JMX

In order for an MBean to be exposed to a JMX client, it must be registered with an MBean server running inside of a JMX agent.

As you work more with JMX, however, you could notice a number of idiosyncrasies when using implicit MBean construction.

Now that your JMX infrastructure is ready to run, you finally have to create a view to see the data in your managed applications.

JMX-manageable resources at this level can be designed completely independently of objects at any other JMX architectural levels.

It would be very nice to roll-up key information about nested monitors in the JMX statistics.

While Spring JMX offers numerous options, the default exporter is enough for many projects, allowing you to get up-and-running very quickly.

JMX specifies a protocol used to communicate between the MBeanServer and the JMX client, which can run over a variety of transports.

In remote deployment, the collector runs in a separate process and connects to the target JVM using some form of JMX Remoting.

Other key-value pairs can be specified as well, and the JMX API includes facilities for wildcard matching of object names.

Standard JMX clients like Sun Microsystems's JConsole will also be able to show the information.

Now that you can see log4j through JMX, the next step is to adjust some of the logging settings.

JMX and custom MBeans make it possible to support powerful remote customized administration of your applications.

It might be called from a JMX listener, an action listener in the GUI event thread, through RMI, through a Web service, and so on.

We'll begin our exploration of JMX by looking at the history of network management software and how it has evolved.

This server enables the client to access JMX notifications generated by the application servers, node agents, and ODRs within the cell.

You used them to confirm that you were, indeed, connected to the remote JMX agent.

The article includes a sample program so you can begin experimenting with a JMX client configuration administrator program.

The progress and result of the update operation is conveyed via JMX events.

I've demonstrated techniques for monitoring the health of a JVM and general performance data acquisition through JMX.

Now that you know how to configure JMX through resources. xml, it's time to add a new twist.

JMX provides introspection on the JVM, the application server, and your classes all through a consistent interface.

In part two, I'll revisit this topic to show how I update the JMX support to display nested statistics like this.

The process is similar to what you've have already seen, thanks to JMX's abstraction layer.

Figure 1 shows the jconsole JMX client (part of the JDK) displaying one of the memory management views -- heap usage over time.

Rudimentary code is provided to allow the touchpoint to modify the attributes of one of the JMX entities.

Each of the test plans is saved in XML format in a file with a . jmx suffix.

It is necessary to add a JMX event listener to the AppManagement MBean to understand the completion of update operation.

This tutorial is written for programmers with a reasonable knowledge of Java programming, Eclipse, JMX, and systems management.

Traditionally, supporting JMX involves implementing patterns with boilerplate code.

In the case of ClickMeter, we used the simple agent from the JMX reference implementation, which included an HTTP protocol adapter.

Endpoints that are manageable through these objects are called JMX-manageable resources in the specification.

Figure 2 shows an example of a custom administrative client feeding notification information from the JMX APIs to a monitoring tool.

So far, I've examined monitoring only standard JVM resources through JMX.

To achieve this, I'll implement my own assembler and extend the base Spring JMX exporter.

This notification is sent out via JMX, is displayed in the administrative console, and is recorded in the server logs.

Users can also write their own PMI applications using programmatic interfaces like the PMI client API and the JMX API.

Distributed Services Level: In this level, the aim is to specify the interfaces that provide for JMX Manager components.

An open source JMX management console that works with a variety of servers.

The archive in the download file contains the sample JMeter test plan (PortalAnalyticsExample. jmx), as shown in Figure 4.

The ability to expose performance statistics as JMX attributes, and to send notifications when statistics exceed specified thresholds.

Note that the corresponding MBean is the JMX-internal representation of the device or service.

If they are not in the same domain, then JMX callbacks are used to obtain the subject.

The previous tutorials include additional Java or JMX code available for download at the indicated locations.

Check whether system monitoring and management services are implemented with open standards and APIs like JMX, open SNMP APIs.

For the remainder of the article, I ll focus on demonstrating the use of my Spring JMX extensions.

To set up your JMX agent to accept remote connections, you need to pass a few more JMX-related flags to the JVM.

For the JMX example, you use the second hook and register the ApplicationManagement-jmx-context. xml file shown in Listing 6.

It is the custom agent logic that may provide localized intelligence to manage the JMX-manageable resources registered with this agent.

A standard approach is to use JMX, which provides a standard API to manage your application settings.

Sun Microsystems provides reference implementations of JMX and JMX Remote under a free license.

