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Every developer who has deployed a mission critical application knows it is not enough just to write great code; to be truly useful, critical applications must be manageable as well. JMX is a tool with which to instrument and manage software products. It will soon be a standard part of the J2EE specification and is also being accepted by the telephony industry for key specifications. The probability that developers will encounter JMX in one form or another is very high. A copy of this book will dramatically reduce a developer's JMX learning curve, giving them the foundation and technical details needed to make effective use of JMX wherever they find it. Comprehensive coverage includes two chapters of introduction to JMX, seven chapters of practical instrumentation examples and advice, including how to relate security to JMX, and two chapters positioning JMX as a fundamental technology for J2EE and Web services. Readers can use this book as both an introduction to JMX and as a frequent desktop reference.
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Sample Chapter 2
Part I. JMX Introduction.1. Management Concepts.
Progress of Management.
Why Invest in Management?
The Natural Evolution of Management.
Managing the Lifecycle.
Managed Resource Responsibilities.
Event and Automation Applications.
Monitoring and Performance Applications.
Notes.2. Introduction to JMX.
Why We Need JMX.
Choosing a Management Technology.
Dealing with Diversity.
Being Managed by Multiple Management Applications.
Supporting Application-Specific Management Systems.
Which Applications Should Be Manageable?
Applications with Expectant Customers.
The Goals of JMX.
The Specification and Compliance.
The Reference Implementation.
Quick Tour of JMX.
todd, the Time of Day Daemon.
Incorporating an MbeanServer.
Part II. JMX Details.3. All about Mbeans.
The Management Interface.
The Introspection Algorithm.
Summary.4. Model Mbeans.
The Simplest Model MBean Example.
The ModelMBean Interface.
Model MBean Descriptors.
Behavior of the Model Mbean.
Values and Validation.
XML Service: Priming ModelMBeanInfo from XML Files.
Using Model Mbeans.
Creating Static Model Mbeans.
Creating Dynamic Model Mbeans.
Adding Custom Descriptors.
Overriding the RequiredModelMBean Class.
Common Mistakes with Model Mbeans.
XML File Example.
Notes.5. The MbeanServer.
The MBeanServerFactory Class.
Object Name Domains.
Object Name Key Properties.
The ObjectName Class.
The ObjectInstance Class.
The MBeanServer Interface.
MBean Lifecycle Methods.
MBean Access Methods.
The MBeanServerDelegate Mbean.
Query Scope and Pattern Matching.
MBeanServer Query Methods.
Summary.6. Monitors and Monitoring.
The JMX Monitor Service.
The Monitoring Package Structure.
The Monitor Mbean.
Monitoring ApacheÕs Status.
Canonical Usage Pattern.
Summary.7. JMX Agent Services.
The Notification Queue.
The Timer Class.
Dynamic MBean Loading Service.
The MLET Tag.
The MLet API.
A Simple Example: The SessionPool Relation.
The RelationService Class.
Connector Client Proxy.
JMX Security Exposures.
Permission-Based Security Fundamentals.
Using JMX Security.
A Simple Process Management Application (SPMA).
Running with Security Enabled.
Summary.9. Designing with JMX.
MBeanServer Deployment Patterns.
Applications as Mbeans.
MBeans on Behalf of Applications.
Facades for Distributed Applications.
MBean Registration and Lifecycle.
Registration by Application.
Registration by Third Party.
Registration by Management Adapter.
Registration by MBeanServer Bootstrap.
Notifications and Logging.
Part III. Application of JMX.10. J2EE and JMX.
Java 2 Enterprise Edition.
Management Tool Access: The MEJB.
J2EE Management Models.
The Base Managed-Object Model.
The Management Domain Model.
The J2EE Application Server Model.
J2EE Application Component Models.
J2EE Server Runtime Components.
Standard Management Functions.
Stats Interface Details.
Areas Missing from J2EE Management.
Sample JSR 77 Code.
Notes.11. Web Services and JMX.
Web Services Overview.
Web Service Stack.
Web Service Registry Management.
Web Service Execution Environment Management.
Execution Environment Owner.
Execution Environment User.
Web Service Management.
Web Service Owner.
Web Service User.
StockQuote Service WSDL Document.
Notes.Appendix. JMX in Products.
JMX Agent Implementations.
JMX 1.0 Reference Implementation from Sun Microsystems.
JDMK 4.2 from Sun Microsystems.
TMX4J 1.0 from Tivoli Systems.
