278 lines
8.1 KiB
HTML
278 lines
8.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
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<title>Debian Java FAQ. - Java Virtual Machines (JVM)</title>
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<link href="index.html" rel="start">
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<link href="ch5.html" rel="prev">
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<link href="ch-browser-java.html" rel="next">
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<link href="index.html#contents" rel="contents">
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<link href="index.html#copyright" rel="copyright">
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<link href="ch1.html" rel="chapter" title="1 Introduction">
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<link href="ch-debian-java-lenny.html" rel="chapter" title="2 Status of Java in Debian GNU/Linux 5.0 (Lenny)">
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<link href="ch-debian-java-squeeze.html" rel="chapter" title="3 Status of Java in Debian Squeeze">
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<link href="ch4.html" rel="chapter" title="4 Java Development">
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<link href="ch5.html" rel="chapter" title="5 Managing Java (for users and administrators)">
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<link href="ch6.html" rel="chapter" title="6 Java Virtual Machines (JVM)">
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<link href="ch-browser-java.html" rel="chapter" title="7 Java Plugins for Browsers">
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<link href="ch8.html" rel="chapter" title="8 Java Servlets">
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<link href="ch9.html" rel="chapter" title="9 Java Policy">
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<link href="ch10.html" rel="chapter" title="10 Other Java alternatives for Debian">
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<link href="ch1.html#s1.1" rel="section" title="1.1 Introduction to this FAQ">
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<link href="ch1.html#s1.2" rel="section" title="1.2 Location of this FAQ">
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<link href="ch1.html#s-bugs" rel="section" title="1.3 Sending bugs on this FAQ">
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<link href="ch1.html#s1.4" rel="section" title="1.4 What is Java?">
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<link href="ch1.html#s1.5" rel="section" title="1.5 Where can I ask questions about Java on Debian?">
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<link href="ch1.html#s-moreinfo" rel="section" title="1.6 Complementary information">
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<link href="ch1.html#s-pending" rel="section" title="1.7 Uncovered issues">
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<link href="ch-debian-java-lenny.html#s2.1" rel="section" title="2.1 What is new in Lenny?">
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<link href="ch-debian-java-squeeze.html#s3.1" rel="section" title="3.1 What is new in Squeeze?">
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<link href="ch-debian-java-squeeze.html#s3.2" rel="section" title="3.2 What are the most important changes in the Java policy?">
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<link href="ch-debian-java-squeeze.html#s3.3" rel="section" title="3.3 What have been removed in Squeeze?">
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<link href="ch4.html#s4.1" rel="section" title="4.1 What full-fledged Java development platforms are available in Debian?">
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<link href="ch4.html#s-free" rel="section" title="4.2 What free platforms are there and how can I contribute?">
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<link href="ch4.html#s-license-concerns" rel="section" title="4.3 Questions on platforms and license concerns">
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<link href="ch4.html#s4.4" rel="section" title="4.4 Making Debian packages for Java programs.">
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<link href="ch6.html#s6.1" rel="section" title="6.1 What JVMs are available in Debian?">
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<link href="ch6.html#s6.2" rel="section" title="6.2 What Java Compilers are available in Debian?">
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<link href="ch6.html#s6.3" rel="section" title="6.3 What API do these JVMs provide?">
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<link href="ch6.html#s6.4" rel="section" title="6.4 Are there known problems?">
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<link href="ch6.html#s6.5" rel="section" title="6.5 Do I need a JVM to run a Java program in Debian?">
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<link href="ch8.html#s8.1" rel="section" title="8.1 How can I make Java servlets work?">
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<link href="ch9.html#s9.1" rel="section" title="9.1 Is there a Java policy for Debian?">
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<link href="ch9.html#s9.2" rel="section" title="9.2 Are there holes in the Java Policy?">
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<link href="ch10.html#s10.1" rel="section" title="10.1 Java programs not yet available on Debian">
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<link href="ch4.html#s-java56" rel="subsection" title="4.3.1 Java 5 and 6">
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<link href="ch4.html#s-openjdk" rel="subsection" title="4.3.2 Sun's OpenJDK">
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<link href="ch4.html#s4.4.1" rel="subsection" title="4.4.1 Can the package go into main?">
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<link href="ch4.html#s4.4.2" rel="subsection" title="4.4.2 Is there a good example Debian package?">
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<link href="ch4.html#s4.4.3" rel="subsection" title="4.4.3 What tools are available to make maintaining a Java packages easier?">
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<link href="ch4.html#s4.4.4" rel="subsection" title="4.4.4 Linking package Javadoc to system javadoc.">
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<link href="ch6.html#s6.5.1" rel="subsection" title="6.5.1 How do I compile to native code?">
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</head>
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<body>
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<p><a name="ch6"></a></p>
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<hr>
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<p>
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[ <a href="ch5.html">previous</a> ]
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[ <a href="index.html#contents">Contents</a> ]
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[ <a href="ch1.html">1</a> ]
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[ <a href="ch-debian-java-lenny.html">2</a> ]
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[ <a href="ch-debian-java-squeeze.html">3</a> ]
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[ <a href="ch4.html">4</a> ]
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[ <a href="ch5.html">5</a> ]
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[ 6 ]
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[ <a href="ch-browser-java.html">7</a> ]
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[ <a href="ch8.html">8</a> ]
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[ <a href="ch9.html">9</a> ]
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[ <a href="ch10.html">10</a> ]
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[ <a href="ch-browser-java.html">next</a> ]
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</p>
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<hr>
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<h1>
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Debian Java FAQ.
