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<?xml version="1.0" encoding="UTF-8"?>
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<!-- $Header: /home/cvsroot/gentoo/xml/htdocs/doc/en/java.xml,v 1.10 2003/11/16 15:35:59 swift Exp $ -->
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swift |
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<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
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zhen |
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neysx |
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<guide link="/doc/en/java.xml">
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<title>Gentoo Java Guide</title>
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<author title="Author and Editor">
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<mail link="karltk@gentoo.org">Karl Trygve Kalleberg</mail>
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</author>
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<author title="Editor">
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<mail link="swift@gentoo.org">Sven Vermeulen</mail>
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</author>
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<abstract>
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Users' and Developers' Guide to Java in Gentoo
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</abstract>
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<license/>
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<version>0.1.3</version>
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<date>November 16, 2003</date>
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<chapter>
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<title>Installing a JDK/JRE</title>
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<section>
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<title>Overview</title>
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<body>
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<p>
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Gentoo provides numerous JDKs and JREs. The default is the Blackdown JDK/JRE
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pair, as it is freely (beer) available without any registration fuss.
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</p>
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<note>
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As kaffe becomes a JRE/JDK drop-in replacement, that will most likely become our
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default.
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</note>
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<p>
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Both the Sun JDK/JRE and the IBM JDK/JRE are generally faster, but getting them
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is a bit more work, as you are required to read and accept their license before
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downloading (IBM additionally requires you to register).
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</p>
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<p>
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Our ebuilds for the Sun and IBM JDK/JREs will notify you of where to go to
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download them.
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</p>
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</body>
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</section>
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<section>
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<title>Installing the Sun/IBM JDK/JREs</title>
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<body>
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<p>
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If you run <c>emerge sun-jdk-1.3.1</c> or <c>emerge ibm-jdk-1.3.1</c>, you will
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be notified that you are required to download the actual tarballs yourself. This
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has to do with license restrictions for the Sun JDK/JRE (online click-wrap
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license) and registration issues with the IBM JDK/JRE.
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</p>
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<note>
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There is also a sun-jdk-1.4.0, but not all packages work nicely with Java 1.4,
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so you're on your own if you use the 1.4.0 JDK.
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</note>
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<p>
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You should download the indicated file(s) into
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<path>/usr/portage/distfiles</path>. Once that is done, you can rerun the emerge
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command, then the JDK/JRE will be installed properly into <path>/opt</path>.
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</p>
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</body>
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</section>
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</chapter>
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<chapter>
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<title>Configuring your JDK/JRE</title>
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<section>
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<title>Overview</title>
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<body>
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<p>
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Gentoo has the ability to have multiple JDKs and JREs installed without them
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conflicting.
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</p>
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<p>
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Using the <c>java-config</c> tool, you can set the system-wide default if you
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have root access. Users can also use <c>java-config</c> to set up their own
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personal default, that is different from the system-wide default.
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</p>
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</body>
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</section>
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<section>
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<title>Setting a default JDK/JRE</title>
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<body>
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<p>
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Running the command <c>java-config --list-available-vms</c> will give you a list
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of all availble JREs and JDKs on your system, thus:
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</p>
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<pre caption="Listing available VMs">
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drobbins |
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[%1 ~] java-config --list-available-vms
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[blackdown-jdk-1.3.1] Blackdown JDK 1.3.1 (/etc/env.d/java/20blackdown-jdk-1.3.1)
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[blackdown-jre-1.3.1] Blackdown JRE 1.3.1 (/etc/env.d/java/20blackdown-jre-1.3.1)
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[ibm-jdk-1.3.0] IBM JDK 1.3.0 (/etc/env.d/java/20ibm-jdk-1.3.0)
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[ibm-jdk-1.3.1] IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1)
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[ibm-jre-1.3.1] IBM JRE 1.3.1 (/etc/env.d/java/20ibm-jre-1.3.1)
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[sun-jdk-1.4.0] Sun JDK 1.4.0 (/etc/env.d/java/20sun-jdk-1.4.0)
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neysx |
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</pre>
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<p>
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The name in the brackets <path>"[]"</path> is the handle or ID for that
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particular VM. You use pass that ID to <c>java-config --set-system-vm</c>, thus:
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</p>
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zhen |
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neysx |
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<pre caption="Setting the System VM">
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drobbins |
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[#1 ~] java-config --set-system-vm=ibm-jdk-1.3.1
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Now using IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1)
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</pre>
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drobbins |
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<note>
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You will have to be root to run --set-system-vm.
