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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 1.29 2006/08/09 20:44:33 rane 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>
7
5<author title="Author and Editor"> 8<author title="Author">
6<mail link="karltk@gentoo.org">Karl Trygve Kalleberg</mail> 9 <mail link="nichoj@gentoo.org">Joshua Nichols</mail>
7</author> 10</author>
11<author title="Author">
12 <mail link="karltk@gentoo.org">Karl Trygve Kalleberg</mail>
13</author>
14<author title="Editor">
15 <mail link="nightmorph@gentoo.org">Joshua Saddler</mail>
16</author>
8 17
9<abstract> 18<abstract>
10Users' and Developers' Guide to Java in Gentoo 19This guide will introduce you to Java and explain how to use Java with Gentoo
20Linux.
11</abstract> 21</abstract>
12 22
23<!-- The content of this document is licensed under the CC-BY-SA license -->
24<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
25<license/>
26
13<version>0.1.1</version> 27<version>0.7</version>
14<date>June 25, 2002</date> 28<date>2006-08-08</date>
15 29
16<chapter> 30<chapter>
17 31<title>What is Java?</title>
18<title>Installing a JDK/JRE</title>
19<section> 32<section>
20<title>Overview</title> 33<title>Overview</title>
21<body> 34<body>
22<p>Gentoo provides numerous JDKs and JREs. The default is the
23Blackdown JDK/JRE pair, as it is freely (beer) available without any
24registration fuss.</p>
25 35
26<note>As kaffe becomes a JRE/JDK drop-in replacement, that will most 36<p>
27likely become our default.</note> 37Java is a programming language developed by engineers of Sun Microsystems. The
38language is object-oriented and designed to run on multiple platforms without
39the need of recompiling code for each platform. Although Java can be compiled
40as a native program, much of Java's popularity can be attributed to its
41portability, along with other features such as garbage collection. To make
42platform independence possible the Java compiler compiles the Java code to an
43intermediate representation called "Java bytecode" that runs on a JRE (Java
44Runtime Environment) and not directly on the operating system.
45</p>
28 46
29<p>Both the Sun JDK/JRE and the IBM JDK/JRE are generally faster, but 47<p>
30getting them is a bit more work, as you are required to read and 48In order to run Java bytecode, one needs to have a JRE (Java Runtime
31accept their license before downloading (IBM additionally requires you 49Environment) installed. A JRE provides core libraries, a platform dependent
32to register).</p> 50Java Virtual Machine, plug-ins for browsers, among other things. A JDK (Java
51Development Kit) adds programming tools, such as a bytecode compiler and a
52debugger.
53</p>
33 54
34<p>Our ebuilds for the Sun and IBM JDK/JREs will notify you of where
35to go to download them.</p>
36</body> 55</body>
37</section>
38
39<section> 56</section>
40<title>Installing the Sun/IBM JDK/JREs</title> 57</chapter>
58
59<chapter>
60<title>New Java System</title>
61<section>
62<body>
63
64<p>
65The way Java is handled on Gentoo has recently seen many changes and
66improvements. This has only happened very recently, and as a result, all the
67packages related to it are marked with testing keywords, ie ~x86. This
68document assumes you are using the new system.
