source: general/prog/openjdk.xml@ 5cdaaee

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY ojdk-tarball              "jdk-&openjdk-version;-ga.tar.gz">
  <!ENTITY ojdk-repo                 "https://github.com/openjdk/jdk22u">
  <!ENTITY ojdk-download             "&ojdk-repo;/archive/&ojdk-tarball;">

  <!ENTITY anduin-download           "&sources-anduin-http;/OpenJDK/OpenJDK-&openjdk-version;">

  <!ENTITY ojdk-md5sum               "928f3f94c7d2e0c021e11557c5854398">
  <!ENTITY ojdk-size                 "107 MB">

  <!ENTITY jtreg-version             "7.3.1+1">
  <!ENTITY jtreg-download            "&anduin-download;/jtreg-&jtreg-version;.tar.gz">
  <!ENTITY jtreg-md5sum              "0038551ecaf37d0cd99832217f79e56d">
  <!ENTITY jtreg-size                "9.0 MB">

  <!ENTITY ojdk-bdsize               "3.7 GB (add 621 MB for tests)">
  <!ENTITY ojdk-time                 "5.2 SBU with 4 jobs (add 38 SBU for tests with 4 jobs)">
]>

<sect1 id="openjdk" xreflabel="OpenJDK-&openjdk-version;">
  <?dbhtml filename="openjdk.html" ?>


  <title>OpenJDK-&openjdk-version;</title>

  <indexterm zone="openjdk">
    <primary sortas="a-OpenJDK">OpenJDK</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to OpenJDK</title>

    <para>
      <application>OpenJDK</application> is an open-source implementation
      of Oracle's Java Standard Edition platform.
      <application>OpenJDK</application> is useful for developing
      <application>Java</application> programs, and provides a complete
      runtime environment to run <application>Java</application> programs.
    </para>

    &lfs121_checked;

    <para>
      OpenJDK is GPL'd code, with a special exception made for non-free
      projects to use these classes in their proprietary products.
      In similar fashion to the LGPL, which allows non-free programs to link
      to libraries provided by free software, the
      <ulink url="https://openjdk.org/legal/gplv2+ce.html">GNU
      General Public License, version 2, with the Classpath Exception</ulink>
      allows third party programs to use classes provided by free software
      without the requirement that the third party software also be free. As
      with the LGPL, any modifications made to the free software portions of a
      third party application, must also be made freely available.
    </para>

    <note>
      <para>
        The <application>OpenJDK</application> source includes a very
        thorough, open source test suite using the
        <application>JTreg</application> test harness. The testing instructions
        below allow testing the just built JDK for reasonable compatibility
        with the proprietary Oracle JDK. However, in order for an independent
        implementation to claim compatibility, it must pass a proprietary
        <application>JCK/TCK</application> test suite. No claims of
        compatibility, or even partial compatibility, may be made without passing
        an approved test suite.
      </para>

      <para>
        Oracle does provide free community access, on a case-by-case basis, to
        a closed toolkit to ensure 100% compatibility with its proprietary JDK.
        Neither the binary version provided on the <xref linkend="java"/> page
        nor the JVM built with the instructions below have been tested against
        the <ulink
  url="https://openjdk.java.net/groups/conformance/JckAccess/jck-access.html">
        TCK</ulink>. Any version that is built using the instructions given,
        cannot claim to be compatible with the proprietary JDK, without the
        user applying for, and completing the compatibility tests themselves.
      </para>

      <para>
        With that in mind, the binaries produced using this build method are
        regularly tested against the TCK by the members listed on the site
        above. In addition to the community license above, an educational,
        non-commercial license for the TCK can be obtained <ulink
        url="https://www.oracle.com/java/scholarship-program.html">
        here</ulink>.
      </para>
    </note>

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&ojdk-download;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url=" "/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &ojdk-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download Size: &ojdk-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &ojdk-bdsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &ojdk-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>

    <para>
      <emphasis role="strong">Optional test harness</emphasis>
    </para>

    <itemizedlist spacing='compact'>
      <listitem>
        <para>
          <ulink url="&jtreg-download;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &jtreg-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download Size: &jtreg-size;
        </para>
      </listitem>
    </itemizedlist>
<!--
    <bridgehead renderas="sect4">Required patch</bridgehead>

