Command Line Monitoring of Thread Pool Sizes

Want to periodically view the OC4J thread pool sizes from the command line?

Using Groovy + JMX , its dead simple:

import demo.oc4j.jmx.*;
import java.text.*;

def period = 5000L
def client = new OC4JClient()
def df = DateFormat.getTimeInstance(DateFormat.LONG)

try {
    client.connect("service:jmx:rmi://10.187.112.178:23791",
               "oc4jadmin", "welcome1")
    println "$client\n" 
    
    http = client.helper.createGroovyMBean(
  "oc4j:j2eeType=ThreadPool,name=http,J2EEServer=standalone")
    system = client.helper.createGroovyMBean(
  "oc4j:j2eeType=ThreadPool,name=system,J2EEServer=standalone")
    jca=client.helper.createGroovyMBean(
 "oc4j:j2eeType=ThreadPool,name=jca,J2EEServer=standalone")

    while(true) {
        now = df.format(new Date(System.currentTimeMillis()));
        println "$now HTTP:[$http.poolSize] JCA:[$jca.poolSize] System:[$system.poolSize]"
        Thread.sleep(period)        
    }
} finally {
    println 'Closing'
    client.close()
}

This makes use of the OC4J helper library, which you can access here.

A simple script to run this would look like this:

@setlocal
set J2EE_HOME=d:\java\oc4j-10133-prod\j2ee\home
set GROOVY_HOME=d:\java\groovy-1.0
set classpath=lib\oc4jgroovy.jar;%GROOVY_HOME%\lib\commons-cli-1.0.jar;/
%GROOVY_HOME%\embeddable\groovy-all-1.0.jar;%J2EE_HOME%\admin_client.jar;%J2EE_HOME%\oc4jclient.jar
java -classpath %CLASSPATH% groovy.lang.GroovyShell src\threadlevel.groovy
@endlocal

When the script is run, it produces this sort of output:

Client is connected to: rmi://10.187.112.178:23791 oc4jadmin [connectionCaching:
true, httpTunneling:false, locale:not set]

1:03:54 HTTP:[7] JCA:[1] System:[7]
1:03:59 HTTP:[7] JCA:[1] System:[7]
1:04:06 HTTP:[7] JCA:[1] System:[7]
1:04:11 HTTP:[7] JCA:[1] System:[7]

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