81 lines
5.6 KiB
HTML
81 lines
5.6 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="Limitations" />
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<meta name="abstract" content="This list identifies any known limitations, restrictions, or unique behaviors in the IBM Developer Kit for Java." />
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<meta name="description" content="This list identifies any known limitations, restrictions, or unique behaviors in the IBM Developer Kit for Java." />
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<meta name="DC.Relation" scheme="URI" content="trouble.htm" />
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<meta name="DC.Relation" scheme="URI" content="findjob.htm" />
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<meta name="DC.Relation" scheme="URI" content="collect.htm" />
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<meta name="DC.Relation" scheme="URI" content="applyptfs.htm" />
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<meta name="DC.Relation" scheme="URI" content="getsup.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="limits" />
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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>Limitations</title>
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</head>
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<body id="limits"><a name="limits"><!-- --></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">Limitations</h1>
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<div><p>This list identifies any known limitations, restrictions, or unique
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behaviors in the IBM<sup>®</sup> Developer Kit for Java™.</p>
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<ul><li>When a class is loaded and its superclasses are not found, the error indicates
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that the original class was not found. For example, if class B extends class
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A, and class A is not found when loading class B, the error indicates that
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class B was not found, even though it is actually class A that was not found.
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When you see an error that indicates that a class was not found, check to
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make sure that the class and all of its superclasses are in the CLASSPATH.
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This also applies to interfaces that are implemented by the class being loaded.</li>
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<li>The garbage collection heap is limited to 240 GB.</li>
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<li>There is no explicit limit to the number of constructed objects.</li>
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<li>The java.net backlog parameter on an iSeries™ server may behave differently
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than on other platforms. For example: <ul><li>Listen backlogs 0, 1 <ul><li>Listen(0) means to allow one pending connection; it does not disable a
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socket.</li>
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<li>Listen(1) means to allow one pending comment, and means the same as Listen(0).</li>
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</ul>
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</li>
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<li>Listen backlogs > 1 <ul><li>This allows many pending requests to remain on the listen queue. If a
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new connection request arrives and the queue is at the limit, then it deletes
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one of the pending requests.</li>
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</ul>
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</li>
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</ul>
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</li>
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<li> You can only use the Java virtual machine, regardless of the
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JDK version you are using, in multi-thread capable (that is, thread-safe)
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environments. The iSeries server is thread-safe, but some file systems
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are not. For a list of nonthread-safe file systems, see <a href="../ifs/rzaaxkickoff.htm" target="_blank">Integrated File System</a>.</li>
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<li>Internet Protocol version 6 (IPv6) support is not fully implemented and
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some side effects may occur. For more information, see <a href="../rzab6/rzab6ip6scen.htm" target="_blank">Sockets</a>.</li>
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</ul>
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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="trouble.htm" title="This topic shows you how to find job logs and collect data for Java program analysis. This topic also provides information about program temporary fixes (PTFs) and getting support for IBM Developer Kit for Java.">Troubleshoot IBM Developer Kit for Java</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="applyptfs.htm" title="Beginning in i5/OS V5R4, you can use the Display Java Virtual Machine Jobs (DSPJVMJOB) CL command to manage your JVM jobs and apply PTFs while the system is active.">Apply program temporary fixes</a></div>
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<div><a href="getsup.htm" title="Support services for the IBM Developer Kit for Java are provided under the usual terms and conditions for iSeries software products. Support services include program services, voice support, and consulting services.">Get support for the IBM Developer Kit for Java</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="findjob.htm" title="Use the job log from the job that ran the Java command, and the batch immediate (BCI) job log where the Java program ran, to analyze causes of a Java failure. They both may contain important error information.">Find job logs for Java problem analysis</a></div>
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<div><a href="collect.htm" title="To collect data for an authorized program analysis report (APAR), follow these steps.">Collect data for Java problem analysis</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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