    <itemizedlist spacing='compact'>
      <listitem>
        <para>
          <ulink url="&patch-root;/openjdk-&openjdk-version;-make_4.3_fix-1.patch"/>
        </para>
      </listitem>
    </itemizedlist>
-->
    <bridgehead renderas="sect3">OpenJDK Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required Dependencies</bridgehead>
    <para role="required">
      An existing binary (<xref linkend="java"/> or an earlier built
      version of this package. The instructions below assume that
      you are using <xref linkend="ojdk-conf"/>),
      <xref linkend="alsa-lib"/>,
      <xref linkend="cpio"/>,
      <xref linkend="cups"/>,
      <xref linkend="unzip"/>,
      <xref linkend="which"/>,
      <xref linkend="xorg7-lib"/>, and
      <xref linkend="zip"/>
    </para>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended">
      <xref linkend="make-ca"/>,
      <xref linkend="giflib"/>,
      <xref linkend="harfbuzz"/>,
      <xref linkend="lcms2"/>,
      <xref linkend="libjpeg"/>,
      <xref linkend="libpng"/>, and
      <xref linkend="wget"/>
    </para>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="git"/>,
      <xref linkend="graphviz"/>,
      <xref linkend="mercurial"/>,
<!-- not needed now, it seems
      an X Window manager such as <xref linkend="twm"/> (for the tests), and
-->
      <ulink url="https://ccache.dev/">ccache</ulink>,
      <ulink url="https://pandoc.org/">pandoc</ulink>, and
      <ulink url="https://zlib.net/pigz">pigz</ulink>
    </para>


  </sect2>

  <sect2 role="installation">
    <title>Installation of OpenJDK</title>

    <para>
      If you have downloaded the optional test harness, unpack it now:
    </para>

<screen><userinput>tar -xf ../jtreg-&jtreg-version;.tar.gz</userinput></screen>
<!--
    <para>
      Apply a patch to allow building with make-4.3:
    </para>

<screen><userinput>patch -p1 -i ../openjdk-&openjdk-version;-make_4.3_fix-1.patch</userinput></screen>

    <para>
      Fix an issue coming from a removed header in glibc-2.32:
    </para>

<screen><userinput>sed -i /sysctl/d \
    src/jdk.incubator.jpackage/unix/native/libapplauncher/PosixPlatform.cpp</userinput></screen>
-->
    <note>
      <para>
        Before proceeding, you should ensure that your environment
        <envar>PATH</envar> variable contains the location of the Java
        compiler used for bootstrapping <application>OpenJDK</application>.
        This is the only requirement for the environment. Modern Java
        installations do not need <envar>JAVA_HOME</envar> and
        <envar>CLASSPATH</envar> is not used here. Furthermore, OpenJDK
        developers recommend unsetting <envar>JAVA_HOME</envar>.
      </para>

      <para>
        The build system does not allow the <option>-j</option> switch in
        <envar>MAKEFLAGS</envar>. See the command explanation for
        <option>--with-jobs=</option>
        for more information on customizing parallelization.
      </para>
    </note>

    <para>
      Configure and build the package with the following commands:
    </para>

<screen><userinput>unset JAVA_HOME                             &amp;&amp;
bash configure --enable-unlimited-crypto    \
               --disable-warnings-as-errors \
               --with-stdc++lib=dynamic     \
               --with-giflib=system         \
               --with-harfbuzz=system       \
               --with-jtreg=$PWD/jtreg      \
               --with-lcms=system           \
               --with-libjpeg=system        \
               --with-libpng=system         \
               --with-zlib=system           \
               --with-version-build="&openjdk-build;"    \
               --with-version-pre=""        \
               --with-version-opt=""        \
               --with-cacerts-file=/etc/pki/tls/java/cacerts &amp;&amp;
make images</userinput></screen>

    <para>
      To test the results, you will need to execute the jtreg program.
      You can set the number of concurrent tests by adding the
      <parameter>-conc:<replaceable>&lt;X&gt;</replaceable></parameter>
      value in the below command (tests will run sequentially otherwise):
    </para>

<screen remap="test"><userinput>export JT_JAVA=$(echo $PWD/build/*/jdk) &amp;&amp;
jtreg/bin/jtreg -jdk:$JT_JAVA -automatic -ignore:quiet -v1 \
    test/jdk:tier1 test/langtools:tier1 &amp;&amp;
unset JT_JAVA</userinput></screen>

