </li>


       </ul>
     </nav>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-14" type="checkbox" id="nav-14">

     <label class="md-nav__link" for="nav-14">
        Reference
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
       <label class="md-nav__title" for="nav-14">
          Reference
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../openj9_support/" title="Supported environments" class="md-nav__link">
       Supported environments
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../openj9_defaults/" title="Default settings" class="md-nav__link">
       Default settings
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../openj9_signals/" title="Signal handling" class="md-nav__link">
       Signal handling
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../openj9_directories/" title="Directory conventions" class="md-nav__link">
       Directory conventions
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../messages_intro/" title="OpenJ9 messages" class="md-nav__link">
       OpenJ9 messages
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../env_var/" title="Environment variables" class="md-nav__link">
       Environment variables
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-15" type="checkbox" id="nav-15">

     <label class="md-nav__link" for="nav-15">
       API documentation
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="1">
       <label class="md-nav__title" for="nav-15">
         API documentation
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../api-overview/" title="Overview" class="md-nav__link">
       Overview
     </a>
   </li>


   <li class="md-nav__item md-nav__item--nested">

       <input class="md-toggle md-nav__toggle" data-md-toggle="nav-15-2" type="checkbox" id="nav-15-2">

     <label class="md-nav__link" for="nav-15-2">
       Java 8 API
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="2">
       <label class="md-nav__title" for="nav-15-2">
         Java 8 API
       </label>
       <ul class="md-nav__list" data-md-scrollfix>


   <li class="md-nav__item">
     <a href="../api-conditionhandling/" title="Condition exception handling" class="md-nav__link">
       Condition exception handling
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../api-cuda/" title="CUDA4J" class="md-nav__link">
       CUDA4J
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../api-daa/" title="Data access acceleration" class="md-nav__link">
       Data access acceleration
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../api-dtfj/" title="DTFJ" class="md-nav__link">
       DTFJ
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../api-gpu/" title="GPU" class="md-nav__link">
       GPU
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../api-jvm/" title="JVM diagnostic utilities" class="md-nav__link">
       JVM diagnostic utilities
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../api-langmgmt/" title="Monitoring and management" class="md-nav__link">
       Monitoring and management
     </a>
   </li>


   <li class="md-nav__item">
     <a href="../api-shrc/" title="Shared classes" class="md-nav__link">
       Shared classes
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item">
     <a href="../api-jdk11/" title="Java 11 API" class="md-nav__link">
       Java 11 API
     </a>
   </li>


       </ul>
     </nav>
   </li>


   <li class="md-nav__item">
     <a href="../legal/" title="Legal" class="md-nav__link">
       Legal
     </a>
   </li>


   </ul>
 </nav>
                   </div>
                 </div>
               </div>


               <div class="md-sidebar md-sidebar--secondary" data-md-component="toc">
                 <div class="md-sidebar__scrollwrap">
                   <div class="md-sidebar__inner">

 <nav class="md-nav md-nav--secondary">


     <label class="md-nav__title" for="__toc">On this page ...</label>
     <ul class="md-nav__list" data-md-scrollfix>

         <li class="md-nav__item">
   <a href="#features-and-changes" class="md-nav__link">
     Features and changes
   </a>

     <nav class="md-nav">
       <ul class="md-nav__list">

           <li class="md-nav__item">
   <a href="#binaries-and-supported-environments" class="md-nav__link">
     Binaries and supported environments
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#some-class-data-sharing-is-enabled-by-default" class="md-nav__link">
     Some class data sharing is enabled by default
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#automatic-setting-of-initial-heap-size-is-enabled-by-default" class="md-nav__link">
     Automatic setting of initial heap size is enabled by default
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#option-to-share-vm-anonymous-classes" class="md-nav__link">
     Option to share VM anonymous classes
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#performance-improvements-for-jvmti-watched-fields-on-power-systems" class="md-nav__link">
     Performance improvements for JVMTI watched fields on Power Systems
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#linux-on-x86-support-for-transparent-huge-pages-thp" class="md-nav__link">
     Linux&reg; on x86: Support for Transparent Huge Pages (THP)
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#new-jcmd-tool" class="md-nav__link">
     New jcmd tool
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#changes-to-the-shared-classes-cache-generation-number" class="md-nav__link">
     Changes to the shared classes cache generation number
   </a>

 </li>

           <li class="md-nav__item">
   <a href="#the-xverifynone-and-noverify-options-are-deprecated" class="md-nav__link">
     The -Xverify:none and -noverify options are deprecated
   </a>

