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1<?xml version="1.0" encoding="UTF-8"?> 1<?xml version="1.0" encoding="UTF-8"?>
2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/java.xml,v 1.14 2005/03/06 12:08:19 swift Exp $ --> 2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/java.xml,v 1.44 2009/10/07 18:14:31 nightmorph Exp $ -->
3<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> 3<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
4 4
5<guide link="/doc/en/java.xml"> 5<guide link="/doc/en/java.xml">
6<title>Gentoo Java Guide</title> 6<title>Gentoo Java Guide</title>
7 7
8<author title="Author and Editor"> 8<author title="Author">
9 <mail link="nichoj@gentoo.org">Joshua Nichols</mail>
10</author>
11<author title="Author">
9 <mail link="karltk@gentoo.org">Karl Trygve Kalleberg</mail> 12 <mail link="karltk@gentoo.org">Karl Trygve Kalleberg</mail>
10</author> 13</author>
11<author title="Editor"> 14<author title="Editor">
12 <mail link="swift@gentoo.org">Sven Vermeulen</mail> 15 <mail link="nightmorph@gentoo.org">Joshua Saddler</mail>
13</author> 16</author>
14<author title="Editor">
15 <mail link="marcelogoes@gmail.com">Marcelo Góes</mail>
16</author>
17 17
18<abstract> 18<abstract>
19This guide will introduce users and developers to Java and explain how to use 19This guide will introduce you to Java and explain how to use Java with Gentoo
20Java with Gentoo Linux. 20Linux.
21</abstract> 21</abstract>
22 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 -->
23<license/> 25<license/>
24 26
25<version>0.1.6</version> 27<version>0.19</version>
26<date>2005-03-06</date> 28<date>2009-10-07</date>
27 29
28<chapter> 30<chapter>
29<title>What is Java?</title> 31<title>What is Java?</title>
30<section> 32<section>
31<title>Overview</title> 33<title>Overview</title>
32<body> 34<body>
33 35
34<p> 36<p>
35Java is a programming language developed by engineers of Sun Microsystems. 37Java is a programming language developed by engineers of Sun Microsystems. The
36The language is object-oriented and designed to run on multiple platforms 38language is object-oriented and designed to run on multiple platforms without
37without the need of recompiling code for each platform. Although Java can 39the need of recompiling code for each platform. Although Java can be compiled
38be compiled as a native program, much of Java's popularity can be attributed 40as a native program, much of Java's popularity can be attributed to its
39to its portability, along with other features such as garbage collection. 41portability, along with other features such as garbage collection. To make
40The ability to compile once and run in various platforms is achieved through 42platform independence possible the Java compiler compiles the Java code to an
41the use of just-in-time compilers (JIT), which compile Java bytecodes into 43intermediate representation called "Java bytecode" that runs on a JRE (Java
42native code when a given program is run. 44Runtime Environment) and not directly on the operating system.
43</p>
44
45<p> 45</p>
46
47<p>
46In order to run Java bytecodes, one needs to have a JRE (Java Runtime Environment) 48In order to run Java bytecode, one needs to have a JRE (Java Runtime
47installed. A JRE provides core libraries, a platform dependent Java Virtual Machine, 49Environment) installed. A JRE provides core libraries, a platform dependent
48plug-ins for browsers, among other things. A JDK (Java Development Kit) adds 50Java Virtual Machine, plugins for browsers, among other things. A JDK (Java
49programming tools, such as a bytecode compiler and a debugger. 51Development Kit) adds programming tools, such as a bytecode compiler and a
52debugger.
50</p> 53</p>
51 54
52</body> 55</body>
53</section> 56</section>
54</chapter>
55
56<chapter> 57</chapter>
57<title>Installing a JRE/JDK</title> 58
59<chapter>
60<title>Before You Begin</title>
61<section>
62<title>Existing installs</title>
63<body>
64
65<p>
66For existing installs, regardless of if you have installed anything Java
67before, make sure you have followed the <uri
68link="/proj/en/java/java-upgrade.xml">Java Upgrade Guide</uri>.
69</p>
70
71</body>
72</section>
73<section>
74<title>New installs</title>
75<body>
76
77<p>
78New installs should require no further preparation.
