Preface
This book provides information about concepts and procedures for developing Java™ messaging applications (Java clients) that work with Sun Java™ System Message Queue (formerly Sun™ ONE Message Queue).
This preface contains the following sections:
Audience for This Guide
This guide is meant principally for developers of Java applications that exchange messages using a Message Queue messaging system.
These applications use the Java Message Service (JMS) Application Programming Interface (API), and possibly the Java XML Messaging (JAXM) API, to create, send, receive, and read messages. As such, these applications are JMS client and/or JAXM client applications, respectively. The JMS and JAXM specifications are open standards.
This Message Queue Java Client Developer’s Guide assumes that you are familiar with the JMS APIs and with JMS programming guidelines. Its purpose is to help you optimize your JMS client applications by making best use of the features and flexibility of a Message Queue messaging system.
This book assumes no familiarity, however, with the JAXM APIs or with JAXM programming guidelines. This material is described in Chapter 6, "Working With SOAP Messages," and only assumes basic knowledge of XML.
Organization of This Guide
This guide is designed to be read from beginning to end. The following table briefly describes the contents of each chapter:
Conventions
This section provides information about the conventions used in this document.
Text Conventions
Table 2 Document Conventions
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Format
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Description
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italics
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Italicized text represents a placeholder. Substitute an appropriate clause or value where you see italic text. Italicized text is also used to designate a document title, for emphasis, or for a word or phrase being introduced.
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monospace
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Monospace text represents example code, commands that you enter on the command line, directory, file, or path names, error message text, class names, method names (including all elements in the signature), package names, reserved words, and URLs.
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[]
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Square brackets to indicate optional values in a command line syntax statement.
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ALL CAPS
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Text in all capitals represents file system types (GIF, TXT, HTML and so forth), environment variables (IMQ_HOME), or abbreviations (JSP).
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Key+Key
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Simultaneous keystrokes are joined with a plus sign: Ctrl+A means press both keys simultaneously.
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Key-Key
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Consecutive keystrokes are joined with a hyphen: Esc-S means press the Esc key, release it, then press the S key.
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Directory Variable Conventions
Message Queue makes use of three directory variables; how they are set varies from platform to platform. Table 3 describes these variables and summarizes how they are used on the Solaris™, Windows, and Linux platforms.
Table 3 Message Queue Directory Variables
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Variable
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Description
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IMQ_HOME
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This is generally used in Message Queue documentation to refer to the Message Queue base directory (root installation directory):
- On Solaris, there is no root Message Queue installation directory. Therefore, IMQ_HOME is not used in Message Queue documentation to refer to file locations on Solaris.
- On Solaris, for Sun Java™ System Application Server (formerly Sun™ ONE Application Server), the root Message Queue installation directory is /imq, under the Application Server base directory.
- On Windows, the root Message Queue installation directory is set by the Message Queue installer (by default, as C:\Program Files\Sun\MessageQueue3).
- On Windows, for Sun Java System Application Server, the root Message Queue installation directory is /imq, under the Application Server base directory.
- On Linux, there is no root Message Queue installation directory. Therefore, IMQ_HOME is not used in Message Queue documentation to refer to file locations on Linux.
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IMQ_VARHOME
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This is the /var directory in which Message Queue temporary or dynamically-created configuration and data files are stored. It can be set as an environment variable to point to any directory.
- On Solaris, IMQ_VARHOME defaults to the /var/imq directory.
- On Solaris, for Sun Java System Application Server, IMQ_VARHOME defaults to the IMQ_HOME/var directory.
- On Windows IMQ_VARHOME defaults to the IMQ_HOME\var directory.
- On Windows, for Sun Java System Application Server, IMQ_VARHOME defaults to the IMQ_HOME\var directory.
- On Linux, IMQ_VARHOME defaults to the /var/opt/imq directory.
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IMQ_JAVAHOME
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This is an environment variable that points to the location of the Java runtime (JRE) required by Message Queue executables:
- On Solaris, IMQ_JAVAHOME defaults to the /usr/j2se/jre directory, but a user can optionally set the value to wherever the required JRE resides.
- On Windows, IMQ_JAVAHOME defaults to IMQ_HOME\jre, but a user can optionally set the value to wherever the required JRE resides.
- On Linux, Message Queue first looks for the Java runtime in the /usr/java/j2sdkVersion directory, and then looks in the /usr/java/j2reVersion directory, but a user can optionally set the value of IMQ_JAVAHOME to wherever the required JRE resides.
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In this guide, IMQ_HOME, IMQ_VARHOME, and IMQ_JAVAHOME are shown without platform-specific environment variable notation or syntax (for example, $IMQ_HOME on UNIX). Path names generally use UNIX directory separator notation (/).
Other Documentation Resources
In addition to this guide, Message Queue provides additional documentation resources.
The Message Queue Documentation Set
The documents that comprise the Message Queue documentation set are listed in Table 4 in the order in which you would normally use them.
Table 4 Message Queue Documentation Set
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Document
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Audience
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Description
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Message Queue Installation Guide
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Developers and administrators
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Explains how to install Message Queue software on Solaris, Linux, and Windows platforms.
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Message Queue Release Notes
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Developers and administrators
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Includes descriptions of new features, limitations, and known bugs, as well as technical notes.
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Message Queue Java Client Developer’s Guide
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Developers
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Provides a quick-start tutorial and programming information for developers of Java client programs using the Message Queue implementation of the JMS and SOAP/JAXM specifications.
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Message Queue C Client Developer’s Guide
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Developers
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Provides programming and reference documentation for developers of C client programs using the C interface (C-API) to the Message Queue service.
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Message Queue Administration Guide
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Administrators, also recommended for developers
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Provides background and information needed to perform administration tasks using Message Queue administration tools.
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JavaDoc
JMS and Message Queue API documentation in JavaDoc format is provided at the following location:
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Platform
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Location
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Solaris
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/usr/share/javadoc/imq/index.html
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Linux
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/opt/imq/javadoc/index.html/
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Windows
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IMQ_HOME/javadoc/index.html
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This documentation can be viewed in any HTML browser such as Netscape or Internet Explorer. It includes standard JMS API documentation as well as Message Queue-specific APIs for Message Queue administered objects (see Chapter 3, "Using Administered Objects").
Example Client Applications
A number of example applications that provide sample Java client application code are included in the following directories:
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Platform
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Location
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Solaris
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/usr/demo/imq/
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Linux
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/opt/imq/demo/
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Windows
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IMQ_HOME\demo\
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See the README file located in that directory and in each of its subdirectories.
The Java Message Service (JMS) Specification
The JMS specification can be found at the following location:
The specification includes sample client code.
The Java XML Messaging (JAXM) Specification
The JAXM specification can be found at the following location:
The specification includes sample client code.
Books on JMS Programming
For background on using the JMS API, you can consult the following publicly-available books:
- Java Message Service by Richard Monson-Haefel and David A. Chappell, O’Reilly and Associates, Inc., Sebastopol, CA
- Professional JMS by Scott Grant, Michael P. Kovacs, Meeraj Kunnumpurath, Silvano Maffeis, K. Scott Morrison, Gopalan Suresh Raj, Paul Giotta, and James McGovern, Wrox Press Inc., ISBN: 1861004931
- Practical Java Message Service by Tarak Modi, Manning Publications, ISBN: 1930110138