    <para>
      For more control over the test suite, review the documentation
      available in <filename>jtreg/doc/jtreg/usage.txt</filename>. To review
      the results, see the files
      <filename>JTreport/test_{jdk,langtools}/text/stats.txt</filename> and
      <filename>JTreport/test_{jdk,langtools}/text/summary.txt</filename>.
      You should expect to see around 60 failures and 10 errors.
    </para>
    <!--
         14.0.1+7:
         for x86_64: passed: 5,836; failed: 42; error: 50
         17.0.2+8:
         for x86_64: passed: 6,238; failed: 48; error: 13
         for i686:   passed: 6,208; failed: 29; error: 6
         18.0.1+10:
         for x86_64: passed: 6,323; failed: 53; error: 14
         for i686:   passed: 6,290; failed: 29; error: 11
         18.0.1.1+2:
         for x86_64: passed: 6,323; failed: 53; error: 14
         for i686:   passed: 6,290; failed: 29; error: 11
         18.0.2+8:
         for x86_64: passed: 6,329; failed: 50; error: 14
         for i686:   passed: 6,289; failed: 31; error: 13
         19.0.1+10:
         for x86_64: passed: 6,423; failed: 58; error: 15
         for i686:   passed: 6,376; failed: 31; error: 12
         19.0.2+7:
         for x86_64: passed: 6,426; failed: 61; error: 14
         for i686:   passed: 6,377; failed: 34; error: 11
         20.0.1+9:
         for x86_64: passed: 6,515; failed: 65; error: 13
         for i686:   passed: 6,520; failed: 60; error: 13
         20.0.2+9:
         for x86_64: passed: 6,515; failed: 65; error: 14
         for i686:   passed: 6,446; failed: 33; error: 12
         21+35:
         for x86_64: passed: 6,699; failed: 72; error: 13
         for i686:   passed: 6,627; failed: 30; error: 10
         21.0.1+12:
         for x86_64: passed: 6,706; failed: 72; error: 14
         for i686:   passed: 6,636; failed: 29; error: 11
         21.0.2+13:
         for x86_64: passed: 6,698; failed: 71; error: 13
         for i686:   passed: 6,606; failed: 30; error: 34
         22.0.1+8:
         for x86_64: passed: 6,776; failed: 77; error: 14
         for i686:   passed: 6,703; failed: 76; error: 21
    -->

    <para>
      Install the package with the following commands as the
      <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>install -vdm755 /opt/jdk-&openjdk-version;+&openjdk-build;             &amp;&amp;
cp -Rv build/*/images/jdk/* /opt/jdk-&openjdk-version;+&openjdk-build; &amp;&amp;
chown -R root:root /opt/jdk-&openjdk-version;+&openjdk-build;          &amp;&amp;
for s in 16 24 32 48; do
  install -vDm644 src/java.desktop/unix/classes/sun/awt/X11/java-icon${s}.png \
                  /usr/share/icons/hicolor/${s}x${s}/apps/java.png
done</userinput></screen>

    <note>
      <para>
        If you only wish to install the Java Runtime Environment, you can
        substitute <filename>build/*/images/jre</filename> in the above
        <command>cp</command> command.
      </para>
    </note>

    <para>
      There are now two <application>OpenJDK</application> SDKs installed
      in <filename class="directory">/opt</filename>. You should decide on
      which one you would like to use as the default. Normally, you would opt
      for the just installed <application>OpenJDK</application>. If so, do
      the following as the <systemitem class="username">root</systemitem>
      user:
    </para>

<screen role="root"><userinput>ln -v -nsf jdk-&openjdk-version;+&openjdk-build; /opt/jdk</userinput></screen>

    <para>
      If desired, you can create .desktop files to add entries
      in the menu for <command>java</command>
      and <command>jconsole</command>. The needed icons have already been
      installed. As the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>mkdir -pv /usr/share/applications &amp;&amp;