In this case, I used Spring's container-based architecture and AOP framework to add notification events to JMX methods and attributes.

This design can support completely JMX-free unmanaged operations, where components interact purely through the kernel.

A developer can instrument an application using JMX to provide contextual information for issues that occur.

In this case, I'll combine JMX with AspectJ, which enables me to write the management logic separately.

Many other extensions are possible, and both Spring and JMX are vast subjects, each worthy of further investigation.

You can use SSL to encrypt the information that passes from a platform's JMX agent to the management client monitoring it.

All classes defined by the JMX specification are currently being transformed.

As you'll see, this step is key in producing touchpoints that can access other, non-JMX technology.

As with any administrative call, the JMX call requires authentication and authorization.

If you are using JMX to gain insight into what a server application is doing, you need a means of identifying and tracking units of work.

I ended up peppering my code with JMX API calls every time I wanted to use my JMX service.

The AdminControl object is used to manage the running instance of an application server by a JMX bean.

It allows to connect to a JMX server and list the exported MBeans and use the attributes or invoke the operations.

The javax. management. AttributeList class from the JMX specification is used to represent the configuration information of config objects.

For example, say you implemented a JMX MBean and wanted to pass a class you created as a parameter to one of its methods.

By using JMX, you can easily write Java code to automatically poll application server metrics and record the data for analysis.

The JMX Remote standard extends JMX to allow external client processes to manage an application.

In essence, all you need to profile an application server running in a remote data center is the JMX URL.

In JMX, MBean has inheritance patterns and notification model and different types.

JMX also supports notification using an event model with filters and broadcasters.

We use the JMX as the standard interface, and we design a MIB to provide the interoperability between mobile-agent and SNMP.

To gain JMX manageability, it only has to follow certain coding conventions for IoC dependency injection.

Your Java application will invoke the JMX client interface provided by WebSphere.

The verbs may be different, but the end result is the same: your MBean becomes visible to the JMX client.

Manual module updates using JMX administration console.

VisualVM uses different technologies to get data from JDK (jvmstat, JMX, Attach API, Serviceablity agent).

There are now separate roles for script-based, web-based, JMX proxy, and status page access, allowing more specific access control.

The leading open source implementation of the JMX standard.

The monitoring code then plugs naturally into the JMX interface to expose the results, as Figure 5 illustrates.

On the client side, the jconsole tool can act as a universal JMX client.

Depending on the activity, a user could request cancellation through a GUI or through a network mechanism such as JMX or Web Services.

Using JMX to provide alerts and exposing statistical summaries.

The JMX Viewer displays the different types of MBeans in a tree representation.

The main emphasis in this tutorial is on gaining programmatic access to JMX instrumentation.

In this example, the JMX code is entirely separate from the code for the managed entity.

To try out this JMX-based admin utility, you must first edit the tomcat-users. xml file under the conf directory of the Tomcat distribution.

JMX management is a standard feature in Java Enterprise containers.

Several mature third-party JMX libraries and tools exist, and JMX support has been integrated into the core Java runtime with Java 5.

The JMX APIs also provide interfaces useful for monitoring the J2EE application server run time environment.

Notify the administrator when job is complete through e-mail or JMX notification.

However, you can also use JMX APIs and the config service feature to obtain essentially any server configuration information.

Since getAttributes is a remote JMX call, multiple calls may incur high communication overhead.

Distri- but ed level provides some defined interfaces and components for managers and developers.

JMX is a standard for Java application resources management.

JMX extensions to monitor the underlying stack have been already prototyped and will likely be included in upcoming 3. 1.

WebSphere system management is built on top of JMX specification.

Agent Level: In this level, the internal architecture of JMX agents is exposed.

The JMX MBeanServer served as the kernel core with MBeans being the component model for plug-in services to the kernel.

The configuration repository client is designed to do this by using JMX.

You can consider wsadmin and JMX applications to perform the task you require.

You'll also see how the log4j settings are initially specified in Config. groovy, and you'll learn how to adjust them dynamically with JMX.

This is possible because an MXBean is a kind of MBean and may be remotely managed using the standard JMX services available in Java 5. 0.

The JMX agent is created, in Tomcat's case, by the org. apache. catalina. mbeans. ServerLifeCycleListener class.

These PMI data can be retrieved on the client side using the JMX interface.

Naming the statistics this way lets JMX tools group and display related information naturally.

You should see Grails in the list of local JMX agents, as shown in Figure 1.