 </li>

       </ul>
     </nav>

 </li>

         <li class="md-nav__item">
   <a href="#full-release-information" class="md-nav__link">
     Full release information
   </a>

 </li>


     </ul>

 </nav>
                   </div>
                 </div>
               </div>


           <div class="md-content">
             <article class="md-content__inner md-typeset">

 <!-- this adds 'pencil' icon to H1 so that you can edit the page directly in GitHub

                   <a href="https://github.com/eclipse/openj9/edit/master/docs/version0.16.md" title="Edit this page" class="md-icon md-content__icon">&#xE3C9;</a>

 -->

                 <!--
 * Copyright (c) 2017, 2021 IBM Corp. and others
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/legal/epl-2.0/ or the Apache
 * License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the
 * following Secondary Licenses when the conditions for such
 * availability set forth in the Eclipse Public License, v. 2.0
 * are satisfied: GNU General Public License, version 2 with
 * the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH
 * Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 -->

 <h1 id="whats-new-in-version-0160">What's new in version 0.16.0</h1>
 <p>The following new features and notable changes since v 0.15.1 are included in this release:</p>
 <ul>
 <li><a href="#binaries-and-supported-environments">New binaries and changes to supported environments</a></li>
 <li><a href="#some-class-data-sharing-is-enabled-by-default">Some class data sharing is enabled by default</a></li>
 <li><a href="#automatic-setting-of-initial-heap-size-is-enabled-by-default">Automatic setting of initial heap size is enabled by default</a></li>
 <li><a href="#option-to-share-vm-anonymous-classes">Option to share VM anonymous classes</a></li>
 <li><a href="#performance-improvements-for-jvmti-watched-fields-on-power-systems">Performance improvements for JVMTI watched fields on Power Systems</a></li>
 <li><a href="#linux-on-x86-support-for-transparent-huge-pages-thp">Linux on x86: Support for Transparent Huge Pages (THP)</a></li>
 <li><a href="#new-jcmd-tool">New Java&trade; diagnostic command (<code>jcmd</code>) tool</a></li>
 <li><a href="#changes-to-the-shared-classes-cache-generation-number">Changes to the shared classes cache generation number</a></li>
 <li><a href="#the-xverifynone-and-noverify-options-are-deprecated"><img alt="Start of content that applies to Java 13 and later" src="../cr/java13plus.png" /> The <code>-Xverify:none</code> and <code>-noverify</code> options are deprecated</a></li>
 </ul>
 <h2 id="features-and-changes">Features and changes</h2>
 <h3 id="binaries-and-supported-environments">Binaries and supported environments</h3>
 <p>OpenJ9 release 0.16.0 supports OpenJDK 13, which is available from the AdoptOpenJDK community at the following link:</p>
 <ul>
 <li><a href="https://adoptopenjdk.net/archive.html?variant=openjdk13&amp;jvmVariant=openj9">OpenJDK version 13</a></li>
 </ul>
 <p>OpenJDK 13 with Eclipse OpenJ9 is not a long term support (LTS) release.</p>
 <p>The latest builds of OpenJDK with OpenJ9 for Java 8 and 11 at the AdoptOpenJDK community are for Eclipse OpenJ9 release 0.15.2. Features mentioned in these release notes are not available in these builds. Although it might be possible to build an OpenJDK 8 or OpenJDK 11 with OpenJ9 0.16.0, testing at the project is not complete and therefore support for any of these features is not available.</p>
 <p>To learn more about support for OpenJ9 releases, including OpenJDK levels and platform support, see <a href="../openj9_support/">Supported environments</a>.</p>
 <h3 id="some-class-data-sharing-is-enabled-by-default">Some class data sharing is enabled by default</h3>
 <p>Class data sharing is enabled by default for bootstrap classes, unless your application is running in a container. You can use the <code>-Xshareclasses</code> option to change the default behavior, including using <code>-Xshareclasses:none</code> to disable all class data sharing. For more information, see <a href="../shrc/">Class data sharing</a>.</p>
 <h3 id="automatic-setting-of-initial-heap-size-is-enabled-by-default">Automatic setting of initial heap size is enabled by default</h3>
 <p>OpenJ9 version 0.15.1 introduced the <a href="../xxusegcstartuphints/"><code>-XX:[+|-]UseGCStartupHints</code></a> option, which, when enabled, turned on the automatic learning and setting of an appropriate heap size for an application. This option is now enabled by default.</p>
 <h3 id="option-to-share-vm-anonymous-classes">Option to share VM anonymous classes</h3>