69</p>
70
41<body> 71</body>
42<p>If you run <c>emerge dev-java/sun-jdk-1.3.1</c> or <c>emerge 72</section>
43dev-java/ibm-jdk-1.3.1</c>, you will be notified that you are required 73<section>
44to download the actual tarballs yourself. This has to do with license 74<title>Keywords</title>
45restrictions for the Sun JDK/JRE (online click-wrap license) and 75<body>
46registration issues with the IBM JDK/JRE.</p>
47 76
48<note>There is also a dev-java/sun-jdk-1.4.0, but not all packages 77<p>
49work nicely with Java 1.4, so you're on your own if you use the 1.4.0 78If you are using the stable tree, i.e. x86, ppc, or amd64 as opposed to ~x86,
79~ppc, or ~amd64, you will need to add some entries to your
80<path>/etc/portage/package.keywords</path>:
81</p>
82
83<pre caption="package.keywords">
84# Core Gentoo/Java Packages
85dev-java/ant-core
86dev-java/ant-tasks
87dev-java/ant
88dev-java/java-config
89dev-java/java-config-wrapper
90dev-java/javatoolkit
91dev-java/sun-jce-bin
92# JDKs
93=dev-java/sun-jdk-1.4*
94=dev-java/sun-jdk-1.5*
95=dev-java/ibm-jdk-bin-1.4*
96=dev-java/ibm-jdk-bin-1.5*
97=dev-java/jrockit-jdk-bin-1.4*
98=dev-java/jrockit-jdk-bin-1.5*
99=dev-java/blackdown-jdk-1.4*
100dev-java/kaffe
101# JREs
102=dev-java/sun-jre-bin-1.4*
103=dev-java/sun-jre-bin-1.5*
104=dev-java/ibm-jre-bin-1.4*
105=dev-java/blackdown-jre-1.4*
106# Virtuals
107virtual/jdk
108virtual/jre
109# Compilers
110dev-java/eclipse-ecj
111dev-java/jikes
112# Documentation
113dev-java/java-sdk-docs
114# Misc packages that have been updated to generation-2,
115# where the generation-1 won't build and/or run properly
116dev-java/lucene
117# These have optional Java support, but need ~arch to function properly
118# with generation-2
119dev-util/subversion
120sys-libs/db
121</pre>
122
123<impo>
124It is crucial that you keyword ALL packages related to the new Java system,
125otherwise you will have problems in the later steps of this guide.
126</impo>
127
128<impo>
129It can't be emphasized enough that you have to have ALL the packages related
130to the new Java system keyworded for it to function properly.
131</impo>
132
133</body>
134</section>
135<section>
136<title>Existing installs</title>
137<body>
138
139<p>
140For existing installs, regardless of if you have installed anything Java
141before, make sure you have followed the <uri
142link="/proj/en/java/java-upgrade.xml">Java Upgrade Guide</uri>.
143</p>
144
145</body>
146</section>
147<section>
148<title>New installs</title>
149<body>
150
151<p>
152New installs should require no further preparation.
153</p>
154
155</body>
156</section>
157</chapter>
158
159<chapter>
160<title>Installing a Virtual Machine</title>
161<section>
162<title>The choices</title>
163<body>
164
165<p>
166Gentoo provides numerous Runtime Environments (JREs) and Development Kits
167(JDKs). Among the current choices, we have:
168</p>
169
170<table>
171<tr>
172 <th>Vendor</th>
173 <th>JDK</th>
174 <th>JRE</th>
175</tr>
176<tr>
177 <ti>The Blackdown Java Kit</ti>
178 <ti>dev-java/blackdown-jdk</ti>
179 <ti>dev-java/blackdown-jre</ti>
180</tr>
181<tr>
182 <ti>Sun's Java Kit</ti>
183 <ti>dev-java/sun-jdk</ti>
184 <ti>dev-java/sun-jre-bin</ti>
185</tr>
186<tr>
187 <ti>The IBM Java Kit</ti>
188 <ti>dev-java/ibm-jdk-bin</ti>
189 <ti>dev-java/ibm-jre-bin</ti>
190</tr>
191<tr>
192 <ti>The Compaq Java Kit for Alpha/Linux/GNU</ti>
193 <ti>dev-java/compaq-jdk</ti>
194 <ti>dev-java/compaq-jre</ti>
195</tr>
196<tr>
197 <ti>BEA WebLogic's J2SE Development Kit</ti>
198 <ti>dev-java/jrockit-jdk-bin</ti>
199</tr>
200</table>
201
202<!--
203TODO: list free implementations?
204note about not drop-in replacements
205kaffe/sablevm/gcj/jamvm
206-->
207
208<p>
209The default is Blackdown for both the JRE and the JDK, as it is freely ("free
210as in beer") available without any registration fuss.
