IBM AIX Java SDK与Runtime环境差异指南 (v8)

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本指南详细介绍了IBM AIX平台上的IBM SDK和Runtime Environment for Java Technology Edition Version 8的相关特性和区别。它主要关注于IBM对Java技术的实现与Oracle实施之间的差异，旨在帮助用户充分利用该软件环境。这份用户手册涵盖了SDK（Software Developers Kit）和JRE（Java Runtime Environment）的核心组件，以及IBM Java Virtual Machine (JVM)。 SDK部分解释了开发人员工具包，它是用于构建、测试和部署Java应用程序的基础框架，包括编译器、调试器和其他辅助工具。IBM SDK针对AIX平台进行了优化，提供了特定于该操作系统环境的特性，如性能增强、系统集成和兼容性保障。 JRE是运行Java应用程序的关键组件，它负责执行Java字节码。IBM JRE在AIX上提供了稳定的Java运行时环境，确保了跨平台的兼容性和性能。它包括Java核心类库、垃圾回收机制以及用于执行Java应用程序的必要组件。章节一"Betainformation"部分，可能包含了关于产品 Beta 版本的说明，这通常涉及到尚在测试阶段的软件，可能存在不稳定性和未公开的功能，用户在使用前应仔细阅读注意事项，以了解可能的风险和如何处理。版权信息指出，本用户手册适用于IBM SDK和Runtime Environment for AIX, Java Technology Edition Version 8及后续所有版本，包括修正版和Service Refresh。部分内容由Oracle和/或其关联公司于1997年和2013年持有版权，而IBM Corporation在2013年也有相关权益。美国政府用户使用这些信息和产品受限，受GSA ADP Schedule合同约束，仅限IBM Corp提供。章节内容涵盖了广泛的指导，从预览到产品的详细介绍，包括介绍Java语言基础知识、IBM SDK和JRE在AIX环境中的角色，以及如何在实际开发环境中有效地利用这些工具。对于任何想要在IBM AIX平台上进行Java开发和应用运行的用户来说，这份指南是不可或缺的参考资料。

The License file, /usr/swlag/<locale>/Java6_64.la, contains the license

agreement for the SDK for AIX software (where <locale> is the name of your

locale, for example en). To view or print the license agreement, open the file in

a Web browser.

Note: The Annotation Processing Tool (APT) is no longer included with Java

version 8. The tool is superseded by the Pluggable Annotation Processing API

(JSR269). This annotation processing facility has been available since Java version 6.

IBM Java Runtime Environment (JRE)

The JRE provides runtime support for Java applications.

The JRE includes the IBM Java Virtual Machine (JVM), which interprets Java

bytecode at run time. There are a number of tools included with the JRE that are

installed into the /usr/java8[_64]/jre/bin directory, unless otherwise specified.

Contents of the JRE

Core Classes

These classes are the compiled class files for the platform and must remain

compressed for the compiler and interpreter to access them. Do not modify

these classes; instead, create subclasses and override where you need to.

Trusted root certificates

From certificate signing authorities. These certificates are used to validate the

identity of signed material.

JRE Tools

ControlPanel (Java Control Panel)

Configures your Runtime Environment.

ikeycmd (iKeyman command-line utility)

Allows you to manage keys, certificates, and certificate requests from the

command line. For more information see the accompanying Security

documentation.

ikeyman (iKeyman GUI utility)

Allows you to manage keys, certificates, and certificate requests. For more

information see the accompanying Security documentation, which includes

the iKeyman User Guide. There is also a command-line version of this utility.

java (Java Interpreter)

Runs Java classes. The Java Interpreter runs programs that are written in

the Java programming language.

javaw (Java Interpreter)

Runs Java classes in the same way as the java command does, but does

not use a console window.

javaws (Java Web Start)

Enables the deployment and automatic maintenance of Java applications.

For more information, see “Running Web Start” on page 183.

jcontrol (Java Control Panel)

Configures your Runtime Environment.

jextract (Dump extractor)

Converts a system-produced dump into a common format that can be used

by jdmpview. For more information, see “Using jextract” on page 335.

