Download JMX

JMX Update
Scott Molenaar
ScottMolenaar@null.net
11/08/2004
Original work by David Moran
Original Slides Created by
David Moran
dmoran@nc.rr.com
10/20/03
Original work by David Moran
Agenda
Overview
Managed Beans
Services
Remote API
J2EE Management
Implementations
Future Directions
Demo
Original work by David Moran
Benefits
JMX is an API to for managing java
applications.
Abstract the instrumentation for management
information to a common interface to facilitate
integrated management.
Distribute management by moving management
functions to the agents.
Real-time deployment of services and updates.
Possible to use to manage any application or
device (via JNI or SNMP etc..)
Original work by David Moran
JMX Architecture
Original work by David Moran
MBeanServer
The core of the agent. It provides a registry for
MBeans.
Allows clients to discover and execute
operations exposed by the MBeans
Makes available various services to facilitate
management (I.e. monitoring, scheduling, etc)
 Use “ObjectName” class to register objects
with the MBeanServer
Original work by David Moran
Instrument your resources as
MBeans
MBean stands for “managed bean”
MBeans can represent a physical device
or an application
You decide which attributes and methods
you want to expose for management.
Use design patterns similar to JavaBeans
MBeans are exposed in an agent.
Original work by David Moran
Standard MBeans
The simplest MBean
Provides a static representation of a
manageable resource.
Implements a management interface of
attributes and methods that a device or
application exposes for management.
Original work by David Moran
Notifications
Can be used to inform registered listeners
with important events or state changes.
Similar to the java event model
Register once to all types of notifications
Can supply a filter to say which
notifications it is interested in.
Original work by David Moran
Dynamic MBeans
Useful if the management interface is not
stable.
The management interface is defined at
runtime.
Developer is responsible for checking the
validity of the invocations.
Original work by David Moran
DynamicMBean Interface
<<Interface>>
DynamicMBean
getAttribute(String attribute)
setAttribute(Attribute attribute)
getAttributes (String[] attributes)
setAttributes(AttibuteList attributes)
getMBeanInfo()
invoke(String actionName, Object[] params)
Original work by David Moran
Model MBeans
Most flexible and thus most complicated
MBeans
Extension of the dynamic MBean
Developers do not write an MBean class
The agent must supply the
RequiredModelMBean and the Management
Interface is defined outside of the Bean via
setter methods.
Features include persistence, logging, and
attribute caching.
Original work by David Moran
Connectors/Adapters
A connector makes a Java Management
Extensions (JMX) API MBean server
accessible to remote Java technologybased clients.
Adapters are similar to connectors except
they provide protocol translations (I.e.
SNMP, HTML, etc.)
Original work by David Moran
Agent Services
Mlet; (Management Applet) Dynamically adds
class files to the server either locally or from a
remote location.
Relation Service; Allows the definition of
relationships between MBeans
Monitors: Observe MBean attributes and emit
notifications when values change.
Timers: Emits user defined notifications at
specific times.
Original work by David Moran
JMX Remote API
Adds remote capability to the JMX spec
Makes the JMX agent accessible from outside
the JVM.
Developed through the JCP JSR 160
Standard support via RMI
Optional support via TCP Sockets (JMXMP)
API is as close as possible to the API defined by
the JMX API.
Also support discovery/lookup services and
defines security between the client and server.
As with RMI code must handle communication
exceptions
Original work by David Moran
J2EE Management
An MBean can get data directly from an
EJB by invoking its access methods.
An MBean can receive data being pushed
from an EJB.
Registers and Deletes an MBean with a
JMX agent upon creation and destruction
of an EJB
Original work by David Moran
J2EE Management Spec JSR77
This specification represents a model of the
J2EE application server, and its
subcomponents, that all J2EE-compliant
application vendors are required to expose
Requires JMX
Part of J2EE 1.4 spec
Specifies the MEJB, which is a session bean, to
expose the agent to remote clients.
Original work by David Moran
Available JMX Implementations
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Sun JDK1.5
JBOSS JBOSS-MX
MX4J
XMOJO
Commercial implementations available;
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Weblogic
Adventnet
XtreamJ
WebSphere Tivioli
Original work by David Moran
Future Directions
 Use of metadata
 Persistence
 Reliable event handling
 Master-agent/sub-agent functionality
 Manageability for J2EE™ apps
Original work by David Moran
Examples
MX4J - Dynamic MBean Example (CacheMBean)
MC4J Console
XMOJO - Model MBean Example (ServerInfo)
XMOJO Web based console
JBoss – “XMBean” Example (CacheMBean)
JBoss Web based console & MC4J Console
JDK1.5 Standard MBeans and JConsole
Original work by David Moran
Books
 JMX in Action
Benjamin G. Sullins, Mark Whipple
Publisher: Manning Publications Company
 JMX: Managing J2EE with Java Management Extensions
Marc Fleury, Juha Lindfors
Publisher: Sams
 Java and JMX: Building Manageable Systems
Heather Kreger, Ward K. Harold, Leigh Williamson,
Ward Harold
Publisher: Pearson Education
 Java Management Extensions
J. Steven Perry
Publisher: O'Reilly & Associates, Incorporated
 JMX Programming
Mike Jasnowski
Publisher: Wiley, John
& Sons, Incorporated
Original work by David Moran
References
 Sun JMX Page:
http://java.sun.com/products/JavaManagement
 JMX Forum jmx-forum@java.sun.com
 JBOSS MX:
http://www.jboss.org/developers/projects/jboss/jbos
smx.jsp
 AdventNet: www.adventnet.com
 http://www.gartner.com/reprints/adventnet/108841.html
 Interview with Chris Ebro
http://www.theserverside.com/events/library.jsp
 JSR77 Article
http://www.onjava.com/pub/a/onjava/2002/03/27/jsr77.html
 Original Slides
http://www.trijug.org/downloads/JMXPresentation.ppt
Original work by David Moran
References continued
 MX4J Page:
http://mx4j.sourceforge.org
 MC4J Page:
http://mc4j.sourceforge.org
 XMOJO Page: http://www.xmojo.org
 Jconsole page:
http://java.sun.com/j2se/1.5.0/docs/t
ooldocs/share/jconsole.html
 Tutorial Page:
http://www.admc.com/blaine/howtos/jmx
/jmx.html
 Article on JMX:
http://www.onjava.com/pub/a/onjava/20
Original work by David Moran
04/09/29/tigerjmx.html