211</p>
212
213<p>
214The default for Java 1.4 is the Blackdown JRE/JDK pair, as it is freely
215("free as in beer") available without any registration fuss.
216</p>
217
218<p>
219JREs and JDKs from Sun, IBM, and BEA are generally faster, but getting them
220is a bit more work, as you are required to read and accept their license before
221downloading (IBM additionally requires you to register).
222</p>
223
224</body>
225</section>
226<section>
227<title>Installing a JRE/JDKs</title>
228<body>
229
230<p>
231To install your profile's default JDK, you can run <c>emerge virtual/jdk</c>.
232Or to install your profile's default JRE, you can <c>emerge virtual/jre</c>.
233</p>
234
235<p>
236In recent events, Sun has relicensed their JDK and JRE under a more Linux
237distro friendly license. As a result, Sun releases Java 1.5 and onwards are
238freely downloadable, without any further hassle.
239</p>
240
241<note>
242A JDK also includes a JRE, so if you install a JDK you shouldn't have to also
243have to install a JRE.
50JDK.</note> 244</note>
51 245
246</body>
247</section>
248<section>
249<title>Installing fetch-restricted virtual machines</title>
250<body>
251
252<p>
253As already mentioned, some of the JDKs and JREs require you to jump through a
254few hoops before installing. Simply emerge the packages as you normally would.
255The ebuilds will then instruct you where to go and what to download.
256</p>
257
258<p>
52<p>You should download the indicated file(s) into 259You should download the indicated file(s) into
53<path>/usr/portage/distfiles</path>. Once that is done, you can rerun 260<path>/usr/portage/distfiles</path>. Once there, you can rerun the emerge
54the emerge command, then the JDK/JRE will be installed properly into 261command, at which point the JRE/JDK will be begin to install.
55<path>/opt</path>.</p> 262</p>
56</body>
57</section>
58</chapter>
59 263
264</body>
265</section>
60<chapter> 266</chapter>
61<title>Configuring your JDK/JRE</title> 267
268<chapter>
269<title>Configuring your virtual machine</title>
62<section> 270<section>
63<title>Overview</title> 271<title>Overview</title>
64<body> 272<body>
273
274<p>
65<p>Gentoo has the ability to have multiple JDKs and JREs installed 275Gentoo has the ability to have multiple JDKs and JREs installed without causing
66without them conflicting. There are a few caveats to this, as noted 276conflicts.
67below.</p> 277</p>
68 278
279<p>
69<p>Using the <c>java-config</c> tool, you can set the system-wide 280Using the <c>java-config</c> tool, you can set the system-wide default
70default if you have root access. Users can also use <c>java-config</c> 281(provided you have root access). Users can also use <c>java-config</c> to set
71to set up their own personal default, that is different from the 282up their own personal default.
72system-wide default.</p> 283</p>
73</body>
74</section>
75 284
285<note>
286You can also use <e>eselect</e> to change the system and user vm. See
287<c>eselect java-vm help</c>.