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<br>Chapter 6 - Java Virtual Machines (JVM)
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</h1>
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<hr>
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<hr>
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<h2><a name="s6.1"></a>6.1 What JVMs are available in Debian?</h2>
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<p>
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The following JVMs are currently available in Debian Squeeze:
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</p>
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<ul>
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<li>
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<p>
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<code>openjdk-6-jre</code>
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code>sun-java6-jre</code> (non-free)
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code>gcj-4.4-jre</code>
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</p>
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</li>
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</ul>
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<p>
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The following lists JVMs available in Debian 5.0 release ('Lenny'):
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</p>
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<ul>
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<li>
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<p>
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<code>openjdk-6-jre</code>
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code>kaffe</code>
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code>gij-4.3</code>
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</p>
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</li>
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</ul>
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<hr>
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<h2><a name="s6.2"></a>6.2 What Java Compilers are available in Debian?</h2>
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<ul>
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<li>
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<p>
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<code>openjdk-6-jdk</code>
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code>sun-java6-jdk</code> (non-free)
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code>gcj</code>. Compiles Java source to native code, also source to
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bytecode, or bytecode to native code.
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</p>
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</li>
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</ul>
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<hr>
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<h2><a name="s6.3"></a>6.3 What API do these JVMs provide?</h2>
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<p>
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Note that providing an API does not mean that everything is implemented, and
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certainly not implemented correctly. But even Sun's SDK, each out of four
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confirmed bugs don't get fixed, so don't disregard free implementation on
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buggyness or limited implementation alone.
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</p>
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<hr>
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<h2><a name="s6.4"></a>6.4 Are there known problems?</h2>
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<p>
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Yes, there are. Some of these are reported as Debian bugs. You can look up
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the bugs for a specific Debian package at the <code><a
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href="http://www.debian.org/Bugs/">Debian Bug Tracking System</a></code>. As a
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quick link, here are some packages:
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</p>
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<ul>
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<li>
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<p>
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<code><a href="http://bugs.debian.org/java-common">java-common</a></code>
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code><a href="http://bugs.debian.org/src:openjdk-6">openjdk-6</a></code>
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</p>
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</li>
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</ul>
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<ul>
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<li>
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<p>
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<code><a href="http://bugs.debian.org/src:gcj-4.4">gcj-4.4</a></code>
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</p>
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</li>
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</ul>
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<p>
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As common within the Debian project, the developers would appreciate good bug
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reports on found problems. These include the good description of the problem,
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the command that gives the problem, the errors given when running the command,
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and any other information that might be relevant. A good tool to report bugs
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is <code>reportbug</code>.
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</p>
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<hr>
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<h2><a name="s6.5"></a>6.5 Do I need a JVM to run a Java program in Debian?</h2>
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<p>
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No, you can try to run the applications without a jvm by compiling the source
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code to native code is.
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</p>
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<hr>
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<h3><a name="s6.5.1"></a>6.5.1 How do I compile to native code?</h3>
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<p>
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You might be able to use <code>gcj</code> to compile the program. And use
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<code>gcj</code> to convert bytecode to native code. The entire software chain
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is free.
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</p>
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<hr>
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<p>
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[ <a href="ch5.html">previous</a> ]
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[ <a href="index.html#contents">Contents</a> ]
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[ <a href="ch1.html">1</a> ]
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[ <a href="ch-debian-java-lenny.html">2</a> ]
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[ <a href="ch-debian-java-squeeze.html">3</a> ]
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[ <a href="ch4.html">4</a> ]
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[ <a href="ch5.html">5</a> ]
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[ 6 ]
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[ <a href="ch-browser-java.html">7</a> ]
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[ <a href="ch8.html">8</a> ]
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[ <a href="ch9.html">9</a> ]
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[ <a href="ch10.html">10</a> ]
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[ <a href="ch-browser-java.html">next</a> ]
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</p>
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<hr>
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<p>
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Debian Java FAQ.
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</p>
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<address>
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$Revision: 7831 $, $Date: 2010-12-04 20:17:15 +0000 (Sat, 04 Dec 2010) $<br>
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<br>
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Torsten Werner <code><a href="mailto:twerner@debian.org">twerner@debian.org</a></code><br>
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Niels Thykier <code><a href="mailto:niels@thykier.net">niels@thykier.net</a></code><br>
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Javier Fern<72>ndez-Sanguino Pe<50>a <code><a href="mailto:jfs@debian.org">jfs@debian.org</a></code><br>
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<br>
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</address>
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<hr>
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</body>
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</html>
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