cat &gt; /usr/share/applications/openjdk-java.desktop &lt;&lt; "EOF" &amp;&amp;
<literal>[Desktop Entry]
Name=OpenJDK Java &openjdk-version; Runtime
Comment=OpenJDK Java &openjdk-version; Runtime
Exec=/opt/jdk/bin/java -jar
Terminal=false
Type=Application
Icon=java
MimeType=application/x-java-archive;application/java-archive;application/x-jar;
NoDisplay=true</literal>
EOF
cat &gt; /usr/share/applications/openjdk-jconsole.desktop &lt;&lt; "EOF"
<literal>[Desktop Entry]
Name=OpenJDK Java &openjdk-version; Console
Comment=OpenJDK Java &openjdk-version; Console
Keywords=java;console;monitoring
Exec=/opt/jdk/bin/jconsole
Terminal=false
Type=Application
Icon=java
Categories=Application;System;</literal>
EOF</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <command>bash configure...</command>: the top level
      <filename>configure</filename> is a wrapper around the autotools one.
      It is not executable and must be run through <command>bash</command>.
    </para>
<!-- Not needed in openjdk-15
    <para>
      <parameter>- -with-extra-cflags=-fcommon</parameter>: Allows building
      with GCC 10.
    </para>
-->
    <para>
      <parameter>--enable-unlimited-crypto</parameter>: Because of limitations
      on the usage of cryptography in some countries, there is the possibility
      to limit the size of encryption keys and the use of some algorithms in a
      policy file. This switch allows to ship a policy file with no
      restriction. It is the responsibility of the user to ensure proper
      adherence to the law.
    </para>

    <para>
      <parameter>--disable-warnings-as-errors</parameter>: This switch disables
      use of <envar>-Werror</envar> in the build.
    </para>

    <para>
      <parameter>--with-stdc++lib=dynamic</parameter>: This switch forces the
      build system to link to <filename>libstdc++.so</filename> (dynamic)
      instead of <filename>libstdc++.a</filename> (static).
    </para>

    <para>
      <option>--with-jobs=<replaceable>&lt;X&gt;</replaceable></option>:
      The <parameter>-j</parameter> passed to make does not work with make as
      invoked here. By default, the build system will use the number of
      CPUs - 1.
    </para>

    <para>
      <parameter>--with-jtreg=$PWD/jtreg</parameter>: This switch tells
      configure where to find jtreg. Omit if you have not downloaded the
      optional test suite.
    </para>

    <para>
      <parameter>--with-{giflib,harfbuzz,lcms,libjpeg,libpng,zlib}=system</parameter>:
      These switches force the build system to use the system libraries instead
      of the bundled versions.
    </para>

    <para>
      <parameter>--with-version-build</parameter>: Currently, the build
      system does not include the build number in the version string. It has
      to be specified here.
    </para>

    <para>
      <parameter>--with-version-pre</parameter>: This switch allows you to
      prefix the version string with a custom string.
    </para>

    <para>
      <parameter>--with-version-opt</parameter>: This switch allows you to add
      an optional build description to the version string.
    </para>

    <para>
      <parameter>--with-cacerts-file=/etc/pki/tls/java/cacerts</parameter>:
      Specifies where to find a <filename>cacerts</filename> file,
      <filename>/etc/pki/tls/java/</filename> on a BLFS system. Otherwise, an
      empty one is created. You can use the
      <command>/usr/sbin/make-ca --force</command> command to generate it, once
      you have installed the Java binaries.
    </para>

    <para>
      <option>--with-boot-jdk</option>: This switch provides the
      location of the temporary <application>JDK</application>. It is normally
      not needed if <command>java</command> is found in the <envar>PATH</envar>.
    </para>
<!-- Seems to have disappeared
    <para>
      <command>find ... -iname '*.diz' -delete</command>: This command
      removes redundant files.
    </para>
-->
  </sect2>

  <sect2 role="configuration"
         id="openjdk-config"
         xreflabel="Configuring OpenJDK">
    <title>Configuring OpenJDK</title>

    <sect3>
      <title>Configuration Information</title>

      <para>
        Normally, the Java environment has been configured after installing
        the binary version, and can be used with the just built package as well.
        Review <xref linkend="ojdk-conf"/> in case you want to modify
        something.
      </para>

      <para>
        To test if the man pages are correctly installed, issue
        <command>source /etc/profile</command> and <command>man java</command>
        to display the respective man page.
      </para>

    </sect3>

    <sect3>
      <title>
        Setting up the JRE Certificate Authority Certificates (cacerts) file
      </title>

      <para>
        If you have run the instructions on the <xref linkend="make-ca"/> page,
        you only need to create a symlink in the default location for the
        <filename>cacerts</filename> file. As user <systemitem
        class="username">root</systemitem>:
      </para>

<screen role="root"><userinput>ln -sfv /etc/pki/tls/java/cacerts /opt/jdk/lib/security/cacerts</userinput></screen>

