JBoss Community

Hi there,

to monitor FreeMemory in org.jboss.system.server.ServerInfo on a regular basis I would like to connect to 4.2.1.GA with the help of a groovy script and execute some actions in the groovy script if the FreeMemory goes under a critical value. Also I would like to log the FreeMemory over the time, which could be done in the groovy script as well.

When using the jmx console with the browser I can show the wanted value as can be done with executing twiddle.

Accessing from twiddle works fine

 

C:\Programme\jboss-4.2.1.GA\bin>twiddle -s vm-appsfs4p:1099 get "jboss.system:type=ServerInfo" FreeMemory

FreeMemory=320676872

 

I tried quite a few code snippets from the internet and tried different permutation of URL syntax

import java.lang.management.*
import javax.management.ObjectName
import javax.management.remote.JMXConnectorFactory as JmxFactory
import javax.management.remote.JMXServiceURL as JmxUrl

def serverUrl = "service:jmx:rmi:///jndi/rmi://vm-appsfs4p:1099/jmxrmi"
String beanName = "jboss.system:type=ServerInfo"

def server = JmxFactory.connect(new JmxUrl(serverUrl)).MBeanServerConnection

def mbean = new GroovyMBean(server, beanName)

println "Connected to:\n$dataSystem\n"

println mbean.FreeMemory;

Here's what my output looks like

 

C:\temp>jmx.groovy

 

Caught: java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException

[Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:

        java.net.SocketException: Software caused connection abort: recv failed]

        at jmx.run(jmx.groovy:9)

 

What am I doing wrong? Please be kind as those are my first experiments in this area.

I'd be happy if someone could help me with this, thanks in advance for your help

Take care

Andreas