AdventNet Agent Toolkit Java/JMX Edition.
Tivoli Web Component Manager.
AdventNet Middleware Manager.
AdventNet Web NMS.
Vigor Soft hawkEye.
IBM WebSphere 5.0.
IBM Web Services Tool Kit 3.1.
IBM WebSphere Voice Server.
IBM WebSphere Business Components Composer.
BEA Systems WebLogic Server 7.0.
IONA Technologies PLC: Orbix E2A XML Bus Edition 5.3.
Hewlett-Packard Core Services Framework.
Sonic Software SonicXQ.
Pramati Server from Pramati Technologies.
Sybase EAServer 4.0.
Sun Microsystems: Sun ONE Application Server.
Sun Microsystems: Sun ONE Portal Server.
Compiere Open Source ERP & CRM.
Welcome! You have just opened your key to the secret art of management. This book is your comprehensive guide to the development of manageable application software using the Java Management Extensions (JMX). Now that Java has made the leap from cool to critical, every developer who has deployed a mission critical application knows it is not enough just to write great code; to be truly useful, critical applications must be manageable as well. With the publishing of the JMX specification and the availability of multiple JMX implementations, Java programmers have a standard mechanism with which to instrument and manage their software products. This book will provide you with the information necessary to leverage JMX to create a new generation of better instrumented, more manageable, and therefore more reliable mission critical Java applications.
At the moment the two biggest growth areas for Java are enterprise and embedded systems. Tens of thousands of IT developers are now or soon will be using J2EE technologies to create mission-critical business systems. The major J2EE vendors, including IBM WebSphere and BEA WebLogic application servers, are using JMX to provide their own management as well as enable yours. The J2EE 1.4 standard is being extended to include management interfaces using JMX as defined by JSR077. At the other end of the spectrum, thousands more developers will be using Java to create embedded applications from set top boxes to remote pumping station monitors. It is essential that these applications, which run unattended on "invisible computers" for the most part, be as self-monitoring and self-managing as possible. JMX provides a substrate upon which to construct such self-monitoring/managing applications, and a copy of this book will substantially reduce your JMX learning curve. JMX is also being accepted by the telephony industry as a management infrastructure for Java API for Intelligent networks (JAIN). As these specifications for the use of Java in telephony service environments emerge, whole new industries will need to become familiar with JMX. The probability that you will encounter JMX in one form or another, as part of your own designs or as the instrumentation mechanism for components of your infrastructure, is very high. This book will give you the foundation and technical details you need to make effective use of JMX wherever you find it.
While it is well known that JMX is continuing to evolve, its basic architecture and interfaces will remain consistent. There is more to using JMX then understanding the architecture and interfaces, you also need to understand how to connect it to management systems, the role it plays in the management industry, appropriate use of the technology, as well as management design patterns. You need to understand how to create a manageable system. This book has been written in a comprehensive manner by experts in that space. This book also gives you an in depth understanding of the application of JMX in hot technologies: J2EE and Web services. You will find this book to be useful long after new versions of JMX become available, because the concepts introduced in this book are classic applications of management concepts and technologies to the Java family. This book will do more than help you write MBeans; it will help guide you in building manageable systems.
Our primary goal in writing this book is to explain Java based management, manageability, i.e., enabling resources to be managed, and JMX in detail, and make it easy to understand.
Architects and developers involved in the design and implementation of mission-critical Java applications are the primary audience for this book. They understand that their biggest challenges come well after the first successful installation of a new piece of software when their client's business becomes critically dependent on that software. Then it is essential that administrators be able to monitor and manage the application day and night in order to keep the business in business. Until recently each Java-based product had to develop its own ad hoc management solution. That changed with the publishing of the "Java Management Extensions Instrumentation and Agent Specification, v1.0."
This book has been written especially for Java developers who find themselves in a situation where they must enable their application to be managed by an "outside" management system.
Other Java developers and architects who will find this book useful include:
This book assumes that you do not have a background in systems or applications management, and provides a comprehensive overview of the history of the management industry and the forces that combined to make JMX the ubiquitous management technology for Java resources across the Java community. Java resources deployed in the micro, standard, and enterprise editions of the JDK can all use JMX.The authors have extensive first hand experience with JMX from nearly every angle. Heather was an original member of the JMX expert group and personally contributed the specification, Reference Implementation (RI), and Test Compatibility Kit (TCK) for ModelMBeans. She is now involved in Web services and applying management to this emerging space. Ward is the lead architect for Tivoli's implementation of JMX, TMX4J, as well as Tivoli's Web Component Manager product, which uses JMX to manage resources. Leigh was a member of JSR077 J2EE Management and the architect for WebSphere's JMX support and JSR077 support. This book represents our experience with JMX from all these projects; we bring you a unique insider perspective on the intent, implementation, application, and even pitfalls of JMX. All of this JMX experience is in the context of our extensive experience in all aspects of management systems and middleware.