      <para>
        To check the installation, issue:
      </para>

<screen role="root"><userinput>cd /opt/jdk
bin/keytool -list -cacerts</userinput></screen>

    <para>
      At the prompt <computeroutput>Enter keystore password:</computeroutput>,
      enter <userinput>changeit</userinput> (the default) or just press the
      <quote>Enter</quote> key. If the <filename>cacerts</filename> file was
      installed correctly, you will see a list of the certificates with
      related information for each one. If not, you need to reinstall them.
    </para>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directory</segtitle>

      <seglistitem>
        <seg>jar, jarsigner, java, javac, javadoc, javap, jcmd,
        jconsole, jdb, jdeprscan, jdeps, jfr, jhsdb, jimage, jinfo,
        jlink, jmap, jmod, jpackage, jps, jrunscript, jshell, jstack,
        jstat, jstatd, jwebserver, keytool, rmiregistry, and serialver</seg>
        <seg>38 libraries in /opt/jdk-&openjdk-version;+&openjdk-build;/lib/</seg>
        <seg>/opt/jdk-&openjdk-version;+&openjdk-build;</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="jar">
        <term><command>jar</command></term>
        <listitem>
          <para>
            combines multiple files into a single jar archive
          </para>
          <indexterm zone="openjdk jar">
            <primary sortas="b-jar">jar</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jarsigner">
        <term><command>jarsigner</command></term>
        <listitem>
          <para>
            signs jar files and verifies the signatures and integrity
            of a signed jar file
          </para>
          <indexterm zone="openjdk jarsigner">
            <primary sortas="b-jarsigner">jarsigner</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="java-prog">
        <term><command>java</command></term>
        <listitem>
          <para>
            launches a Java application by starting a Java runtime
            environment, loading a specified class and invoking its main
            method
          </para>
          <indexterm zone="openjdk java-prog">
            <primary sortas="b-java-prog">java</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="javac">
        <term><command>javac</command></term>
        <listitem>
          <para>
            reads class and interface definitions, written in the
            Java programming language, and compiles them into bytecode
            class files
          </para>
          <indexterm zone="openjdk javac">
            <primary sortas="b-javac">javac</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="javadoc">
        <term><command>javadoc</command></term>
        <listitem>
          <para>
            parses the declarations and documentation comments in a
            set of Java source files and produces a corresponding set of
            HTML pages describing the classes, interfaces, constructors,
            methods, and fields
          </para>
          <indexterm zone="openjdk javadoc">
            <primary sortas="b-javadoc">javadoc</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="javap">
        <term><command>javap</command></term>
        <listitem>
          <para>
            disassembles a Java class file
          </para>
          <indexterm zone="openjdk javap">
            <primary sortas="b-javap">javap</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jcmd">
        <term><command>jcmd</command></term>
        <listitem>
          <para>
            is a utility to send diagnostic command requests to a running
            Java Virtual Machine
          </para>
          <indexterm zone="openjdk jcmd">
            <primary sortas="b-jcmd">jcmd</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jconsole">
        <term><command>jconsole</command></term>
        <listitem>
          <para>
            is a graphical console tool to monitor and manage both
            local and remote Java applications and virtual machines
          </para>
          <indexterm zone="openjdk jconsole">
            <primary sortas="b-jconsole">jconsole</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jdb">
        <term><command>jdb</command></term>
        <listitem>
          <para>
            is a simple command-line debugger for Java classes
          </para>
          <indexterm zone="openjdk jdb">
            <primary sortas="b-jdb">jdb</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jdeprscan">
        <term><command>jdeprscan</command></term>
        <listitem>
          <para>
            scans class or jar files for uses of deprecated API elements
          </para>
          <indexterm zone="openjdk jdeprscan">
            <primary sortas="b-jdeprscan">jdeprscan</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jdeps">
        <term><command>jdeps</command></term>
        <listitem>
          <para>
            shows the package-level or class-level dependencies of
            Java class files
          </para>
          <indexterm zone="openjdk jdeps">
            <primary sortas="b-jdeps">jdeps</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jfr">
        <term><command>jfr</command></term>
        <listitem>
          <para>
            is a tool for working with <quote>Flight Recorder</quote> files
          </para>
          <indexterm zone="openjdk jfr">
            <primary sortas="b-jfr">jfr</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jhsdb">
        <term><command>jhsdb</command></term>
        <listitem>
          <para>
            is a tool to analyze the content of a core dump from a
            crashed Java Virtual Machine (JVM)
          </para>
          <indexterm zone="openjdk jhsdb">