79</p>
80
81</body>
82</section>
83</chapter>
84
85<chapter>
86<title>Installing a Virtual Machine</title>
58<section> 87<section>
59<title>The choices</title> 88<title>The choices</title>
60<body> 89<body>
61 90
62<p> 91<p>
63Gentoo provides numerous JREs and JDKs. Among the current alternatives, we have: 92Gentoo provides numerous Runtime Environments (JREs) and Development Kits
64</p> 93(JDKs). Among the current choices, we have:
65
66<ul>
67<li>blackdown-jre and blackdown-jdk, the Blackdown Java Kit</li>
68<li>sun-jre-bin and sun-jdk, Sun's Java Kit </li>
69<li>ibm-jre-bin and ibm-jdk-bin, the IBM Java Kit</li>
70<li>compaq-jre and compaq-jdk, the Compaq Java Kit for Alpha/Linux/GNU</li>
71<li>jrockit-jdk-bin, BEA WebLogic's J2SE Development Kit</li>
72</ul>
73
74<p> 94</p>
75The default is the Blackdown JRE/JDK 95
76pair, as it is freely ("free as in beer") available without any registration 96<table>
77fuss. 97<tr>
98 <th>Vendor</th>
99 <th>JDK</th>
100 <th>JRE</th>
101</tr>
102<tr>
103 <ti>The Blackdown Java Kit</ti>
104 <ti>dev-java/blackdown-jdk</ti>
105 <ti>dev-java/blackdown-jre</ti>
106</tr>
107<tr>
108 <ti>Sun's Java Kit</ti>
109 <ti>dev-java/sun-jdk</ti>
110 <ti>dev-java/sun-jre-bin</ti>
111</tr>
112<tr>
113 <ti>The IBM Java Kit</ti>
114 <ti>dev-java/ibm-jdk-bin</ti>
115 <ti>dev-java/ibm-jre-bin</ti>
116</tr>
117<tr>
118 <ti>BEA WebLogic's J2SE Development Kit</ti>
119 <ti>dev-java/jrockit-jdk-bin</ti>
120</tr>
121</table>
122
123<!--
124TODO: list free implementations?
125note about not drop-in replacements
126kaffe/sablevm/gcj/jamvm
127-->
78</p> 128<p>
79 129The default for Java 1.6 is the Sun JRE/JDK pair.
80<p> 130</p>
81Both the Sun JRE/JDK and the IBM JRE/JDK are generally faster, but getting them
82is a bit more work, as you are required to read and accept their license before
83downloading (IBM additionally requires you to register).
84</p>
85 131
86<p>
87Our ebuilds for the Sun and IBM JRE/JDKs will notify you of where to go to
88download them.
89</p>
90
91</body> 132</body>
92</section>
93
94<section> 133</section>
134<section>
95<title>Installing the Sun/IBM JRE/JDKs</title> 135<title>Installing a JRE/JDKs</title>
96<body> 136<body>
97 137
138<p>
139To install your profile's default JDK, you can run <c>emerge virtual/jdk</c>.
140Or to install your profile's default JRE, you can <c>emerge virtual/jre</c>.
98<p> 141</p>
99If you run <c>emerge =sun-jdk-1.4.2.06</c> or <c>=ibm-jdk-bin-1.4.2</c>, you will 142
100be notified that you are required to download the actual tarballs yourself. This 143<p>
101has to do with license restrictions for the Sun JRE/JDK (online click-wrap 144In recent events, Sun has relicensed their JDK and JRE under a more Linux
102license) and registration issues with the IBM JRE/JDK. 145distro friendly license. As a result, Sun releases Java 1.5 and onwards are
146freely downloadable, without any further hassle.
103</p> 147</p>
104 148
105<note> 149<note>
106ibm-jdk-bin is currently masked, you may have to unmask it to use it. 150A JDK also includes a JRE, so if you install a JDK you shouldn't have to also
151have to install a JRE.
