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1<?xml version='1.0'?> 1<?xml version='1.0' encoding="UTF-8"?>
2<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?> 2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/java.xml,v 1.9 2003/11/15 00:35:19 neysx Exp $ -->
3<guide> 3<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
4
5<guide link = "/doc/en/java.xml">
4<title>Gentoo Java Guide</title> 6 <title>Gentoo Java Guide</title>
5<author title="Author and Editor"> 7 <author title="Author and Editor">
6<mail link="karltk@gentoo.org">Karl Trygve Kalleberg</mail> 8 <mail link="karltk@gentoo.org">Karl Trygve Kalleberg</mail>
7</author> 9 </author>
8 10
9<abstract> 11 <abstract>
10Users' and Developers' Guide to Java in Gentoo 12 Users' and Developers' Guide to Java in Gentoo
11</abstract> 13 </abstract>
12 14
15 <license/>
16
13<version>0.1.1</version> 17 <version>0.1.2</version>
14<date>June 25, 2002</date> 18 <date>September 4, 2002</date>
15 19
16<chapter> 20 <chapter>
17
18<title>Installing a JDK/JRE</title> 21 <title>Installing a JDK/JRE</title>
19<section> 22 <section>
20<title>Overview</title> 23 <title>Overview</title>
21<body> 24 <body>
25
22<p>Gentoo provides numerous JDKs and JREs. The default is the 26 <p>Gentoo provides numerous JDKs and JREs. The default is the
23Blackdown JDK/JRE pair, as it is freely (beer) available without any 27 Blackdown JDK/JRE pair, as it is freely (beer) available without any
24registration fuss.</p> 28 registration fuss.
29 </p>
25 30
26<note>As kaffe becomes a JRE/JDK drop-in replacement, that will most 31 <note>As kaffe becomes a JRE/JDK drop-in replacement, that will most
27likely become our default.</note> 32 likely become our default.
33 </note>
28 34
29<p>Both the Sun JDK/JRE and the IBM JDK/JRE are generally faster, but 35 <p>Both the Sun JDK/JRE and the IBM JDK/JRE are generally faster, but
30getting them is a bit more work, as you are required to read and 36 getting them is a bit more work, as you are required to read and
31accept their license before downloading (IBM additionally requires you 37 accept their license before downloading (IBM additionally requires you
32to register).</p> 38 to register).
39 </p>
33 40
34<p>Our ebuilds for the Sun and IBM JDK/JREs will notify you of where 41 <p>Our ebuilds for the Sun and IBM JDK/JREs will notify you of where
35to go to download them.</p> 42 to go to download them.
43 </p>
44
36</body> 45 </body>
37</section> 46 </section>
38 47
39<section> 48 <section>
40<title>Installing the Sun/IBM JDK/JREs</title> 49 <title>Installing the Sun/IBM JDK/JREs</title>
41<body> 50 <body>
51
42<p>If you run <c>emerge dev-java/sun-jdk-1.3.1</c> or <c>emerge 52 <p>If you run <c>emerge sun-jdk-1.3.1</c> or <c>emerge
43dev-java/ibm-jdk-1.3.1</c>, you will be notified that you are required 53 ibm-jdk-1.3.1</c>, you will be notified that you are required
44to download the actual tarballs yourself. This has to do with license 54 to download the actual tarballs yourself. This has to do with license
45restrictions for the Sun JDK/JRE (online click-wrap license) and 55 restrictions for the Sun JDK/JRE (online click-wrap license) and
46registration issues with the IBM JDK/JRE.</p> 56 registration issues with the IBM JDK/JRE.
57 </p>
47 58
48<note>There is also a dev-java/sun-jdk-1.4.0, but not all packages 59 <note>There is also a sun-jdk-1.4.0, but not all packages
49work nicely with Java 1.4, so you're on your own if you use the 1.4.0 60 work nicely with Java 1.4, so you're on your own if you use the 1.4.0
50JDK.</note> 61 JDK.
