June 2002
Intermediate to advanced
312 pages
9h 18m
English
Content preview from Java Management ExtensionsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
How Does Dynamic Loading Work?
In this section, we will take a detailed look at the mechanics of the M-Let service. We will first look at an example of how to use an M-Let file to load an MBean from a JAR file. Then we will see how to use the M-Let service as the class loader for MBeans without the use of an M-Let file. For the sake of clarity and brevity, the examples in this section show agent-side code and do not contain complete exception-handling constructs.
We have discussed the tags used in the M-Let file, as well as the getMBeansFromURL( ) method of the M-Let service, which is used to load the MBeans specified in the M-Let file. Now let’s look at a couple of code examples.
getMBeansFromURL( )
The getMBeansFromURL(
)
method allows you to specify the URL of an
M-Let text file that contains the information necessary for the M-Let
service to
load your MBeans. There are two versions of this method. The first
version takes a String that contains the complete
URL to the M-Let text file. (We will deal only with URLs that are of the
file and http varieties
here, although many other protocols are conceivably supported.) Once
an MBean is loaded using getMBeansFromURL( ), it
is then registered with the same MBean server with which the M-Let
service is registered.
Suppose the M-Let text file is called MBeans.txt
and resides in the c:\jmxbook directory on the
local Windows-based filesystem. The URL to the M-Let text file would
then be file:/c:\jmxbook. Furthermore, suppose the contents ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.