107</note> 152</note>
108 153
154</body>
155</section>
156<section>
157<title>Installing fetch-restricted virtual machines</title>
158<body>
159
160<p>
161Some of the JDKs and JREs require you to jump through a few hoops before
162installing. Simply emerge the packages as you normally would. The ebuilds will
163then instruct you where to go and what to download.
164</p>
165
109<p> 166<p>
110You should download the indicated file(s) into 167You should download the indicated file(s) into
111<path>/usr/portage/distfiles</path>. Once that is done, you can rerun the emerge 168<path>/usr/portage/distfiles</path>. Once there, you can rerun the emerge
112command, then the JRE/JDK will be installed properly into <path>/opt</path>. 169command, at which point the JRE/JDK will be begin to install.
113</p> 170</p>
114 171
115</body> 172</body>
116</section> 173</section>
117</chapter>
118
119<chapter> 174</chapter>
120<title>Configuring your JRE/JDK</title> 175
176<chapter>
177<title>Configuring your virtual machine</title>
121<section> 178<section>
122<title>Overview</title> 179<title>Overview</title>
123<body> 180<body>
124 181
125<p> 182<p>
126Gentoo has the ability to have multiple JDKs and JREs installed without them 183Gentoo has the ability to have multiple JDKs and JREs installed without causing
127conflicting. 184conflicts.
128</p>
129
130<p> 185</p>
186
187<p>
131Using the <c>java-config</c> tool, you can set the system-wide default if you 188Using the <c>java-config</c> tool, you can set the system-wide default
132have root access. Users can also use <c>java-config</c> to set up their own 189(provided you have root access). Users can also use <c>java-config</c> to set
133personal default, that is different from the system-wide default. 190up their own personal default.
134</p> 191</p>
135 192
136</body> 193<note>
137</section> 194You can also use <e>eselect</e> to change the system and user vm. See
195<c>eselect java-vm help</c>.
196</note>
138 197
198</body>
139<section> 199</section>
200<section>
140<title>Setting a default JRE/JDK</title> 201<title>Setting a default virtual machine</title>
141<body> 202<body>
142 203
143<p> 204<p>
144Running the command <c>java-config --list-available-vms</c> will give you a list 205Running the command <c>java-config --list-available-vms</c> will give you a
145of all available JREs and JDKs on your system. Here is an example of output: 206list of all JREs and JDKs installed on your system. Here is an example of
207output:
146</p> 208</p>
147 209
148<pre caption="Listing available VMs"> 210<pre caption="Listing available VMs">
149# <i>java-config --list-available-vms</i> 211# <i>java-config --list-available-vms</i>
150[blackdown-jdk-1.3.1] Blackdown JDK 1.3.1 (/etc/env.d/java/20blackdown-jdk-1.3.1) 212The following VMs are available for generation-2:
151[blackdown-jre-1.3.1] Blackdown JRE 1.3.1 (/etc/env.d/java/20blackdown-jre-1.3.1) 2131) Blackdown JDK 1.4.2.03 [blackdown-jdk-1.4.2] <comment>(Build Only)</comment>
152[ibm-jdk-1.3.0] IBM JDK 1.3.0 (/etc/env.d/java/20ibm-jdk-1.3.0) 2142) Blackdown JRE 1.4.2.03 [blackdown-jre-1.4.2] <comment>(Build Only)</comment>
153[ibm-jdk-1.3.1] IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1) 2153) IcedTea6-bin 1.4.1 [icedtea6-bin]
154[ibm-jre-1.3.1] IBM JRE 1.3.1 (/etc/env.d/java/20ibm-jre-1.3.1) 2164) Sun JDK 1.5.0.20 [sun-jdk-1.5] <comment>(Build Only)</comment>
155[sun-jdk-1.4.0] Sun JDK 1.4.0 (/etc/env.d/java/20sun-jdk-1.4.0) 217*) Sun JDK 1.6.0.16 [sun-jdk-1.6]
156</pre> 218</pre>
157 219
220<note>
221VMs marked as Build Only may contain security vulnerabilities and/or be EOL.
222Gentoo recommends not setting these VMs as either your system or user VM.
223Please see <uri link="java.xml#build-only">Build Only VM</uri> for more
224information.
