Jython is great when you want a dynamically typed language based on the JVM.

Also comes really in handy when you want to write small monitoring scripts based on JMX.This is an examble on how to call a function from a MBean through Jython using JMX.

jmxaction.py

from javax.management.remote import JMXConnector
from javax.management.remote import JMXConnectorFactory
from javax.management.remote import JMXServiceURL
from javax.management import MBeanServerConnection
from javax.management import MBeanInfo
from javax.management import ObjectName
from java.lang import String

from jarray import array
import sys   

if __name__=='__main__':
        
        if len(sys.argv)> 5:
                serverUrl = sys.argv[1]
                username = sys.argv[2]
                password = sys.argv[3] 
                beanName = sys.argv[4]
                action = sys.argv[5]
        else:
                sys.exit(-1)
        credentials = array([username,password],String)
        environment = {JMXConnector.CREDENTIALS:credentials}

        jmxServiceUrl = JMXServiceURL('service:jmx:rmi:///jndi/rmi://'+serverUrl+':9999/jmxrmi');
        jmxConnector = JMXConnectorFactory.connect(jmxServiceUrl,environment);
        mBeanServerConnection = jmxConnector.getMBeanServerConnection()
        objectName = ObjectName(beanName);
        mBeanServerConnection.invoke(objectName,action,None,None)
        jmxConnector.close()

By calling the script

jython jmxaction.py {ip} {jmx user} {jmx password} {mbean name} {action}

You can invoke the action of the mbean specified.