Even among popular commercial NMS offerings, you will find the same general trend -- JMX is not yet natively supported.

In the second line, we create a new session object to use for JMX interactions with the server.

Aims at defining a way to remotely access JMX instrumentation with Web services.

Figure 7 reveals the anatomy of a typical JMX agent.

A JMX focused server simply ends up too static and highly coupled.

If you want to implement the automation process in Java, you can use the JMX API.

In this article, I've shown you how to extend Spring's JMX support to meet your specific application needs.

Specifically, server B will make a secure JMX call to server A to obtain the user's subject.

JMX reporting can be enabled at 2 different levels: CacheManager and Cache.

As of Java 5. 0, the class library and JVM provide a comprehensive management and monitoring infrastructure -- JMX.

Java 5 integrates JMX and JMX remote support into the virtual machine.

Many legacy devices and software systems (such as application servers, databases, and applications) are, in fact, not instrumented with JMX.

A downloadable sample program that collects PMI data using the JMX interface is also included.

JMX registers and accesses management objects using the.

JMX monitoring has also been enabled.

JMX registers and accesses management objects using the ObjectName idiom.

The code implements the JMX NotificationListener interface so that you can see things interactively.

This article will help you understand how to write a JMX client for administration configuration purposes from the JMX Javadoc.

In addition to having its lifecycle managed by Geronimo, a GBean can also expose attributes and operations that are manageable via JMX.

Figure 6 illustrates the JMX objects at the three levels, as well as the interfaces specified by JMX 1. 1.

At its simplest, you can use Spring JMX to register objects using the MBeanExporter class.

These services are mandatory for compliance to JMX 1. 1 -- all agents must provide them.

I want a standard protocol that existing management tools can display and track, so I'll use the JMX API to share performance statistics.

Like many other remote invocation frameworks (such as RMI, EJB, and JAX-RPC), JMX is interface-based.

The standard JMX way to add listeners has limitations.

For example, Java Management Extensions (JMX) services can typically provide a wealth of data about the health of a JVM.

This means that you can play around with the JMX settings all you like without worrying about messing things up permanently.

The example code in Listing 2 runs a single JMeter load test, called BreweryTestPlan. jmx.

This is the generic event signal type in the JMX events notification model.

In this case, we can write our own administrative client to feed information from the JMX APIs to our monitoring system.

Because the JMX approach is fairly complex, you should only use this route if your circumstances require it.

This frees the developer from having to constantly write meaningless registry lookup code, such as that enforced by the JMX API.

Furthermore, they have dependencies themselves (such as JMX or JMS).

In fact, MBeans are managed inside a JMX agent through an MBean server that can load and unload MBeans dynamically.

JMX, for example, provides pretty good summary metrics, but is too shallow for adequate root cause diagnosis.

We now know that creating a capsd plugin, and a pollerd monitor will enable us to integrate OpenNMS with our JMX-enabled ClickMeter.

See Resources for access to JMX 1. 1 specs and more information.

To try out a JMX connection to your Geronimo server, download the latest version of

Each MBean represents a tree node with an object name representation. The JMX Viewer can show

Implementation of Hierarchical Network Management Combined with JMX

A Java Management Extension (JMX) connector that the deploy tool uses to deploy applications

The Architecture and Implementation of Distributed Network Management on JMX

JOPR: support for the JMX standard to enable process definition and runtime monitoring and inspection using any JMX console

Most of the additional support required to manage the monitors through JMX comes from the

Listing 3 illustrates an external configuration for a JMX collector

The steps for getting PMI data via the JMX interface are presented below along with some sample code. These steps will include

The Design and Implementation of JMX-based Remote Job Management System

(You can lift this restriction by using a more advanced JMX feature, dynamic MBeans. )

An Overview of JMX and its Application in Server

Use Groovy's dynamic nature to easily react to JMX events notifications

The architecture and operational model of JMX aim to satisfy the following goals

Simplified JMX API's programmability

Architecture and operational model of JMX

Management System for Integrated Service Platform Based on Multilevel JMX

Using Design Pattern in the Implementation of JMX

Dynamically controllable remote job management system based on JMX

Design of enterprise network management system based on JMX

Research and Design of Dynamic Management Service Based on JMX

Research of network service management model based on JMX

Improving Real-time Monitor NMS Based on JMX

Growing application support for JMX 1. 1

The sample log4j. xml file below shows how to enable Perf4J appenders for JMX