225</note>
226
158<p> 227<p>
228The <e>*</e> indicates this is the current active vm (system-vm or user-vm when
159The name in the brackets <path>"[]"</path> is the handle or ID for that 229set). The name in the brackets (<e>[]</e>) is the handle or ID for that
160particular VM. You use pass that ID to <c>java-config --set-system-vm</c>. Here is 230particular VM. You use the handle or the number to <c>java-config
161an example of how to set the system VM. 231--set-system-vm</c>. Here is an example of how to set the system VM.
162</p> 232</p>
163 233
164<pre caption="Setting the System VM"> 234<pre caption="Setting the System VM">
235<comment>(By handle (preferred))</comment>
165# <i>java-config --set-system-vm=ibm-jdk-1.3.1</i> 236# <i>java-config --set-system-vm blackdown-jdk-1.4</i>
166Now using IBM JDK 1.3.1 (/etc/env.d/java/20ibm-jdk-1.3.1) 237Now using blackdown-jdk-1.4 as your generation-2 system JVM
238WARNING: blackdown-jdk-1.4 is marked as a build-only JVM. Using this vm is not recommended.
239<comment>(By number)</comment>
240# <i>java-config --set-system-vm 5</i>
241Now using sun-jdk-1.6 as your generation-2 system JVM
242</pre>
243
244<p>
245As a regular user, you can use <c>java-config --set-user-vm</c>.
167</pre> 246</p>
168 247
169<note> 248<note>
170You will have to be root to run --set-system-vm. 249You no longer have to <c>source</c> the profile for updates to the user/system
250VM take place.
171</note> 251</note>
172 252
173<p>
174Once you have issued <c>java-config --set-system-vm</c> with a particular VM ID,
175you will need to regenerate your /etc/profile.env. You can do it like this:
176</p>
177
178<pre caption="Regenerating /etc/profile.env" >
179# <i>env-update</i>
180</pre>
181
182<p>
183After this, you will either want to relogin, or resource
184<path>/etc/profile</path> into your environment.
185</p>
186
187<p>
188As a regular user, you can use <c>java-config --set-user-vm</c>, which will
189create <path>~/.gentoo/java-env</path> with all required env vars. You would
190normally source this from your shell's startup script
191(generally <path>~/.bashrc</path>).
192</p>
193
194</body> 253</body>
195</section>
196
197<section> 254</section>
255<section id="build-only">
256<title>Build Only VM</title>
257<body>
258
259<p>
260Some virtual machines are flagged as build-only due to being EOL and/or
261containing security vulnerabilities. These virtual machines will not
262automatically be used by Gentoo for the running of applications using Gentoo
263launchers but will still be available for use by Gentoo's build environment as
264some packages may require them for building. The setting of these virtual
265machines as either your system or user VM is strongly discouraged as these VMs
266will then be used when running the <path>/usr/bin/{java,javac,..}</path>
267executables and will also be used by any packages not using Gentoo's launcher
268scripts.
269</p>
270
271</body>
272</section>
273<section id="preferred-vm">
274<title>Preferred VM</title>
275<body>
276
277<p>
278While merging Java packages, the VM can and will be switched as necessary.
279</p>
280
281<p>
282Because of the wide variety of available VMs, we do not have the resources to
283test and verify every package works on all of them. So to ensure that every
284packages merges smoothly, we have defined a list of <e>default/supported
285VMs</e> per arch. You can find them in
286<path>/usr/share/java-config-2/config/jdk-defaults.conf</path>. When you are
287merging a Java package, and it detects one of the VM in that file is installed,
288it will automatically use that VM, instead of the system-vm.
289</p>
290
291<p>
292The merge time VM switching is also needed when, for example, your system-vm is
293set a 1.4 VM and the package you are merging requires a 1.5 VM. While merging
294it will use the preferred 1.5 VM, leaving your system-vm choice intact.