288</note>
289
290</body>
76<section> 291</section>
292<section>
77<title>Setting a default JDK/JRE</title> 293<title>Setting a default virtual machine</title>
78<body> 294<body>
295
296<p>
79<p>Running the command <c>java-config --list-available-vms</c> will 297Running the command <c>java-config --list-available-vms</c> will give you a
80give you a list of all availble JREs and JDKs on your system, thus:</p> 298list of all JREs and JDKs installed on your system. Here is an example of
299output:
300</p>
301
302<pre caption="Listing available VMs">
303# <i>java-config --list-available-vms</i>
3041) Blackdown JDK 1.3.1 [blackdown-jdk-1.3] (/etc/env.d/java/20blackdown-jdk-1.3)
3052) Blackdown JDK 1.4.2.02 [blackdown-jdk-1.4] (/etc/env.d/java/20blackdown-jdk-1.4)
3063) Blackdown JRE 1.4.2.02 [blackdown-jre-1.4] (/etc/env.d/java/20blackdown-jre-1.4)
3074) IBM JDK 1.4.2 [ibm-jdk-bin-1.4] (/etc/env.d/java/20ibm-jdk-bin-1.4)
3085) IBM JRE 1.4.2 [ibm-jre-bin-1.4] (/etc/env.d/java/20ibm-jre-bin-1.4)
3096) WebLogic JRockit 1.4.2.05 [jrockit-jdk-bin-1.4] (/etc/env.d/java/20jrockit-jdk-bin-1.4)
3107) WebLogic JRockit 1.5.0.03 [jrockit-jdk-bin-1.5] (/etc/env.d/java/20jrockit-jdk-bin-1.5)
3118) Sun JDK 1.3.1.13 [sun-jdk-1.3] (/etc/env.d/java/20sun-jdk-1.3)
3129) Sun JDK 1.4.2.09 [sun-jdk-1.4] (/etc/env.d/java/20sun-jdk-1.4)
313*) Sun JDK 1.5.0.04 [sun-jdk-1.5] (/etc/env.d/java/20sun-jdk-1.5)
31411) Sun JRE 1.4.2.09 [sun-jre-bin-1.4] (/etc/env.d/java/20sun-jre-bin-1.4)
31512) Sun JRE 1.5.0.04 [sun-jre-bin-1.5] (/etc/env.d/java/20sun-jre-bin-1.5)
81<pre> 316</pre>
82[%1 ~] java-config --list-available-vms 317
83[blackdown-jdk-1.3.1] Blackdown JDK 1.3.1 (/etc/env.d/java/20blackdown-jdk-1.3.1) 318<p>
84[blackdown-jre-1.3.1] Blackdown JRE 1.3.1 (/etc/env.d/java/20blackdown-jre-1.3.1) 319The <e>*</e> indicates this is the current active vm (system-vm or user-vm when
85[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)
87[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)
89</pre>
90<p>The name in the brackets <path>"[]"</path> is the handle or ID for 320set). The name in the brackets (<e>[]</e>) is the handle or ID for that
91that particular VM. You use pass that ID to <c>java-config 321particular VM. You use the handle or the number to <c>java-config
92--set-system-vm</c>, thus:</p> 322--set-system-vm</c>. Here is an example of how to set the system VM.
323</p>
324
325<pre caption="Setting the System VM">
326<comment>(By handle (preferred))</comment>
327# <i>java-config --set-system-vm blackdown-jdk-1.4</i>
328<comment>(By number)</comment>
329# <i>java-config --set-system-vm 2</i>
93<pre> 330</pre>
94[#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)
96</pre>
97 331
98<note>You will have to be root to run --set-system-vm</note>
99
100<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,
102thus:</p>
103<pre> 332<p>
104[#1 ~] env-update
105</pre>
106
107<p>After this, you will either want to relogin, or resource
108<path>/etc/profile</path> into your environment.</p>
109
110<p>As a regular user, you can use <c>java-config --set-user-vm</c>, 333As a regular user, you can use <c>java-config --set-user-vm</c>.
111which will create <path>$HOME/.gentoo/java-env</path> with all 334</p>
112required env vars. You would normally source this from your shell's
113startup script (<path>$HOME/.zshenv</path> in my case).</p>
114</body>
115</section>
116 335
336<note>
337You no longer have to <c>source</c> the profile for updates to the user/system
338VM take place.
339</note>
340
341</body>
117<section> 342</section>
343<section id="preferred-vm">
344<title>Preferred VM</title>
345<body>
346
347<p>
348While merging Java packages, the VM can and will be switched as necessary.
349</p>
350
351<p>
352Because of the wide variety of available VMs, we do not have the resources to
353test and verify every package works on all of them. So to ensure that every
354packages merges smoothly, we have defined a list of <e>default/supported
355VMs</e> per arch. You can find them in
356<path>/usr/share/java-config/config/jdk-defaults.conf</path>. When you are
357merging a Java package, and it detects one of the VM in that file is installed,
358it will automatically use that VM, instead of the system-vm.