 <p>Prior to version 0.16.0, anonymous classes, those created by <code>Unsafe.defineAnonymousClass</code>, were not stored in the shared classes cache. They are now stored there by default, which means they are available for ahead-of-time (AOT) compilation, potentially improving startup performance. A new command, <a href="../xxshareanonymousclasses/">-XX:[+|-]ShareAnonymousClasses</a>, is introduced that enables you to stop anonymous classes being stored in the shared classes cache.</p>
 <h3 id="performance-improvements-for-jvmti-watched-fields-on-power-systems">Performance improvements for JVMTI watched fields on Power Systems</h3>
 <p>OpenJ9 version 0.14.0 introduced the <a href="../xxjitinlinewatches/"><code>-XX:[+|-]JITInlineWatches</code></a> option, which turns on JIT operations to improve the performance of JVMTI watched fields. This option, which was enabled by default in version 0.15.1, is now also supported on AIX&reg; and Linux on Power Systems&trade;.</p>
 <h3 id="linux-on-x86-support-for-transparent-huge-pages-thp">Linux&reg; on x86: Support for Transparent Huge Pages (THP)</h3>
 <p>When you use the <code>madvise</code> (<code>/sys/kernel/mm/transparent_hugepage/enabled</code>) setting on Linux on x86 systems, THP is now enabled by default. To disable this feature, set <a href="../xxtransparenthugepage/"><code>-XX:-TransparentHugePage</code></a> on the command line when you start your application. The THP setting on other systems remains disabled by default when you use <code>madvise</code>, but can be enabled by setting <a href="../xxtransparenthugepage/"><code>-XX:+TransparentHugePage</code></a>.</p>
 <h3 id="new-jcmd-tool">New jcmd tool</h3>
 <p>For compatibility with the reference implementation, OpenJ9 now includes an independent implementation of the <code>jcmd</code> tool  for running diagnostic commands on a VM. For more information, see <a href="../tool_jcmd/">Java diagnostic command tool</a>.</p>
 <h3 id="changes-to-the-shared-classes-cache-generation-number">Changes to the shared classes cache generation number</h3>
 <p>The format of classes that are stored in the shared classes cache is changed, which causes the JVM to create a new shared classes cache rather than re-creating or reusing an existing cache. To save space, you can remove all existing shared caches unless they are in use by an earlier release. As a result of the format change, a <code>layer</code> column now appears in the output of the <code>-Xshareclasses:listAllCaches</code> option. This change is to support a future enhancement.</p>
 <p>For more information about the <code>-Xshareclasses</code> option, including the <code>destroy</code> options that you can use to remove caches, see <a href="../xshareclasses/"><code>-Xshareclasses</code></a>.</p>
 <h3 id="the-xverifynone-and-noverify-options-are-deprecated"><img alt="Start of content that applies to Java 13 and later" src="../cr/java13plus.png" /> The <code>-Xverify:none</code> and <code>-noverify</code> options are deprecated</h3>
 <p>The option <a href="../xverify/"><code>-Xverify:none</code></a> (and its equivalent <code>-noverify</code>) is deprecated in Java 13. Both options might be removed in a future release. OpenJ9 issues a warning if these options are used in Java 13 and later versions. <img alt="End of content that applies only to Java 13" src="../cr/java_close.png" /></p>
 <h2 id="full-release-information">Full release information</h2>
 <p>To see a complete list of changes between Eclipse OpenJ9 v 0.15.1 and v 0.16.0 releases, see the <a href="https://github.com/eclipse/openj9/blob/master/doc/release-notes/0.16/0.16.md">Release notes</a>.</p>
 <!-- ==== END OF TOPIC ==== version0.15.md ==== -->


 <!--


 -->
               <!-- This block was originally in the theme's 'footer.html' partial file. It has been moved here in part to resolve issues with the footer being too large. -->
             </article>
           </div>
         </div>
       </main>

         <!--
 * Copyright (c) 2017, 2021 IBM Corp. and others
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/legal/epl-2.0/ or the Apache
 * License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the
 * following Secondary Licenses when the conditions for such
 * availability set forth in the Eclipse Public License, v. 2.0
 * are satisfied: GNU General Public License, version 2 with
 * the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH
 * Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 -->
 <cite></cite>
 <footer class="footer">
   <div class="md-footer-meta">


