accessing MBean from a web page

[mrzeld]

hello,

i have been looking and looking and have yet to find a definitive example of how to access an MBean from a web page. do i have to implement the RMI interface to do this? is there not an easy way to access MBean's like there is for local EJB's?

i have jboss 3.0.7 with tomcat. my MBean info is:
Domain : com.jrw.jmx
Name : com.jrw.jmx:service=TestJMX
Class Name : com.jrw.jmx.TestJMX
Description : Management Bean.

the MBean has a variable in it (with get/set methods) called "value". i would like to be able to call getValue() from my web page(s).

for right now, i am just running jboss on one server (no clustering or multiple servers, yet).

any suggestions or www links with examples would be greatly appreciated. thanks.

[juhalindfors]

Check the source for the jmx-console in cvs (under varia), its a servlet accessing MBeans. If you need to access MBeans from a different process then lookup the RMIAdaptor from the JNDI and use its interface to interact with MBeans

[mrzeld]

just FYI,

i just happen to have saved a PDF slide presentation from Sun on JMX. i was looking through it and found an example of what i needed. here is the code...



<%@ page import="javax.management.*,java.util.*" %>

...

//Step 1 - Get MBean server reference
ArrayList servers = MBeanServerFactory.findMBeanServer(null);
if (servers == null)
throw new Exception("No MBeanServer found.");
MBeanServer server = (MBeanServer)servers.get(0);
//Step 2 - Create object to identify MBean
ObjectName on = new ObjectName("com.jrw.jmx:service=TestJMX");
//Step 3 - Update MBean Value attribute
String newvalue = (String)request.getParameter("formValue");
if (newvalue != null && newvalue.length() > 0)
{
Attribute attribute = new Attribute("Value", newvalue);
server.setAttribute( on, attribute );
}
//Step 4 - Get latest Value attribute
String value = (String)server.getAttribute( on,"Value");

[coldbeans]

See for example JMX taglib from Coldtags suite:
http://www.servletsuite.com/jsp.htm