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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 1.44 2009/10/07 18:14:31 nightmorph Exp $ --> 2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/java.xml,v 1.47 2009/12/23 08:41:21 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>
6<title>Gentoo Java Guide</title> 6<title>Gentoo Java Guide</title>
7 7
8<author title="Author"> 8<author title="Author">
9 <mail link="nichoj@gentoo.org">Joshua Nichols</mail> 9 <mail link="nichoj@gentoo.org">Joshua Nichols</mail>
10</author> 10</author>
22 22
23<!-- The content of this document is licensed under the CC-BY-SA license --> 23<!-- The content of this document is licensed under the CC-BY-SA license -->
24<!-- See http://creativecommons.org/licenses/by-sa/2.5 --> 24<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
25<license/> 25<license/>
26 26
27<version>0.19</version> 27<version>0.22</version>
28<date>2009-10-07</date> 28<date>2009-12-23</date>
29 29
30<chapter> 30<chapter>
31<title>What is Java?</title> 31<title>What is Java?</title>
32<section> 32<section>
33<title>Overview</title> 33<title>Overview</title>
98 <th>Vendor</th> 98 <th>Vendor</th>
99 <th>JDK</th> 99 <th>JDK</th>
100 <th>JRE</th> 100 <th>JRE</th>
101</tr> 101</tr>
102<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> 103 <ti>Sun's Java Kit</ti>
109 <ti>dev-java/sun-jdk</ti> 104 <ti>dev-java/sun-jdk</ti>
110 <ti>dev-java/sun-jre-bin</ti> 105 <ti>dev-java/sun-jre-bin</ti>
111</tr> 106</tr>
112<tr> 107<tr>
123<!-- 118<!--
124TODO: list free implementations? 119TODO: list free implementations?
125note about not drop-in replacements 120note about not drop-in replacements
126kaffe/sablevm/gcj/jamvm 121kaffe/sablevm/gcj/jamvm
127--> 122-->
128<p>
129The default for Java 1.6 is the Sun JRE/JDK pair.
130</p>
131
132</body> 123</body>
133</section> 124</section>
134<section> 125<section>
135<title>Installing a JRE/JDKs</title> 126<title>Installing a JRE/JDKs</title>
136<body> 127<body>
208</p> 199</p>
209 200
210<pre caption="Listing available VMs"> 201<pre caption="Listing available VMs">
211# <i>java-config --list-available-vms</i> 202# <i>java-config --list-available-vms</i>
212The following VMs are available for generation-2: 203The following VMs are available for generation-2:
2131) Blackdown JDK 1.4.2.03 [blackdown-jdk-1.4.2] <comment>(Build Only)</comment>
2142) Blackdown JRE 1.4.2.03 [blackdown-jre-1.4.2] <comment>(Build Only)</comment>
2153) IcedTea6-bin 1.4.1 [icedtea6-bin] 2041) IcedTea6-bin 1.4.1 [icedtea6-bin]
2164) Sun JDK 1.5.0.20 [sun-jdk-1.5] <comment>(Build Only)</comment> 2052) Sun JDK 1.5.0.20 [sun-jdk-1.5] <comment>(Build Only)</comment>
217*) Sun JDK 1.6.0.16 [sun-jdk-1.6] 206*) Sun JDK 1.6.0.16 [sun-jdk-1.6]
218</pre> 207</pre>
219 208
220<note> 209<note>
221VMs marked as Build Only may contain security vulnerabilities and/or be EOL. 210VMs marked as Build Only may contain security vulnerabilities and/or be EOL.
231--set-system-vm</c>. Here is an example of how to set the system VM. 220--set-system-vm</c>. Here is an example of how to set the system VM.
232</p> 221</p>
233 222
234<pre caption="Setting the System VM"> 223<pre caption="Setting the System VM">
235<comment>(By handle (preferred))</comment> 224<comment>(By handle (preferred))</comment>
236# <i>java-config --set-system-vm blackdown-jdk-1.4</i> 225# <i>java-config --set-system-vm sun-jdk-1.6</i>
237Now using blackdown-jdk-1.4 as your generation-2 system JVM 226Now using sun-jdk-1.6 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> 227<comment>(By number)</comment>
240# <i>java-config --set-system-vm 5</i> 228# <i>java-config --set-system-vm 3</i>
241Now using sun-jdk-1.6 as your generation-2 system JVM 229Now using sun-jdk-1.6 as your generation-2 system JVM
242</pre> 230</pre>
243 231
244<p> 232<p>
245As a regular user, you can use <c>java-config --set-user-vm</c>. 233As a regular user, you can use <c>java-config --set-user-vm</c>.
310*=sun-jdk-1.5 298*=sun-jdk-1.5
311</pre> 299</pre>
312 300
313<pre caption="Example /etc/java-config-2/build/jdk.conf"> 301<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, 302<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> 303# For 1.5, use sun-jdk </comment>
3161.3=sun-jdk-1.4 ibm-jdk-bin 3041.3=sun-jdk-1.4 ibm-jdk-bin
3171.4=blackdown-jdk
3181.5=sun-jdk 3051.5=sun-jdk
319</pre> 306</pre>
320 307
321<warn> 308<warn>
322You do not have to edit this file. If you change these options to use a 309You do not <e>have</e> to edit this file. If you change these options to use a
323unsupported VM, things could possibly break. Bugs reported with a unsupported 310unsupported VM, things could possibly break. Bugs reported with a unsupported VM
324VM won't be prioritized as much as bugs present within supported VMs. 311won't be prioritized as much as bugs present within supported VMs.
325</warn> 312</warn>
326 313
327</body> 314</body>
328</section> 315</section>
329</chapter> 316</chapter>
344<pre caption="/etc/java-config-2/build/compilers.conf"> 331<pre caption="/etc/java-config-2/build/compilers.conf">
345# If the ebuild supports it 332# If the ebuild supports it
346# it will check the COMPILERS var front to back and 333# it will check the COMPILERS var front to back and
347# use the first compiler that is installed 334# use the first compiler that is installed
348 335
349COMPILERS="ecj-3.1 jikes javac" 336COMPILERS="ecj-X.Y jikes javac"
350</pre> 337</pre>
351 338
352<p> 339<p>
353Some compilers don't support all possible -target and -source arguments. 340Some 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 341Therefore, each compiler in the list is checked to see if it can support the
386 1.5 syntax yet. 373 1.5 syntax yet.
387 </ti> 374 </ti>
388</tr> 375</tr>
389<tr> 376<tr>
390 <ti>Eclipse Compiler for Java</ti> 377 <ti>Eclipse Compiler for Java</ti>
391 <ti>ecj-3.1</ti> 378 <ti>ecj</ti>
392 <ti>=dev-java/eclipse-ecj-3.1*</ti> 379 <ti>dev-java/eclipse-ecj</ti>
393 <ti> 380 <ti>
394 ECJ is the compiler used by the Eclipse software development kit. It is 381 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. 382 very full featured, and is pretty fast. It does support Java 1.5 syntax.
396 </ti> 383 </ti>
397</tr> 384</tr>

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