295</p>
296
297<p>
298Of course, Gentoo is all about choice, so you can override these defaults in
299<path>/etc/java-config-2/build/jdk.conf</path> and have complete control over
300which VM will get used. Some examples:
301</p>
302
303<pre caption="Example /etc/java-config-2/build/jdk.conf">
304<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>
305*=sun-jdk
306</pre>
307
308<pre caption="Example /etc/java-config-2/build/jdk.conf">
309<comment>(Always use sun-jdk-1.5 wherever possible, except for when a 1.4 or 1.3 VM is explicitly required)</comment>
310*=sun-jdk-1.5
311</pre>
312
313<pre caption="Example /etc/java-config-2/build/jdk.conf">
314<comment># For 1.3 I prefer sun-jdk 1.4 but when it is not available, use ibm-jdk-bin,
315# For 1.4, use blackdown-jdk, and for 1.5, use sun-jdk </comment>
3161.3=sun-jdk-1.4 ibm-jdk-bin
3171.4=blackdown-jdk
3181.5=sun-jdk
319</pre>
320
321<warn>
322You do not have to edit this file. If you change these options to use a
323unsupported VM, things could possibly break. Bugs reported with a unsupported
324VM won't be prioritized as much as bugs present within supported VMs.
325</warn>
326
327</body>
328</section>
329</chapter>
330
331<chapter>
332<title>Compilers</title>
333<section>
334<body>
335
336<p>
337The standard Java compiler used for building is javac, which comes with each
338JDK. In addition to configuring the VM used at build time, it is also possible
339configure which compiler is used. Essentially, you define a list your
340preference for which compiler to use in
341<path>/etc/java-config-2/build/compilers.conf</path>.
342</p>
343
344<pre caption="/etc/java-config-2/build/compilers.conf">
345# If the ebuild supports it
346# it will check the COMPILERS var front to back and
347# use the first compiler that is installed
348
349COMPILERS="ecj-3.1 jikes javac"
350</pre>
351
352<p>
353Some compilers don't support all possible -target and -source arguments.
354Therefore, each compiler in the list is checked to see if it can support the
355desired -source/-target. javac will work in all cases, so if no other suitable
356compiler is found, it will be used instead.
357</p>
358
359<p>
360More details about each compiler are provided below:
361</p>
362
363<table>
364<tr>
365 <th>Name</th>
366 <th>Handle</th>
367 <th>Package</th>
368 <th>Description</th>
369</tr>
370<tr>
371 <ti>javac</ti>
372 <ti>javac</ti>
373 <ti>N/A</ti>
374 <ti>
375 This is the default compiler that will be used, and comes with each JDK.
376 </ti>
377</tr>
378<tr>
379 <ti>jikes</ti>
380 <ti>jikes</ti>
381 <ti>dev-java/jikes</ti>
382 <ti>
383 Jikes was originally developed by IBM. Anecdotally, it is generally quicker
384 than javac. Note however, that it is more pedantic, and will fail under a
385 few circumstances where javac has no issue. It also does not support Java
386 1.5 syntax yet.
387 </ti>
388</tr>
389<tr>
390 <ti>Eclipse Compiler for Java</ti>
391 <ti>ecj-3.1</ti>
392 <ti>=dev-java/eclipse-ecj-3.1*</ti>
393 <ti>
394 ECJ is the compiler used by the Eclipse software development kit. It is
395 very full featured, and is pretty fast. It does support Java 1.5 syntax.
396 </ti>
397</tr>
398</table>
399
400</body>
401</section>
402</chapter>
403
404<chapter>
198<title>Setting a default CLASSPATH</title> 405<title>Setting a default CLASSPATH</title>
406<section>
199<body> 407<body>
200 408
409<warn>
410The options explained in this section should be considered deprecated and will
411most likely be removed in the future. We strongly recommend against using
412these, because your Java projects or application should ideally manage their
413own classpaths. If you choose to specify a default CLASSPATH, some applications
414may behave unexpectedly, because classes they weren't expecting would be on the
415classpath.
416</warn>
417
201<p> 418<p>
202<c>java-config</c> can also be used to set a system-wide default CLASSPATH, and 419<c>java-config</c> can also be used to set a system-wide default CLASSPATH, as
203of course a user-specific default CLASSPATH. 420well a user-specific default CLASSPATH.