This book will be valuable for developers of applications that should be managed, developers of middleware, and developers of management systems. We hope that you will find this book useful not only as an introduction to JMX, but also as a frequent desktop reference as you connect your application to an existing management system or start to develop your own management application.
This book assumes that you are familiar with developing applications using Java. We do not assume that you have experience with management systems. As such, the first chapter introduces management concepts, disciplines, and architectures. If you are familiar with management systems, then you may skip this chapter and start with Chapter 2, "Introduction to JMX."
Chapter 10, "J2EE and JMX," explains JSR077 "J2EE Management" in depth, as well as how it relates to JMX. This chapter assumes that you have a high-level understanding of the components of the J2EE specification and its realization in J2EE application servers.Chapter 11, "Web services and JMX," explains how JMX can be used to develop manageable Web service applications. It will be helpful to have a general understanding of what a Web services is, and familiarity with common Web service architectures.
This book will provide you with the necessary information, insight, and examples to use JMX to build manageable mission-critical applications or provide a standard management interface to homegrown and third-party management applications.
It is sometimes as important to understand the context of Java technologies as it is to understand the technology itself. This is the case with JMX. Therefore, this book gives you almost two chapters detailing the history of management systems, management architectures, applications, and technologies. In these chapters we also explain the forces that combined to make JMX so important for the Java community. This book gives you the background you need to understand and enter conversations in the management industry.
Specifically, you will learn to develop standard and dynamic MBeans to represent JMX manageable resources in their applications. You will understand how and when to leverage the Model MBean to rapidly develop extensible instrumentation and how to represent interdependent management components using the JMX Relation Service. Because instrumentation inevitably requires monitoring, this book discusses the use of JMX's various monitors and its notification model in detail. In addition, this book provides working example code to illustrate the application of JMX technology in a number of settings, including J2EE and Web services.
At a minimum, you will need to have a J2SE JDK and a JMX implementation installed on your computer to compile and run the samples shown throughout this book. These samples have been tested with the TMX4J and MX4J implementations. TMX4J is 100% Java code and should run on any platform, but it has been tested on a Windows operating system. The TMX4J can be downloaded for free from the IBM AlphaWorks Web site at http://www.alphaworks.ibm.com.
The examples in chapter 10 demonstrate solutions based on J2EE application server products such as WebSphere Application Server. A list of J2EE servers that support this is listed in appendix A. Complete product information for WebSphere Application Server may be found on the Web at http://www.ibm.com/products/websphere.
In order to run the examples in Chapter 11, you will need a Web services runtime including a web server, servlet engine, soap engine, and JMX implementation. The samples in this chapter were tested with the IBM Web Services Toolkit which is available for free from the IBM AlphaWorks web site at http://www.alphaworks.ibm.com.
We have arranged the content of this book into three broad sections. The first section introduces you to management and JMX. The next section gives you a detailed and comprehensive coverage of the JMX architecture, APIs, programming techniques, and pitfalls. We even supply you an entire chapter on design and implementation suggestions, along with our favorite pitfalls. The final section lays out the application of JMX in two fast-growing fields: J2EE and Web services. We recognize that each reader will be interested in different portions of the book and not everyone will need to read every chapter. For those already familiar with management systems, you may skip Chapter 1, "Management Concepts," which introduces management concepts, disciplines, and architectures. We encourage everyone to at least read Chapter 2, "Introduction to JMX." You should feel free to read those chapters that most interest you or are most immediate to your needs. If you have a general understanding of JMX, then the rest of the chapters of the book can stand alone, so it is not necessary to read the book straight through.
The following is a quick summary of the contents of each of the three sections of the book and their chapters:
The associated code files described in this book are available on Addison-Wesley's Web site at http://www.awprofessional.com/. Enter this book's ISBN (without the hyphens) in the Search box and click Search. When the book's title is displayed, click the title to go to a page where you can download the code.
The following typographic conventions are used in this book:
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