62 </note>
51 63
52<p>You should download the indicated file(s) into 64 <p>You should download the indicated file(s) into
53<path>/usr/portage/distfiles</path>. Once that is done, you can rerun 65 <path>/usr/portage/distfiles</path>. Once that is done, you can rerun
54the emerge command, then the JDK/JRE will be installed properly into 66 the emerge command, then the JDK/JRE will be installed properly into
55<path>/opt</path>.</p> 67 <path>/opt</path>.
68 </p>
69
56</body> 70 </body>
57</section> 71 </section>
58</chapter> 72 </chapter>
59 73
60<chapter> 74 <chapter>
61<title>Configuring your JDK/JRE</title> 75 <title>Configuring your JDK/JRE</title>
76
62<section> 77 <section>
63<title>Overview</title> 78 <title>Overview</title>
79
64<body> 80 <body>
81
65<p>Gentoo has the ability to have multiple JDKs and JREs installed 82 <p>Gentoo has the ability to have multiple JDKs and JREs installed
66without them conflicting. There are a few caveats to this, as noted 83 without them conflicting. There are a few caveats to this, as noted
67below.</p> 84 below.
85 </p>
68 86
69<p>Using the <c>java-config</c> tool, you can set the system-wide 87 <p>Using the <c>java-config</c> tool, you can set the system-wide
70default if you have root access. Users can also use <c>java-config</c> 88 default if you have root access. Users can also use <c>java-config</c>
71to set up their own personal default, that is different from the 89 to set up their own personal default, that is different from the
72system-wide default.</p> 90 system-wide default.
91 </p>
92
73</body> 93 </body>
74</section> 94 </section>
75 95
76<section> 96 <section>
77<title>Setting a default JDK/JRE</title> 97 <title>Setting a default JDK/JRE</title>
78<body> 98 <body>
99
79<p>Running the command <c>java-config --list-available-vms</c> will 100 <p>Running the command <c>java-config --list-available-vms</c> will
80give you a list of all availble JREs and JDKs on your system, thus:</p> 101 give you a list of all availble JREs and JDKs on your system, thus:</p>
81<pre> 102
103 <pre caption = "Listing available VMs">
82[%1 ~] java-config --list-available-vms 104[%1 ~] java-config --list-available-vms
83[blackdown-jdk-1.3.1] Blackdown JDK 1.3.1 (/etc/env.d/java/20blackdown-jdk-1.3.1) 105[blackdown-jdk-1.3.1] Blackdown JDK 1.3.1 (/etc/env.d/java/20blackdown-jdk-1.3.1)
84[blackdown-jre-1.3.1] Blackdown JRE 1.3.1 (/etc/env.d/java/20blackdown-jre-1.3.1) 106[blackdown-jre-1.3.1] Blackdown JRE 1.3.1 (/etc/env.d/java/20blackdown-jre-1.3.1)
85[ibm-jdk-1.3.0] IBM JDK 1.3.0 (/etc/env.d/java/20ibm-jdk-1.3.0) 107[ibm-jdk-1.3.0] IBM JDK 1.3.0 (/etc/env.d/java/20ibm-jdk-1.3.0)
86[ibm-jdk-1.3.1] IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1) 108[ibm-jdk-1.3.1] IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1)
87[ibm-jre-1.3.1] IBM JRE 1.3.1 (/etc/env.d/java/20ibm-jre-1.3.1) 109[ibm-jre-1.3.1] IBM JRE 1.3.1 (/etc/env.d/java/20ibm-jre-1.3.1)
88[sun-jdk-1.4.0] Sun JDK 1.4.0 (/etc/env.d/java/20sun-jdk-1.4.0) 110[sun-jdk-1.4.0] Sun JDK 1.4.0 (/etc/env.d/java/20sun-jdk-1.4.0)
89</pre> 111 </pre>
112
90<p>The name in the brackets <path>"[]"</path> is the handle or ID for 113 <p>The name in the brackets <path>"[]"</path> is the handle or ID for
91that particular VM. You use pass that ID to <c>java-config 114 that particular VM. You use pass that ID to <c>java-config
92--set-system-vm</c>, thus:</p> 115 --set-system-vm</c>, thus:
93<pre> 116 </p>
117
118 <pre caption = "Setting the System VM">
94[#1 ~] java-config --set-system-vm=ibm-jdk-1.3.1 119[#1 ~] java-config --set-system-vm=ibm-jdk-1.3.1
95Now using IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1) 120Now using IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1)
96</pre> 121 </pre>
97 122
98<note>You will have to be root to run --set-system-vm</note> 123 <note>You will have to be root to run --set-system-vm
124 </note>
99 125
100<p>Once you have issued <c>java-config --set-system-vm</c> with a 126 <p>Once you have issued <c>java-config --set-system-vm</c> with a
101particular VM ID, you will need to regenerate your /etc/profile.env, 127 particular VM ID, you will need to regenerate your /etc/profile.env,
102thus:</p> 128 thus:
103<pre> 129 </p>
130
131 <pre caption = "Regenerating /etc/profile.env" >
104[#1 ~] env-update 132[#1 ~] env-update
105</pre> 133 </pre>
106 134
107<p>After this, you will either want to relogin, or resource 135 <p>After this, you will either want to relogin, or resource
108<path>/etc/profile</path> into your environment.</p> 136 <path>/etc/profile</path> into your environment.
