117 lines
7.5 KiB
HTML
117 lines
7.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Download and install Java packages" />
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<meta name="abstract" content="To download, install, and use Java packages more effectively on an iSeries server, see the following topics." />
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<meta name="description" content="To download, install, and use Java packages more effectively on an iSeries server, see the following topics." />
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<meta name="DC.Relation" scheme="URI" content="install.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="downinst" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Download and install Java packages</title>
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</head>
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<body id="downinst"><a name="downinst"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Download and install Java packages</h1>
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<div><p>To download, install, and use Java™ packages more effectively on an iSeries™ server,
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see the following topics.</p>
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<p><strong>Packages with graphical user interfaces</strong></p>
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<p>Java programs
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used with graphical user interface (GUI) require the use of a presentation
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device with graphical display capabilities. For example, you can use a personal
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computer, technical workstation, or network computer. You can use Native Abstract
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Windowing Toolkit (NAWT) to provide your Java applications and servlets with the
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full capability of the Java 2 Software Development Kit (J2SDK),
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Standard Edition Abstract Windowing Toolkit (AWT) graphics functions. For
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more information, see <a href="nawt.htm">Native Abstract Windowing Toolkit
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(NAWT)</a>.</p>
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<p><strong>Case sensitivity and integrated file system</strong></p>
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<p>Integrated file system provides file systems, which are both case-sensitive
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and those that are not with regard to file names. QOpenSys is an example of
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a case-sensitive file system within the integrated file system. Root, '/',
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is an example of a case-insensitive file system. For more information, see
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the <a href="../ifs/rzaaxkickoff.htm" target="_blank">Integrated
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file system</a> topic.</p>
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<p> Even though a JAR or class may be located in a case-insensitive file system, Java is
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still a case-sensitive language. While <samp class="codeph">wrklnk '/home/Hello.class'</samp> and <samp class="codeph">wrklnk
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'/home/hello.class'</samp> produce the same results, <samp class="codeph">JAVA CLASS(Hello)</samp> and <samp class="codeph">JAVA
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CLASS(hello)</samp> are calling different classes. </p>
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<p><strong>ZIP file handling and JAR file handling</strong></p>
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<p>ZIP files and JAR files contain a set of Java classes. When you use the <a href="../cl/crtjvapgm.htm" target="_blank">Create Java Program
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(CRTJVAPGM)</a> command on one of these files, the classes are verified,
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converted to an internal machine form, and if specified, transformed to iSeries machine
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code. You can treat ZIP files and JAR files like any other individual class
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file. When an internal machine form is associated with one of these files,
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it remains associated with the file. The internal machine form is used on
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future runs in place of the class file to improve performance. If you are
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unsure whether a current Java program is associated with your class
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file or JAR file, use the <a href="../cl/dspjvapgm.htm" target="_blank"> Display Java Program (DSPJVAPGM)</a> command
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to display information about your Java program on your iSeries server.</p>
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<p>In previous releases of the IBM<sup>®</sup> Developer Kit for Java, you
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had to recreate a Java program if you changed the JAR file or ZIP file
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in any way, because the attached Java program would become unusable. This
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is no longer true. In many cases, if you change a JAR file or ZIP file, the Java program
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is still valid and you do not have to recreate it. If partial changes are
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made, such as when a single class file is updated within a JAR file, you only
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need to recreate the affected class files that are within the JAR file.</p>
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<p>Java programs
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remain attached to the JAR file after most typical changes to the JAR file.
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For example, these Java programs remain attached to the JAR
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file when:</p>
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<ul><li>Changing or recreating a JAR file by using the <a href="javatool.htm">ajar
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tool</a>.</li>
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<li>Changing or recreating a JAR file by using the <a href="javatool.htm">jar
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tool</a>.</li>
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<li>Replacing a JAR file by using the 0S/400 COPY command or the Qshell <samp class="codeph">cp</samp> utility.</li>
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</ul>
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<p>If you access a JAR file in the integrated file system through iSeries Access
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for Windows<sup>®</sup> or
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from a mapped drive on a personal computer (PC), these Java programs
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remain attached to the JAR file when:</p>
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<ul><li>Dragging and dropping another JAR file onto the existing integrated file
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system JAR file.</li>
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<li>Changing or recreating the integrated file system JAR file by using the <a href="javatool.htm">jar tool</a>.</li>
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<li>Replacing the integrated file system JAR file by using the PC copy command.</li>
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</ul>
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<p>When a JAR file is changed or replaced, the Java program that is attached to it is no
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longer current.</p>
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<p>There is one exception in which Java programs do not remain attached to
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the JAR file. The attached Java programs are destroyed if you use file
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transfer protocol (FTP) to replace the JAR file. For example, this occurs
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if you use the FTP <samp class="codeph">put</samp> command to replace the JAR file.</p>
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<p>See <a href="runtperf.htm">Java runtime performance</a> for more
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detailed information about the performance characteristics of JAR files.</p>
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<p><strong>Java extensions
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framework</strong></p>
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<p>In J2SDK, extensions are packages of Java classes that you can use to extend
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the functionality of the core platform. An extension or application is packaged
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in one or more JAR files. The extension mechanism allows the Java virtual
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machine to use the extension classes in the same way that the virtual machine
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uses the system classes. The extension mechanism also provides a way for you
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to retrieve extensions from specified URLs when they are not already installed
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in the J2SDK or Java 2 Runtime Environment, Standard Edition.</p>
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<p>See <a href="instextn.htm">Install extensions for the IBM Developer
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Kit for Java</a> for information on installing extensions.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="install.htm" title="Installing IBM Developer Kit for Java allows you to create and run Java programs on your iSeries server.">Install IBM Developer Kit for Java</a></div>
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</div>
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</div>
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</body>
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</html>
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