I am having the same probelm.
the JMX console is sometimes flawed in the sense that it wantsw to update all Attributes at the same time.
You should try the nukes JMX console, you will find it when logged under : index.html?module=jmx
1. I'm also having the same problem. Tried the "?module=jmx" solution while logged in as admin and I get the following error:
"Module jmx has not been found".
2. Another comment concerning the O'Reilly paper by Fleury and Viet (http://www.onjava.com/lpt/a/3904):
In the section "Installing and Using Nukes", they state that a MySQL version of Nukes can be downloaded from the JBoss website. They also state that the jboss.org site is using this version. I have been unable to find that download link. Anybody know how to download the MySQL version of Nukes?