359</p>
360
361<p>
362The merge time VM switching is also needed when, for example, your system-vm is
363set a 1.4 VM and the package you are merging requires a 1.5 VM. While merging
364it will use the preferred 1.5 VM, leaving your system-vm choice intact.
365</p>
366
367<p>
368Of course, Gentoo is all about choice, so you can override these defaults in
369<path>/etc/java-config-2/build/jdk.conf</path> and have complete control over
370which VM will get used. Some examples:
371</p>
372
373<pre caption="Example /etc/java-config-2/build/jdk.conf">
374<comment>(I always want it to use a sun-jdk, ie sun-jdk-1.4 for 1.4, sun-jdk-1.5 for 1.5, etc)</comment>
375*=sun-jdk
376</pre>
377
378<pre caption="Example /etc/java-config-2/build/jdk.conf">
379<comment>(Always use sun-jdk-1.5 wherever possible, except for when a 1.4 or 1.3 VM is explicitly required)</comment>
380*=sun-jdk-1.5
381</pre>
382
383<pre caption="Example /etc/java-config-2/build/jdk.conf">
384<comment># For 1.3 I prefer sun-jdk 1.4 but when it is not available, use ibm-jdk-bin,
385# For 1.4, use blackdown-jdk, and for 1.5, use sun-jdk </comment>
3861.3=sun-jdk-1.4 ibm-jdk-bin
3871.4=blackdown-jdk
3881.5=sun-jdk
389</pre>
390
391<warn>
392You do not have to edit this file. If you change these options to use a
393unsupported VM, things could possibly break. Bugs reported with a unsupported
394VM won't be prioritized as much as bugs present within supported VMs.
395</warn>
396
397</body>
398</section>
399</chapter>
400
401<chapter>
402<title>Compilers</title>
403<section>
404<body>
405
406<p>
407The standard Java compiler used for building is javac, which comes with each
408JDK. In addition to configuring the VM used at build time, it is also possible
409configure which compiler is used. Essentially, you define a list your
410preference for which compiler to use in
411<path>/etc/java-config-2/build/compilers.conf</path>.
412</p>
413
414<pre caption="/etc/java-config-2/build/compilers.conf">
415# If the ebuild supports it
416# it will check the COMPILERS var front to back and
417# use the first compiler that is installed
418
419COMPILERS="ecj-3.1 jikes javac"
420</pre>
421
422<p>
423Some compilers don't support all possible -target and -source arguments.
424Therefore, each compiler in the list is checked to see if it can support the
425desired -source/-target. javac will work in all cases, so if no other suitable
426compiler is found, it will be used instead.
427</p>
428
429<p>
430More details about each compiler are provided below:
431</p>
432
433<table>
434<tr>
435 <th>Name</th>
436 <th>Handle</th>
437 <th>Package</th>
438 <th>Description</th>
439</tr>
440<tr>
441 <ti>javac</ti>
442 <ti>javac</ti>
443 <ti>N/A</ti>
444 <ti>
445 This is the default compiler that will be used, and comes with each JDK.
446 </ti>
447</tr>
448<tr>
449 <ti>jikes</ti>
450 <ti>jikes</ti>
451 <ti>dev-java/jikes</ti>
452 <ti>
453 Jikes was originally developed by IBM. Anecdotally, it is generally quicker
454 than javac. Note however, that it is more pedantic, and will fail under a
455 few circumstances where javac has no issue. It also does not support Java
456 1.5 syntax yet.
457 </ti>
458</tr>
459<tr>
460 <ti>Eclipse Compiler for Java</ti>
461 <ti>ecj-3.1</ti>
462 <ti>=dev-java/eclipse-ecj-3.1*</ti>
463 <ti>
464 ECJ is the compiler used by the Eclipse software development kit. It is
465 very full featured, and is pretty fast. It does support Java 1.5 syntax.