204</p>
205
206<p> 421</p>
207First you want to list available java libraries that might be interesting to put 422
423<p>
424First, you will want to list available Java libraries installed on your system
208in your CLASSPATH. Here is an example of output: 425that might want to be put in your CLASSPATH. Here is an example of output:
209</p> 426</p>
210 427
211<pre caption="Listing classes"> 428<pre caption="Listing classes">
212# <i>java-config --list-available-packages</i> 429# <i>java-config --list-available-packages</i>
213[bsh] BeanShell is a small, free, embeddable, Java 430[xerces-2] The next generation of high performance, fully compliant XML parsers in the Apache Xerces family (/usr/share/xerces-2/package.env)
214source interpreter with object scripting language 431[junit] Simple framework to write repeatable tests (/usr/share/junit/package.env)
215features. (/usr/share/bsh/package.env) 432[bsh] BeanShell: A small embeddable Java source interpreter (/usr/share/bsh/package.env)
216[oro] A set of text-processing Java classes that 433[bcel] The Byte Code Engineering Library: analyze, create, manipulate Java class files (/usr/share/bcel/package.env)
217provide Perl5 compatible regular expressions, AWK-like 434[log4j] A low-overhead robust logging package for Java (/usr/share/log4j/package.env)
218regular expressions, glob expressions, and utility
219classes for performing substitutions, splits, filtering
220filenames, etc. (/usr/share/oro/package.env)
221[bcel] The Byte Code Engineering Library: analyze, create,
222manipulate Java class files (/usr/share/bcel/package.env)
223[jsch] JSch is a pure Java implementation of SSH2.
224(/usr/share/jsch/package.env)
225... 435...
226</pre> 436</pre>
227 437
228<p> 438<p>
229Again, the name in brackets <path>"[]"</path> are the IDs that you have to pass 439Again, the names in brackets (<e>[]</e>) are the IDs that you have to pass to
230to <c>java-config --set-system-classpath</c>. Here is an example: 440<c>java-config --set-system-classpath</c>. Here is an example:
231</p> 441</p>
232 442
233<pre caption="Setting classpaths"> 443<pre caption="Setting classpaths">
234# <i>java-config --set-system-classpath=log4j,java-gtk,java-gnome</i> 444# <i>java-config --set-system-classpath log4j,xerces-2</i>
235</pre> 445</pre>
236 446
237<note> 447<note>
238The current directory (.) will not be part of the system classpath, as that 448The current directory (<path>.</path>) will not be part of the system
239should be added in root's login profile. 449classpath, as that should be added in your system's login profile.
240</note> 450</note>
241 451
242<p> 452<p>
243Again, you will want to run <c>env-update</c> to update your system's 453You will have to update your environment by logging out, then in again or
244environment, and you might also want to relogin or resource the
245<path>/etc/profile</path>. 454sourcing <path>/etc/profile</path>.
246</p> 455</p>
247 456
248<p> 457<p>
249For users, <c>java-config --set-user-classpath</c> will create 458For users, <c>java-config --set-user-classpath</c> will create
250<path>~/.gentoo/java-env-classpath</path>, which is automatically included 459<path>~/.gentoo/java-env-classpath</path>, which you should then source from
251by <path>~/.gentoo/java-env</path>. 460your shell's profile.
461</p>
462
463<pre caption="Sourcing user specific classpath">
464<i>if [[ -f "${HOME}/.gentoo/java-env-classpath" ]]; then
465 source ${HOME}/.gentoo/java-env-classpath
466fi</i>
467</pre>
468
252</p> 469<p>
470If you really want a system wide or user default classpath you can add
471something like the following to your shell's profile. But we would advise
472against it.
473</p>
474
475<pre caption="Setting classpath">
476# <i>export CLASSPATH="${CLASSPATH}:$(java-config --classpath log4j,xerces-2)"</i>
477</pre>
478
479</body>
480</section>
481</chapter>
482
483<chapter>
484<title>Java Browser Plugins</title>
485<section>
486<title>Installing a plugin</title>
487<body>
488
489<p>
490You can install a Java plugin for your web browser by emerging a Java VM with
491the <c>nsplugin</c> USE flag set.
492</p>
493
494<note>
495<c>nsplugin</c> is not available for all architectures. Check for available
496plugins on your arch before trying to install a VM by running <c>emerge -pv
497&lt;java-vm&gt;</c>.