137 </p>
109 138
110<p>As a regular user, you can use <c>java-config --set-user-vm</c>, 139 <p>As a regular user, you can use <c>java-config --set-user-vm</c>,
111which will create <path>$HOME/.gentoo/java-env</path> with all 140 which will create <path>$HOME/.gentoo/java-env</path> with all
112required env vars. You would normally source this from your shell's 141 required env vars. You would normally source this from your shell's
113startup script (<path>$HOME/.zshenv</path> in my case).</p> 142 startup script (<path>$HOME/.zshenv</path> in my case).</p>
143
114</body> 144 </body>
115</section> 145 </section>
116 146
117<section> 147 <section>
118<title>Setting a default CLASSPATH</title> 148 <title>Setting a default CLASSPATH</title>
119<body> 149 <body>
150
120<p><c>java-config</c> can also be used to set a system-wide default 151 <p><c>java-config</c> can also be used to set a system-wide default
121CLASSPATH, and of course a user-specific default CLASSPATH.</p> 152 CLASSPATH, and of course a user-specific default CLASSPATH.
153 </p>
122 154
123<p>First you want to list available java libraries that might be 155 <p>First you want to list available java libraries that might be
124interesting to put in your CLASSPATH, thus:</p> 156 interesting to put in your CLASSPATH, thus:
125<pre> 157 </p>
158
159 <pre caption = "Listing classes">
126[%1 ~] java-config --list-available-packages 160[%1 ~] java-config --list-available-packages
127[ant] No description (/usr/share/ant/classpath.env) 161[ant] No description (/usr/share/ant/classpath.env)
128[java-gnome] No description (/usr/share/java-gnome/classpath.env) 162[java-gnome] No description (/usr/share/java-gnome/classpath.env)
129[java-gtk] No description (/usr/share/java-gtk/classpath.env) 163[java-gtk] No description (/usr/share/java-gtk/classpath.env)
130[log4j] "" (/usr/share/log4j/package.env) 164[log4j] "" (/usr/share/log4j/package.env)
131</pre> 165 </pre>
132 166
133<note>None of these packages have a proper description. That is 167 <note>None of these packages have a proper description. That is
134something that will be implemented in the not-so-distant 168 something that will be implemented in the not-so-distant
135future.</note> 169 future.
170 </note>
136 171
137<p>Again, the name in brackets <path>"[]"</path> are the IDs that you 172 <p>Again, the name in brackets <path>"[]"</path> are the IDs that you
138have to pass to <c>java-config --set-system-classpath</c>, thus:</p> 173 have to pass to <c>java-config --set-system-classpath</c>, thus:
139<pre> 174 </p>
175
176 <pre caption = "Setting classpaths">
140java-config --set-system-classpath=log4j,java-gtk,java-gnome 177java-config --set-system-classpath=log4j,java-gtk,java-gnome
141</pre> 178 </pre>
179
142<note>The current directory (.) will not be part of the system classpath, 180 <note>The current directory (.) will not be part of the system classpath,
143as that should be added in root's login profile.</note> 181 as that should be added in root's login profile.