466 </ti>
467</tr>
468</table>
469
470</body>
471</section>
472</chapter>
473
474<chapter>
118<title>Setting a default CLASSPATH</title> 475<title>Setting a default CLASSPATH</title>
476<section>
119<body> 477<body>
478
479<warn>
480The options explained in this section should be considered deprecated and will
481most likely be removed in the future. We strongly recommend against using
482these, because your Java projects or application should ideally manage their
483own classpaths. If you choose to specify a default CLASSPATH, some applications
484may behave unexpectedly, because classes they weren't expecting would be on the
485classpath.
486</warn>
487
488<p>
120<p><c>java-config</c> can also be used to set a system-wide default 489<c>java-config</c> can also be used to set a system-wide default CLASSPATH, as
121CLASSPATH, and of course a user-specific default CLASSPATH.</p> 490well a user-specific default CLASSPATH.
491</p>
122 492
123<p>First you want to list available java libraries that might be 493<p>
124interesting to put in your CLASSPATH, thus:</p> 494First, you will want to list available Java libraries installed on your system
495that might want to be put in your CLASSPATH. Here is an example of output:
496</p>
497
498<pre caption="Listing classes">
499# <i>java-config --list-available-packages</i>
500[xerces-2] The next generation of high performance, fully compliant XML parsers in the Apache Xerces family (/usr/share/xerces-2/package.env)
501[junit] Simple framework to write repeatable tests (/usr/share/junit/package.env)
502[bsh] BeanShell: A small embeddable Java source interpreter (/usr/share/bsh/package.env)
503[bcel] The Byte Code Engineering Library: analyze, create, manipulate Java class files (/usr/share/bcel/package.env)
504[log4j] A low-overhead robust logging package for Java (/usr/share/log4j/package.env)
505...
125<pre> 506</pre>
126[%1 ~] java-config --list-available-packages 507
127[ant] No description (/usr/share/ant/classpath.env) 508<p>
128[java-gnome] No description (/usr/share/java-gnome/classpath.env) 509Again, the names in brackets (<e>[]</e>) are the IDs that you have to pass to
129[java-gtk] No description (/usr/share/java-gtk/classpath.env) 510<c>java-config --set-system-classpath</c>. Here is an example:
130[log4j] "" (/usr/share/log4j/package.env)
131</pre> 511</p>
132 512
133<note>None of these packages have a proper description. That is 513<pre caption="Setting classpaths">
134something that will be implemented in the not-so-distant 514# <i>java-config --set-system-classpath log4j,xerces-2</i>
135future.</note>
136
137<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>
139<pre> 515</pre>
140java-config --set-system-classpath=log4j,java-gtk,java-gnome 516
517<note>
518The current directory (<path>.</path>) will not be part of the system
519classpath, as that should be added in your system's login profile.
520</note>
521
522<p>
523You will have to update your environment by logging out, then in again or
524sourcing <path>/etc/profile</path>.
141</pre> 525</p>
142<note>The current directory (.) will not be part of the system classpath, 526
143as that should be added in root's login profile.</note> 527<p>
144<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
146the <path>/etc/profile</path>.</p>
147<p>For users, <c>java-config --set-user-classpath</c> will create 528For users, <c>java-config --set-user-classpath</c> will create
148<path>$HOME/.gentoo/java-env-classpath</path>, which is automatically 529<path>~/.gentoo/java-env-classpath</path>, which you should then source from
149included by <path>$HOME/.gentoo/java-env</path>.</p> 530your shell's profile.
531</p>
532
533<pre caption="Sourcing user specific classpath">
534<i>if [[ -f "${HOME}/.gentoo/java-env-classpath" ]]; then
535 source ${HOME}/.gentoo/java-env-classpath
536fi</i>
537</pre>
538
539<p>
540If you really want a system wide or user default classpath you can add
541something like the following to your shell's profile. But we would advise
542against it.