     <div class="above-line">
       <div class="above-line-links">
         <div class="column">
           <h3 >Docs</h3>
           <span class="footer-link"><a href="../openj9_newuser/" >New to OpenJ9?</a></span>
           <span class="footer-link"><a href="../introduction/">Getting started</a></span>
           <span class="footer-link"><a href="../cmdline_specifying/">Command-line options</a></span>
         </div>

         <div class="column">
           <h3>Resources</h3>
           <span class="footer-link"><a href="https://www.eclipse.org/openj9/about/" rel="noopener noreferrer" target="_blank">About</a></span>
           <span class="footer-link"><a href="https://www.eclipse.org/openj9/performance/" rel="noopener noreferrer" target="_blank">Performance</a></span>
         </div>

         <div class="column">
           <h3 >Community</h3>
           <span class="footer-link"><a href="https://www.eclipse.org/openj9/news/" rel="noopener noreferrer" target="_blank">News</a></span>
           <span class="footer-link"><a href="https://blog.openj9.org/" rel="noopener noreferrer" target="_blank">Blogs</a></span>
         </div>
       </div>

       <div class="column-incubator">
         <div class="arrange-column">
           <h3 ><b>OpenJ9 is an Eclipse Incubator project</b></h3>
           <a class="incubator-image" href="http://wiki.eclipse.org/Development_Resources/Process_Guidelines/What_is_Incubation" target="_blank"><img width="50px" src="../cr/incubator-logo.svg" alt="Eclipse Incubation"></a>
         </div>
       </div>
     </div>

     <div class="horizontal-line"></div>

     <div class="below-line">
       <span class="below-line-links"><a href="https://www.eclipse.org/" rel="noopener noreferrer" target="_blank">Eclipse Foundation Website </a></span>
       <span class="below-line-links"><a href="https://www.eclipse.org/legal/privacy.php" rel="noopener noreferrer" target="_blank">Privacy Policy</a></span>
       <span class="below-line-links"><a href="https://www.eclipse.org/legal/termsofuse.php" rel="noopener noreferrer" target="_blank">Terms of Use</a></span>
       <span class="below-line-links"><a href="https://www.eclipse.org/legal/copyright.php" rel="noopener noreferrer" target="_blank">Copyright Agent</a></span>
       <span class="below-line-links"><a href="https://www.eclipse.org/legal/" rel="noopener noreferrer" target="_blank">Legal</a></span>
       <div class="below-line-social-media-icons">
         <span class="social-media-link"> <a href="https://twitter.com/openj9/" rel="noopener noreferrer" target="_blank"> <img src="../cr/twitter-logo.svg" alt="Twitter Logo"></img></a></span>
         <span class="social-media-link"> <a href="https://github.com/eclipse/openj9" rel="noopener noreferrer" target="_blank"> <img src="../cr/github-logo.svg" alt="GitHub Logo"></img></a></span>
         <span class="social-media-link"> <a href="https://openj9.slack.com/" rel="noopener noreferrer" target="_blank"><img src="../cr/slack-icon.svg" alt="Slack logo"></img></a></span>
         <span class="social-media-link"> <a href="https://stackoverflow.com/search?q=%23OpenJ9" rel="noopener noreferrer" target="_blank"><img src="../cr/stackoverflow-logo.svg" alt="Stack Overflow logo"></img></a></span>
       </div>
     </div>
   </div>
 </footer>

     </div>

       <script src="../assets/javascripts/application.a8b5e56f.js"></script>


       <script>app.initialize({version:"1.0.4",url:{base:".."}})</script>

         <script src="../javascripts/oj9.js"></script>


 <script>
   window.ga = window.ga || function() {
     (ga.q = ga.q || []).push(arguments)
   }
   ga.l = +new Date
   /* Setup integration and send page view */
   ga("create", "UA-105616558-3", "mkdocs.org")
   ga("set", "anonymizeIp", true)
   ga("send", "pageview")
   /* Register handler to log search on blur */
   document.addEventListener("DOMContentLoaded", () => {
     if (document.forms.search) {
       var query = document.forms.search.query
       query.addEventListener("blur", function() {
         if (this.value) {
           var path = document.location.pathname;
           ga("send", "pageview", path + "?q=" + this.value)
         }
       })
     }
   })
 </script>
 <script async src="https://www.google-analytics.com/analytics.js"></script>


   </body>
 </html>