498</note>
499
500<p>
501Portage will allow you to install multiple versions of Java plugins, though
502only one will be used by your browser. You can check the list of available
503plugins by running:
504</p>
505
506<pre caption="Viewing available plugins">
507# <i>eselect java-nsplugin list</i>
508 [1] sun-jre-bin-1.6
509 [2] icedtea6-bin
510</pre>
511
512<p>
513In this example, <c>sun-jre-bin</c> is selected for the browser plugin.
514</p>
515
516<pre caption="Selecting a plugin">
517# <i>eselect java-nsplugin set sun-jre-bin-1.6</i>
518</pre>
519
520<p>
521Verify that the correct plugin was selected:
522</p>
523
524<pre caption="Verifying the correct plugin">
525# <i>eselect java-nsplugin list</i>
526 [1] sun-jre-bin-1.6 current
527 [2] icedtea6-bin
528</pre>
529
530<p>
531Java.com also provides a link to <uri
532link="http://java.com/en/download/installed.jsp">verify your installed
533plugin</uri>. Additionally, if you are using a Mozilla-based browser, you can
534verify your Java plugin by typing <c>about:plugins</c> into the address bar.
535</p>
536
537</body>
538</section>
539<section>
540<title>Plugins on multilib systems</title>
541<body>
542
543<p>
544If you are running a mixed 64-bit and 32-bit multilib system (for example, on
545AMD64), you can use 64-bit and 32-bit Java plugins. Unless you have a pressing
546need to run 32-bit Java applications, we recommend using native 64-bit plugins
547on 64-bit web browsers.
548</p>
549
550<p>
551There are several native 64-bit browser plugins available. The default JDK/JRE
552pair, <c>sun-jdk</c> and <c>sun-jre-bin</c>, both include browser plugins. Just
553emerge one of them with the <c>nsplugin</c> USE flag enabled.
554</p>
555
556<pre caption="Installing a 64-bit plugin">
557# <i>echo "dev-java/sun-jre-bin nsplugin" >> /etc/portage/package.use</i>
558# <i>emerge sun-jre-bin</i>
559</pre>
560
561<p>
562To use a 32-bit plugin on a 32-bit browser, you will need to emerge
563<c>emul-linux-x86-java</c> with the <c>nsplugin</c> USE flag enabled.
564</p>
565
566<pre caption="Installing a 32-bit plugin">
567# <i>echo "app-emulation/emul-linux-x86-java nsplugin" >> /etc/portage/package.use</i>
568# <i>emerge emul-linux-x86-java</i>
569</pre>
570
571<p>
572Next, check which plugins are available:
573</p>
574
575<pre caption="Viewing available plugins">
576# <i>eselect java-nsplugin list</i>
577Available 32-bit Java browser plugins
578 [1] emul-linux-x86-java-1.5
579 [2] emul-linux-x86-java-1.6
580Available 64-bit Java browser plugins
581 [1] icedtea6-bin
582 [2] sun-jre-bin-1.6
583</pre>
584
585<p>
586Now select the right plugin for your browsers:
587</p>
588
589<pre caption="Selecting plugins">
590<comment>(Choose the plugins for 32-bit and 64-bit browsers)</comment>
591# <i>eselect java-nsplugin set 32bit emul-linux-x86-java-1.6</i>
592# <i>eselect java-nsplugin set 64bit sun-jre-bin-1.6</i>
593</pre>
594
595<p>
596Verify the correct plugin was selected:
597</p>
598
599<pre caption="Verifying the correct plugin">
600# <i>eselect java-nsplugin list</i>
601Available 32-bit Java browser plugins
602 [1] emul-linux-x86-java-1.5
603 [2] emul-linux-x86-java-1.6 current
604Available 64-bit Java browser plugins
605 [1] icedtea6-bin
606 [2] sun-jre-bin-1.6 current
607</pre>
253 608
254</body> 609</body>
255</section> 610</section>
256</chapter> 611</chapter>
257 612
260<section> 615<section>
261<title>Setting USE flags</title> 616<title>Setting USE flags</title>
262<body> 617<body>
263 618
264<p> 619<p>
265For more information regarding USE flags, refer to the 620For more information regarding USE flags, refer to the <uri
266<uri link="/doc/en/handbook/handbook-x86.xml?part=2&amp;chap=2">USE flags</uri> 621link="/doc/en/handbook/handbook-x86.xml?part=2&amp;chap=2">USE flags</uri>
267chapter from the Gentoo Handbook. 622chapter from the Gentoo Handbook.