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</note>
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<p>
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Once you have issued <c>java-config --set-system-vm</c> with a particular VM ID,
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you will need to regenerate your /etc/profile.env, thus:
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</p>
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drobbins |
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<pre caption="Regenerating /etc/profile.env" >
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drobbins |
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[#1 ~] env-update
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</pre>
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<p>
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After this, you will either want to relogin, or resource
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<path>/etc/profile</path> into your environment.
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</p>
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<p>
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As a regular user, you can use <c>java-config --set-user-vm</c>, which will
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create <path>$HOME/.gentoo/java-env</path> with all required env vars. You would
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normally source this from your shell's startup script
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(<path>$HOME/.zshenv</path> in my case).
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</p>
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</body>
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</section>
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<section>
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<title>Setting a default CLASSPATH</title>
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<body>
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<p>
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<c>java-config</c> can also be used to set a system-wide default CLASSPATH, and
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of course a user-specific default CLASSPATH.
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</p>
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<p>
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First you want to list available java libraries that might be interesting to put
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in your CLASSPATH, thus:
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</p>
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<pre caption="Listing classes">
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drobbins |
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[%1 ~] java-config --list-available-packages
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[ant] No description (/usr/share/ant/classpath.env)
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[java-gnome] No description (/usr/share/java-gnome/classpath.env)
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[java-gtk] No description (/usr/share/java-gtk/classpath.env)
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[log4j] "" (/usr/share/log4j/package.env)
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</pre>
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<note>
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None of these packages have a proper description. That is something that will be
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implemented in the not-so-distant future.
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</note>
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<p>
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Again, the name in brackets <path>"[]"</path> are the IDs that you have to pass
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to <c>java-config --set-system-classpath</c>, thus:
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</p>
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drobbins |
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<pre caption="Setting classpaths">
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drobbins |
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java-config --set-system-classpath=log4j,java-gtk,java-gnome
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</pre>
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<note>
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The current directory (.) will not be part of the system classpath, as that
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should be added in root's login profile.
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</note>
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<p>
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Again, you will want to run <c>env-update</c> to update your system's
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environment, and you might also want to relogin or resource the
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<path>/etc/profile</path>.
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</p>
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<p>
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For users, <c>java-config --set-user-classpath</c> will create
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<path>$HOME/.gentoo/java-env-classpath</path>, which is automatically included
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by <path>$HOME/.gentoo/java-env</path>.
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</p>
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</body>
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</section>
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</chapter>
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<chapter>
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<title>Additional resources</title>
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<section>
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<title>Off-line resources</title>
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<body>
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<ul>
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<li>java-config man page</li>
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<li><c>java-config --help</c></li>
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<li>The <path>/usr/bin/java-config</path> script itself</li>
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</ul>
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</body>
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</section>
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<section>
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<title>Online resources</title>
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<body>
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<ul>
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<li>The <uri link="http://news.gmane.org/gmane.linux.gentoo.devel"
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>gentoo-dev</uri>, <uri link="http://news.gmane.org/gmane.linux.gentoo.user"
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>gentoo-user </uri> mailing list archives</li>
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<li>#gentoo on irc.openprojects.net</li>
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</ul>
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</body>
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</section>
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</chapter>
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</guide> |
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