6 IBM SDK for Java: SDK and Runtime Guide

lib_dir

The Java library directory is referred to as lib_dir in this documentation.

The library directory is as follows:

v install_dir/jre/lib/ppc[64]/

Java virtual machine (JVM) version conventions

The JVM version is referred to as <vm_version> in this documentation. To find out

which version of the JVM you are using, enter the following command:

java -version

The following example output shows the JVM version in bold text, in the line

beginning with IBM J9 VM:

java version "1.8.0"

Java(TM) SE Runtime Environment (build pwi3280-20121029_01)

IBM J9 VM (build 2.7, JRE 1.8.0 Windows XP x86-32 20121024_125996 (JIT enabled,

AOT enabled)

J9VM - R27_head_20121023_0935_B125897

JIT - dev_20121009_26996

GC - R27_head_20121022_1139_B125796

J9CL - 20121024_125996)

JCL - 20121015_01 based on Oracle 8-b54

The format of <vm_version> is digits only, so in the previous example,

<vm_version> is 27.

What's new

Learn about the new features and functions available with IBM SDK for AIX, V8.

This topic introduces new material for Version 8.

Any new modifications made to this user guide are indicated by vertical bars to

the left of the changes.

Changes for the initial release are listed in this topic. For changes that relate to

service refreshes, see the relevant subtopic.

Packed object technology preview

Packed object support is available as a technology preview for evaluation

purposes. This enhancement to Java allows greater control over the layout of

objects in memory. The capability enables greater flexibility when dealing with

non-Java memory structures, for example, when exchanging and using data

between Java and other languages or environments. For more information, see

“Packed object evaluation technology” on page 10.

Data access acceleration API

A new API is available for manipulating native data. By using this API, you can

simplify the processing of native data in an application, and take advantage of any

hardware acceleration that is available on your system. For more information, see

“The data access accelerator API” on page 178.

Chapter 2. Product overview 9

Enhancements to the JVM Dump API

The com.ibm.jvm.Dump API is enhanced so that you can specify dump file names

when you trigger dumps at run time. You can also set and query JVM dump

options by using the API. For more information, see the JVM Dump API.

New -Xcheck:dump option

This option runs operating system checks during JVM startup. Messages are issued

if the operating system has dump options or limits set that might truncate system

dumps. For more information, see “JVM command-line options” on page 468

Updates to java core information

The ENVINFO section of a Javadump now contains information about the operating

system hypervisor, if present.

The ENVINFO section contains a new line, 1CIPROCESSID, which shows the ID of the

operating system process that produced the core file.

See “TITLE, GPINFO, and ENVINFO sections” on page 303 for examples.

Default behavior change for method

java.nio.ByteBuffer.allocateDirect(int)

The default behavior of the method java.nio.ByteBuffer.allocateDirect(int) changed

in IBM SDK for Java V7. Direct byte buffers are no longer allocated on a page

boundary. Any applications that rely on the earlier undocumented alignment,

which occurred in Java 6, can revert to the previous behavior with

-XX:+PageAlignDirectMemory. For more information, see “-XX command-line

options” on page 484.

Default changes to class loading

By default, the JVM forces synchronization on a class loader that is not a parallel

capable class loader during class loading. This action occurs even if the loadClass()

method for that classloader is not synchronized. To revert to the earlier behavior in

Java 7, use the -XX:-VMLockClassLoader option, described in “-XX command-line

options” on page 484

Annotation Processing Tool (APT)

This tool is no longer supplied with the IBM SDK for Java. For more information,

see “Migrating from other IBM JVMs” on page 133.

Packed object evaluation technology

Packed object support is a new IBM enhancement for Java that is provided as a

technology preview in IBM SDK for AIX, V8. The content is available subject to a

disclaimer.

Disclaimer

The code and application programming interfaces herein are technology preview

information that may not be made generally available by IBM as or in a product.

You are permitted to use the information only for internal use for evaluation

10 IBM SDK for Java: SDK and Runtime Guide

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