268</p> 623</p>
269 624
270</body> 625</body>
271</section> 626</section>
272<section> 627<section>
273<title>The flags</title> 628<title>The flags</title>
274<body> 629<body>
275 630
276<ul> 631<ul>
277<li>The <b>java</b> flag adds support for Java in a variety of programs.</li> 632 <li>The <b>java</b> flag adds support for Java in a variety of programs</li>
633 <li>
278<li>The <b>mozilla</b> flag adds support for Mozilla-like browsers (including Firefox) 634 The <b>nsplugin</b> flag adds support for Mozilla-like browsers (including
279if you are using blackdown's Java kit. You will need this for viewing Java applets 635 Firefox). You will need this for viewing Java applets in your Mozilla-like
280in your Mozilla-like browser.</li> 636 browser.
637 </li>
638 <li>
639 The <b>source</b> flag installs a zip of the source code of a package.
640 This is traditionally used for IDEs to 'attach' source to the libraries you
641 are using.
642 </li>
643 <li>The <b>jce</b> flag adds support for the Java Cryptography Engine</li>
644 <li>
645 For Java packages, the <b>doc</b> flag will build API documentation using
646 javadoc.
647 </li>
281</ul> 648</ul>
282 649
283</body> 650</body>
284</section> 651</section>
285</chapter> 652</chapter>
289<section> 656<section>
290<title>Off-line resources</title> 657<title>Off-line resources</title>
291<body> 658<body>
292 659
293<ul> 660<ul>
294<li>java-config man page</li> 661 <li>java-config man page</li>
295<li><c>java-config --help</c></li> 662 <li><c>java-config --help</c></li>
296<li>The <path>/usr/bin/java-config</path> script itself</li>
297</ul> 663</ul>
298 664
299</body> 665</body>
300</section> 666</section>
301
302<section> 667<section>
303<title>Online resources</title> 668<title>Online resources</title>
304<body> 669<body>
670
305<ul> 671<ul>
672 <li>
673 The <uri link="http://www.gentoo.org/proj/en/java/">Java Project
674 Page</uri>
675 </li>
676 <li>
677 The <uri
678 link="http://news.gmane.org/gmane.linux.gentoo.java">gentoo-java</uri>,
679 <uri
680 link="http://news.gmane.org/gmane.linux.gentoo.user">gentoo-user</uri>, and
681 <uri
306<li>The <uri link="http://news.gmane.org/gmane.linux.gentoo.devel" 682 link="http://news.gmane.org/gmane.linux.gentoo.devel">gentoo-dev</uri>
307>gentoo-dev</uri>, <uri link="http://news.gmane.org/gmane.linux.gentoo.user" 683 mailing list archives
308>gentoo-user </uri> mailing list archives</li> 684 </li>
309<li>#gentoo and #gentoo-java on irc.freenode.net</li> 685 <li>
686 <uri link="irc://irc.gentoo.org/gentoo">#gentoo</uri> and <uri
687 link="irc://irc.gentoo.org/gentoo-java">#gentoo-java</uri> on IRC
688 </li>
689 <li>
690 <uri
310<li><uri link="http://en.wikipedia.org/wiki/Java_programming_language">Wikipedia's entry for Java</uri></li> 691 link="http://en.wikipedia.org/wiki/Java_programming_language">Wikipedia's
692 entry for Java</uri>
693 </li>
694 <li>
695 If you have suggestions or questions regarding this document, please email
696 the Gentoo Java team: <mail>java@gentoo.org</mail>
697 </li>
311</ul> 698</ul>
312 699
313</body> 700</body>
314</section> 701</section>
315</chapter> 702</chapter>

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