543</p>
544
545<pre caption="Setting classpath">
546# <i>export CLASSPATH="${CLASSPATH}:$(java-config --classpath log4j,xerces-2)"</i>
547</pre>
548
549</body>
550</section>
551</chapter>
552
553<chapter>
554<title>USE flags for use with Java</title>
555<section>
556<title>Setting USE flags</title>
557<body>
558
559<p>
560For more information regarding USE flags, refer to the <uri
561link="/doc/en/handbook/handbook-x86.xml?part=2&amp;chap=2">USE flags</uri>
562chapter from the Gentoo Handbook.
563</p>
564
565</body>
566</section>
567<section>
568<title>The flags</title>
569<body>
570
571<ul>
572 <li>The <b>java</b> flag adds support for Java in a variety of programs</li>
573 <li>
574 The <b>nsplugin</b> flag adds support for Mozilla-like browsers (including
575 Firefox).You will need this for viewing Java applets in your Mozilla-like
576 browser.
577 </li>
578 <li>
579 The <b>doc</b> flag will typically install API documentation, as generated
580 by javadoc.
581 </li>
582 <li>
583 The <b>source</b> flag will install a zip of the package's source code.
584 This is typically used to provide your IDE with the source code for the
585 package.
586 </li>
587 <li>
588 The <b>source</b> flag installs a zip of the source code of a package.
589 This is traditionally used for for IDEs to 'attach' source to the libraries
590 you are using.
591 </li>
592 <li>
593 For Java packages, the <b>doc</b> flag will build API documentation using
594 javadoc.
595 </li>
596</ul>
597
150</body> 598</body>
151</section> 599</section>
152</chapter> 600</chapter>
153 601
154<chapter> 602<chapter>
155<title>Additional resources</title> 603<title>Additional resources</title>
156<section> 604<section>
157<title>Off-line resources</title> 605<title>Off-line resources</title>
158<body> 606<body>
607
159<ul> 608<ul>
160<li>java-config man page</li> 609 <li>java-config man page</li>
161<li><c>java-config --help</c></li> 610 <li><c>java-config --help</c></li>
162<li>The <path>/usr/bin/java-config</path> script itself</li>
163</ul> 611</ul>
612
164</body> 613</body>
165</section> 614</section>
166<section> 615<section>
167<title>Online resources</title> 616<title>Online resources</title>
168<body> 617<body>
618
169<ul> 619<ul>
170<li>The <uri link="http://lists.gentoo.org/pipermail/gentoo-dev/"> 620 <li>
171gentoo-dev </uri>, 621 The <uri link="http://www.gentoo.org/proj/en/java/">Java Project
172<uri link="http://lists.gentoo.org/pipermail/gentoo-user/"> gentoo-user 622 Page</uri>
623 </li>
624 <li>
625 The <uri
626 link="http://news.gmane.org/gmane.linux.gentoo.java">gentoo-java</uri>,
627 <uri
628 link="http://news.gmane.org/gmane.linux.gentoo.user">gentoo-user</uri>, and
629 <uri
630 link="http://news.gmane.org/gmane.linux.gentoo.devel">gentoo-dev</uri>
173</uri> mailing list archives</li> 631 mailing list archives
174<li>#gentoo on irc.openprojects.net</li> 632 </li>
633 <li>#gentoo and #gentoo-java on irc.freenode.net</li>
634 <li>
635 <uri
636 link="http://en.wikipedia.org/wiki/Java_programming_language">Wikipedia's
637 entry for Java</uri>
638 </li>
175</ul> 639</ul>
176</body>
177</section>
178</chapter>
179<chapter>
180<title>Caveats</title>
181<section>
182<title>General</title>
183<body>
184<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
186installed a symlink to take care of that.</p>
187 640
188<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
190java-dependent packages with Jikes, so some dependencies on the JDK
191can be replaced with a dependency on the JRE.</p>
192
193<p>With some versions of Portage, doing an <c>emerge --world
194update</c> will install the JDK regardless if whether you have it
195installed before or not. This is a known bug addressed in later
196versions of Portage.</p>
197</body> 641</body>
198</section> 642</section>
199</chapter> 643</chapter>
200</guide> 644</guide>

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