            <primary sortas="b-jhsdb">jhsdb</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jimage">
        <term><command>jimage</command></term>
        <listitem>
          <para>
            is used to list, extract, verify, or get information about
            modules in <emphasis>jimage</emphasis> format
          </para>
          <indexterm zone="openjdk jimage">
            <primary sortas="b-jimage">jimage</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jinfo">
        <term><command>jinfo</command></term>
        <listitem>
          <para>
            prints Java configuration information for a given Java
            process, core file, or a remote debug server
          </para>
          <indexterm zone="openjdk jinfo">
            <primary sortas="b-jinfo">jinfo</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jlink">
        <term><command>jlink</command></term>
        <listitem>
          <para>
            is used to assemble and optimize a set of modules and their
            dependencies into a custom runtime image
          </para>
          <indexterm zone="openjdk jlink">
            <primary sortas="b-jlink">jlink</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jmap">
        <term><command>jmap</command></term>
        <listitem>
          <para>
            prints shared object memory maps or heap memory details
            of a given process, core file, or a remote debug server
          </para>
          <indexterm zone="openjdk jmap">
            <primary sortas="b-jmap">jmap</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jmod">
        <term><command>jmod</command></term>
        <listitem>
          <para>
            creates JMOD files and lists the content of existing JMOD files
          </para>
          <indexterm zone="openjdk jmod">
            <primary sortas="b-jmod">jmod</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jpackage">
        <term><command>jpackage</command></term>
        <listitem>
          <para>
            generates java application packages and images
          </para>
          <indexterm zone="openjdk jpackage">
            <primary sortas="b-jpackage">jpackage</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jps">
        <term><command>jps</command></term>
        <listitem>
          <para>
            lists the instrumented JVMs on the target system
          </para>
          <indexterm zone="openjdk jps">
            <primary sortas="b-jps">jps</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jrunscript">
        <term><command>jrunscript</command></term>
        <listitem>
          <para>
            is a command line script shell
          </para>
          <indexterm zone="openjdk jrunscript">
            <primary sortas="b-jrunscript">jrunscript</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jshell">
        <term><command>jshell</command></term>
        <listitem>
          <para>
            is an interactive tool for learning the Java programming
            language and prototyping Java code
          </para>
          <indexterm zone="openjdk jshell">
            <primary sortas="b-jshell">jshell</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jstack">
        <term><command>jstack</command></term>
        <listitem>
          <para>
            prints Java stack traces of Java threads for a given
            Java process, core file, or a remote debug server
          </para>
          <indexterm zone="openjdk jstack">
            <primary sortas="b-jstack">jstack</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jstat">
        <term><command>jstat</command></term>
        <listitem>
          <para>
            displays performance statistics for an instrumented JVM
          </para>
          <indexterm zone="openjdk jstat">
            <primary sortas="b-jstat">jstat</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jstatd">
        <term><command>jstatd</command></term>
        <listitem>
          <para>
            is an RMI server application that monitors for the creation
            and termination of instrumented JVMs
          </para>
          <indexterm zone="openjdk jstatd">
            <primary sortas="b-jstatd">jstatd</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="jwebserver">
        <term><command>jwebserver</command></term>
        <listitem>
          <para>
            provides a minimal HTTP server, designed to be used for
            prototyping, testing, and debugging
          </para>
          <indexterm zone="openjdk jwebserver">
            <primary sortas="b-jwebserver">jwebserver</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="keytool">
        <term><command>keytool</command></term>
        <listitem>
          <para>
            is a key and certificate management utility
          </para>
          <indexterm zone="openjdk keytool">
            <primary sortas="b-keytool">keytool</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="rmiregistry">
        <term><command>rmiregistry</command></term>
        <listitem>
          <para>
            creates and starts a remote object registry on the specified
            port on the current host
          </para>
          <indexterm zone="openjdk rmiregistry">
            <primary sortas="b-rmiregistry">rmiregistry</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="serialver">
        <term><command>serialver</command></term>
        <listitem>
          <para>
            returns the serialVersionUID for one or more classes in a
            form suitable for copying into an evolving class
          </para>
          <indexterm zone="openjdk serialver">
            <primary sortas="b-serialver">serialver</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>

  </sect2>

</sect1>