Jmx notification problem

Question

There is
getNotificationInfo Successful
The operation [getNotificationInfo] was successfully invoked for the MBean [bean:name=test].
The operation returned with the value:
[Ljavax.management.modelmbean.ModelMBeanNotificationInfo;@1b9d4d8
in http://127.0.0.1:9292/ and
getNotificationInfo button in jconsole doesn't print any error. But there is
21-Feb-2006 17:39:11 RequiredModelMBean getAttributes(String[])
SEVERE: Failed to get "NewNumber": javax.management.AttributeNotFoundException: getAttribute failed: NewNumber is not readable
21-Feb-2006 17:39:11 RequiredModelMBean getAttributes(String[])
SEVERE: Failed to get "NotificationInfo": javax.management.MBeanException: An exception occured while trying to get an attribute value through a RequiredModelMBean
when making some operation on the bean in jconsole. Where should I check?
Tried to extend NotificationBroadcasterSupport class instead of NotificationBroadcaster interface implementation (like is many examples in web), but that gave absolutely no affect....
In general everything must be easy.
The steps seem to be such:
Server must be started, beans must be exported to the server.
The beans that must be listened should implement NotificationBroadcaster interface or extend NotificationBroadcasterSupport class.
On the client side Notification listener on a specific bean on the server must be registered via addNotificationListener. And that addNotificationListener defines the action when notification comes. And notification listener must implement NotificationListener interface.
And that seems to be all, right?

Answer 1

Hi Nikolay,
If you're running on Sun's Tiger JVM you can enable the JMX logging traces:
- start your application with -Djava.util.logging.config.file=<logging.properties>
- use the logging.properties given below:
------------------------------------------logging.properties------------------------------------
handlers= java.util.logging.ConsoleHandler
.level=INFO
java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter
java.util.logging.ConsoleHandler.level = FINEST
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
// Use FINER or FINEST for javax.management.remote.level - FINEST is
// very verbose...
javax.management.level=FINEST
javax.management.remote.level=FINER
------------------------------------------logging.properties------------------------------------
Alternatively you may also try to switch on the traces dynamically - see my
blog on the subject:
http://blogs.sun.com/roller/page/jmxetc?entry=tracing_jmx_what_s_going
Hope this helps,
-- daniel
JMX, SNMP, Java, etc...
http://blogs.sun.com/roller/page/jmxetc
There is
getNotificationInfo Successful
The operation [getNotificationInfo] was successfully
invoked for the MBean [bean:name=test].
The operation returned with the value:
[Ljavax.management.modelmbean.ModelMBeanNotificationIn
fo;@1b9d4d8
in http://127.0.0.1:9292/ and
getNotificationInfo button in jconsole doesn't print
any error. But there is
21-Feb-2006 17:39:11 RequiredModelMBean
getAttributes(String[])
SEVERE: Failed to get "NewNumber":
javax.management.AttributeNotFoundException:
getAttribute failed: NewNumber is not readable
21-Feb-2006 17:39:11 RequiredModelMBean
getAttributes(String[])
SEVERE: Failed to get "NotificationInfo":
javax.management.MBeanException: An exception occured
while trying to get an attribute value through a
RequiredModelMBean
when making some operation on the bean in jconsole.
Where should I check?
Tried to extend NotificationBroadcasterSupport class
instead of NotificationBroadcaster interface
implementation (like is many examples in web), but
that gave absolutely no affect....
In general everything must be easy.
The steps seem to be such:
Server must be started, beans must be exported to
to the server.
The beans that must be listened should implement
nt NotificationBroadcaster interface or extend
NotificationBroadcasterSupport class.
On the client side Notification listener on a
a specific bean on the server must be registered via
addNotificationListener. And that
addNotificationListener defines the action when
notification comes. And notification listener must
implement NotificationListener interface.
And that seems to be all, right?