Instrumenting JBoss mbean parameter values

[med_soft]

I want to hook up a GaugeMonitor to monitor some of the myriad of mbean parameters available in JBoss.

For example, AvailableConnectionCount on a LocalTxPool service mbean to trigger an alert when running low on available database connections.
Problem is, this parameter is an int and when hooking it up to a GaugeMonitor nothing happens, no exception, nothing. Hooking a GaugeMonitor up to a java.lang.Integer parameter on one of my own classes works fine.

There appear to be many int and other primitively- typed parameters throughout the JBoss mbean services. How can these be monitored?

Using JBoss 3.0.8 & 3.2.2RC4. Thanks for any insights.

[juha]

int should work,

if it doesn't, can you send a reproducable test case to the bug tracker?

-- Juha

[med_soft]

Sorry, I posted my question prematurely, so thanks all the more for giving me a push in the right direction. I verified that int does indeed work correctly as you say it should. The problem appears to be with type "long".

Here is a simple test:


jboss.mq:service=InvocationLayer,type=JVM
PingPeriod
30000


After setting the PingPeriod attribute to something nonzero in the monitored mbean, the DerivedGauge attribute value remains at zero. Tried this with other long attributes from other mbeans, including AvailableConnectionsCount as mentioned previously, and got the same result: the DerivedGauge value is zero regardless of the monitored attribute value.

[med_soft]

This topic exposed my previous lack of understanding of how a GaugeMonitor is designed to work.

More information and a solution is available in Sourceforge bugtracker under (rejected) bug #
[ 820164 ] monitoring long-typed attributes

http://sourceforge.net/tracker/index.php?func=detail&aid=820164&group_id=22866&atid=376685