182 </note>
183
144<p>Again, you will want to run <c>env-update</c> to update your 184 <p>Again, you will want to run <c>env-update</c> to update your
145system's environment, and you might also want to relogin or resource 185 system's environment, and you might also want to relogin or resource
146the <path>/etc/profile</path>.</p> 186 the <path>/etc/profile</path>.
187 </p>
188
147<p>For users, <c>java-config --set-user-classpath</c> will create 189 <p>For users, <c>java-config --set-user-classpath</c> will create
148<path>$HOME/.gentoo/java-env-classpath</path>, which is automatically 190 <path>$HOME/.gentoo/java-env-classpath</path>, which is automatically
149included by <path>$HOME/.gentoo/java-env</path>.</p> 191 included by <path>$HOME/.gentoo/java-env</path>.
192 </p>
193
150</body> 194 </body>
151</section> 195 </section>
152</chapter> 196 </chapter>
153 197
154<chapter> 198 <chapter>
155<title>Additional resources</title> 199 <title>Additional resources</title>
156<section> 200 <section>
157<title>Off-line resources</title> 201 <title>Off-line resources</title>
202
158<body> 203 <body>
159<ul> 204
205 <ul>
160<li>java-config man page</li> 206 <li>java-config man page</li>
161<li><c>java-config --help</c></li> 207 <li><c>java-config --help</c></li>
162<li>The <path>/usr/bin/java-config</path> script itself</li> 208 <li>The <path>/usr/bin/java-config</path> script itself</li>
163</ul> 209 </ul>
210
164</body> 211 </body>
165</section> 212 </section>
213
166<section> 214 <section>
167<title>Online resources</title> 215 <title>Online resources</title>
216
168<body> 217 <body>
169<ul> 218
170<li>The <uri link="http://lists.gentoo.org/pipermail/gentoo-dev/"> 219 <ul>
220 <li>The <uri link="http://news.gmane.org/gmane.linux.gentoo.devel">
171gentoo-dev </uri>, 221 gentoo-dev </uri>,
172<uri link="http://lists.gentoo.org/pipermail/gentoo-user/"> gentoo-user 222 <uri link="http://news.gmane.org/gmane.linux.gentoo.user"> gentoo-user
173</uri> mailing list archives</li> 223 </uri> mailing list archives</li>
174<li>#gentoo on irc.openprojects.net</li> 224 <li>#gentoo on irc.openprojects.net</li>
175</ul> 225 </ul>
226
176</body> 227 </body>
177</section> 228 </section>
178</chapter> 229 </chapter>
230
179<chapter> 231 <chapter>
180<title>Caveats</title> 232 <title>Caveats</title>
181<section> 233 <section>
182<title>General</title> 234 <title>General</title>
235
183<body> 236 <body>
237
184<p>If you select a JRE as your default VM, you may not have a 238 <p>If you select a JRE as your default VM, you may not have a
185<c>javac</c> command handy at all times, unless you have manually 239 <c>javac</c> command handy at all times, unless you have manually
186installed a symlink to take care of that.</p> 240 installed a symlink to take care of that.
241 </p>
187 242
188<p>Jikes will be used to compile some of the largest packages, if it 243 <p>Jikes will be used to compile some of the largest packages, if it
189is available. With time, we hope to be able to compile all 244 is available. With time, we hope to be able to compile all
190java-dependent packages with Jikes, so some dependencies on the JDK 245 java-dependent packages with Jikes, so some dependencies on the JDK
191can be replaced with a dependency on the JRE.</p> 246 can be replaced with a dependency on the JRE.</p>
192 247
193<p>With some versions of Portage, doing an <c>emerge --world 248 <p>With some versions of Portage, doing an <c>emerge --update world</c>
194update</c> will install the JDK regardless if whether you have it 249 will install the JDK regardless if whether you have it
195installed before or not. This is a known bug addressed in later 250 installed before or not. This is a known bug addressed in later
196versions of Portage.</p> 251 versions of Portage.
252 </p>
253
197</body> 254 </body>
198</section> 255 </section>
199</chapter> 256 </chapter>
200</guide> 257</guide>

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