#
# @(#)file RELEASE_NOTES.txt
# @(#)author Sun Microsystems, Inc.
# @(#)version 1.17
# @(#)lastedit 03/08/22
#
# Copyright 2003 Sun Microsystems, Inc. All rights reserved.
# Use is subject to license terms.
#
---------------------------------------------------------------------------
Java(TM) Management Extensions (JMX(TM)) 1.2.1 Release Notes
---------------------------------------------------------------------------
These Release Notes contain important product notes and list known
restrictions in Java Management Extensions (JMX) 1.2.1. Details of
workarounds to known bugs are given where possible. In cases where there
are differences between these Release Notes and the JMX documentation,
the information in these Release Notes supersedes that in the
documentation.
Contents
~~~~~~~~
1) JMX 1.2.1 Release Information
I. Description
II. Operating Environment
III. Product Restrictions
2) JMX 1.2 Release Information
I. JMX Tracing
II. Product Notes
III. Product Restrictions
1) JMX 1.2.1 Release Information
==================================
I. Description
~~~~~~~~~~~~~~~
Version 1.2.1 of the JMX Reference Implementation is an update of
version 1.2, which provides some important bug fixes. It
also implements the Errata for the 1.2 Maintenance Release of the
Specification, which were published in July 2003.
The changes between versions 1.2 and 1.2.1 of the JMX Reference
Implementation, as defined by the Errata, are as follows:
- Class loader repository can now contain additional class loaders
- Illegal identifiers no longer produce exceptions
- Notification source rewriting has been clarified
- Inconsistency between the specification document, the API
documentation, and the RI regarding currencyTimeLimit has been limited
- Severity values for ModelMBeanNotificationInfo have been clarified
- Optional Model MBean fields have been clarified
- API documentation for getDomains() method of MBeanServer interface
corrected
- Excessive type constraints have been removed from the relation service
documentation
For more information about these changes, see the document
"Errata for JMX Specification, version 1.2" (2003/07/02), which
is downloadable from
http://jcp.org/aboutJava/communityprocess/final/jsr003/index3.html
Note that the JMX API Javadoc bundled with this Reference
Implementation reflects the Errata, and hence differs slightly
from the Javadoc in the JMX 1.2 Specification.
II. Operating Environment
~~~~~~~~~~~~~~~~~~~~~~~~~~
The binary package was built using J2SE 1.4.2 (build 1.4.2-b28).
Testing was performed on the following platforms:
- Solaris 9 operating environment, SPARC processor, with J2SE 1.3.1 and J2SE 1.4.2.
- Redhat Linux 9, with J2SE 1.4.2.
- Windows 2000 Professional Edition, with J2SE 1.4.2.
III. Product Restrictions
~~~~~~~~~~~~~~~~~~~~~~~~~
The following is a list of known restrictions in this release.
1) BugID 4909536
The MBean server's introspection code, which analyses Standard
MBean interfaces to convert them into attributes and
operations, will keep a reference to the last class
introspected even after the introspection is completed.
Therefore, the class and its class loader cannot be garbage
collected.
2) JMX 1.2 Release Information
================================
The following information is directly extracted from the release
notes that accompanied version 1.2 of the JMX Reference
Implementation.
I. JMX Tracing
~~~~~~~~~~~~~~
Traces in the JMX implementation are based on the J2SE logging
capability (provided by classes in the java.util.logging package).
The JMX implementation uses a set of Loggers for sending traces. All
Loggers are contained in the javax.management namespace, which
corresponds to the name of the root package hosting all public JMX
interfaces.
The list below shows the Logger objects used in this implementation
and their corresponding category of activity.
Logger Name Information Logged
----------- ------------------
javax.management.mbeanserver Information about the MBean Server
javax.management.mlet Information from an MLet service
javax.management.monitor Information from a monitor
javax.management.timer Information from a timer
javax.management.notification Information from the notification
mechanism
javax.management.relation Information from the Relation
Service
javax.management.modelmbean Information from the Model MBean
components
javax.management.misc Information sent from any other
class
The following log levels are used in JMX:
JMX log level Description
------------- -----------
Level.FINEST Used to print debugging traces
(useful for diagnosing the JMX
implementation)
Level.FINER Used to print information traces
Level.SEVERE Used to notify of error conditions
NOTE: The JMX 1.2 tracing facility is based on java.util.logging,
which is only available in J2SE 1.4. The JMX 1.2 tracing facility can
still be run with earlier versions of the JDK (1.3), but in this case
the JMX traces will run in a deprecated mode, and will not be available
by default.
Using JMX Trace with JDK 1.3
----------------------------
When running the JMX technology on JDK 1.3, you can still get the
traces by using a Sun proprietary API:
com.sun.jmx.trace.TraceTags defines 3 level of traces:
com.sun.jmx.trace.TraceTags.LEVEL_ERROR
com.sun.jmx.trace.TraceTags.LEVEL_TRACE
com.sun.jmx.trace.TraceTags.LEVEL_DEBUG
com.sun.jmx.trace.TraceImplementation defines a destination for JMX
traces that can be controlled by two system properties:
com.sun.jmx.trace.level=ERROR|TRACE|DEBUG (default is ERROR) lets you
define the trace level.
com.sun.jmx.trace.file=<filename> lets you define a file in which the
traces should be written. If this property is not defined, the traces,
when switched on, will be printed on System.err.
To switch on the traces, you need to:
* Set the com.sun.jmx.trace.level and/or com.sun.jmx.trace.file
properties if you want to override the default settings. You can
set these properties either by using the System.setProperty(),
method or by specifying their value at the Java command line.
* call one of the two following static methods:
- com.sun.jmx.trace.TraceImplementation.init(); activates the traces
using the com.sun.jmx.trace.level and com.sun.jmx.trace.file
properties.
- com.sun.jmx.trace.TraceImplementation.init(int level); Switch on
the traces using the com.sun.jmx.trace.file property, with the given
'level'. Level must be one of:
com.sun.jmx.trace.TraceTags.LEVEL_ERROR
com.sun.jmx.trace.TraceTags.LEVEL_TRACE
com.sun.jmx.trace.TraceTags.LEVEL_DEBUG
II. Product Notes
~~~~~~~~~~~~~~~~~
The following are the major issues addressed in the JMX Specification
maintenance release, v1.2:
1) New MBeanServer Superinterface
The MBeanServer interface in JMX 1.1 was not suitable for exposure
to remote clients because it contained methods only appropriate
for the exporter of the instrumentation and because it did not
declare an appropriate exception for communication failures.
A new parent interface, javax.management.MBeanServerConnection, has
been added.
2) New removeNotificationListener Methods
MBeanServer.removeNotificationListen
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