mirror of
https://github.com/Zeckmathederg/glfs.git
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02e06ab1d6
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@21197 af4574ff-66df-0310-9fd7-8a98e5e911e0
161 lines
6.4 KiB
XML
161 lines
6.4 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!-- Maintainer: before making the tarball, remove all .debuginfo files from
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the directory: this saves more than 70 MB. -->
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<!ENTITY anduin-download "&sources-anduin-http;/OpenJDK/OpenJDK-&openjdk-version;">
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<!ENTITY openjdk-download-binary-x86 "&anduin-download;/OpenJDK-&openjdk-version;+&openjdk-build;-i686-bin.tar.xz">
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<!ENTITY openjdk-bin-md5sum-x86 "2b917647040e9804e0f3ccd51f40394b">
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<!ENTITY openjdk-bin-size-x86 "158 MB">
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<!ENTITY openjdk-bin-buildsize-x86 "273 MB">
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<!-- Not uploaded to anduin, since this file is now available under GNU GPLv2
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licence.-->
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<!-- I've crafted a binary in case the version is removed from Oracle after
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BLFS 8.4 is released. -->
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<!ENTITY openjdk-download-binary-x64 "https://download.java.net/java/GA/jdk11/&openjdk-build;/GPL/openjdk-&openjdk-version;_linux-x64_bin.tar.gz">
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<!ENTITY openjdk-bin-md5sum-x64 "ce52c5844200c569a50a869e579d88f6">
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<!ENTITY openjdk-bin-size-x64 "179 MB">
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<!ENTITY openjdk-bin-buildsize-x64 "296 MB">
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]>
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<sect1 id="java" xreflabel="Java-&openjdk-version;">
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<?dbhtml filename="java.html"?>
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<sect1info>
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<othername>$LastChangedBy$</othername>
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<date>$Date$</date>
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</sect1info>
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<title>Java-&openjdk-version;</title>
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<indexterm zone="java">
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<primary sortas="a-java">JDK Binary</primary>
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</indexterm>
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<sect2>
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<title>About Java</title>
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<para>Java is different from most of the packages in LFS and BLFS. It
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is a programming language that works with files of byte codes to obtain
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instructions and executes then in a Java Virtual Machine (JVM). An
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introductory java program looks like:</para>
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<screen><literal>public class HelloWorld
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{
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public static void main(String[] args)
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{
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System.out.println("Hello, World");
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}
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}</literal></screen>
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<para>This program is saved as <filename>HelloWorld.java</filename>. The
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file name, <emphasis>HelloWorld</emphasis>, must match the class name. It
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is then converted into byte code with
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<command>javac HelloWorld.java</command>. The output file is
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<filename>HelloWorld.class</filename>. The program is executed with
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<command>java HelloWorld</command>. This creates a JVM and runs the
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code. The 'class' extension must not be specified.</para>
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<para>Several class files can be combined into one file with the
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<command>jar</command> command. This is similar to the standard
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<command>tar</command> command. For instance, the command
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<command>jar cf myjar.jar *.class</command> will combine all class files
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in a directory into one jar file. These act as library files.</para>
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<para>The JVM can search for and use classes in jar files automatically.
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It uses the <envar>CLASSPATH</envar> environment variable to search for
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jar files. This is a standard list of colon-separated directory names
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similar to the <envar>PATH</envar> environment variable.</para>
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</sect2>
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<sect2 id="java-bin" xreflabel="Java Binary" role="package">
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<title>Binary JDK Information</title>
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<para>Creating a JVM from source requires a set of circular dependencies.
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The first thing that's needed is a set of programs called a Java Development
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Kit (JDK). This set of programs includes <command>java</command>,
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<command>javac</command>, <command>jar</command>, and several others. It
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also includes several base <emphasis>jar</emphasis> files.</para>
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<para>To start, we set up a binary installation of the JDK created
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by the BLFS editors. It is installed in the <filename>/opt</filename>
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directory to allow for multiple installations, including a source based
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version.</para>
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&lfs84_checked;
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<bridgehead renderas="sect3">Binary Package Information</bridgehead>
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<itemizedlist spacing="compact">
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<listitem>
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<para>Binary download (x86):
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<ulink url="&openjdk-download-binary-x86;"/></para>
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</listitem>
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<listitem>
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<para>Download MD5 sum: &openjdk-bin-md5sum-x86;</para>
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</listitem>
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<listitem>
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<para>Download size (binary): &openjdk-bin-size-x86;</para>
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</listitem>
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<listitem>
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<para>Estimated disk space required: &openjdk-bin-buildsize-x86;</para>
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</listitem>
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</itemizedlist>
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<itemizedlist spacing="compact">
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<listitem>
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<para>Binary download (x86_64):
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<ulink url="&openjdk-download-binary-x64;"/></para>
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</listitem>
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<listitem>
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<para>Download MD5 sum: &openjdk-bin-md5sum-x64;</para>
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</listitem>
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<listitem>
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<para>Download size (binary): &openjdk-bin-size-x64;</para>
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</listitem>
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<listitem>
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<para>Estimated disk space required: &openjdk-bin-buildsize-x64;</para>
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</listitem>
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</itemizedlist>
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<bridgehead renderas="sect3">Java Binary Runtime Dependencies</bridgehead>
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<para role="required">
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<xref role="runtime" linkend="alsa-lib"/>,
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<xref role="runtime" linkend="cups"/>,
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<xref role="runtime" linkend="giflib"/>, and
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<xref role="runtime" linkend="xorg7-lib"/>
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</para>
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</sect2>
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<sect2 role="installation">
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<title>Installation of the Java BinaryJDK </title>
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<para>Begin by extracting the appropriate binary tarball for your
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architecture and changing to the extracted directory. Install the binary
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<application>OpenJDK</application> with the following commands as the
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<systemitem class="username">root</systemitem> user:</para>
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<screen role="root"><userinput>install -vdm755 /opt/OpenJDK-&openjdk-version;+&openjdk-build;-bin &&
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mv -v * /opt/OpenJDK-&openjdk-version;+&openjdk-build;-bin &&
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chown -R root:root /opt/OpenJDK-&openjdk-version;+&openjdk-build;-bin</userinput></screen>
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<para>
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The binary version is now installed. You may create a symlink to that
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version by issuing, as the <systemitem class="username">root</systemitem>
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user:
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</para>
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<screen role="root"><userinput>ln -sfn OpenJDK-&openjdk-version;+&openjdk-build;-bin /opt/jdk</userinput></screen>
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<para>
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You may now proceed to <xref linkend="ojdk-conf"/>, where the
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instructions assume that the above link exists.
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</para>
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</sect2>
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</sect1>
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