There is a clustered provided. It is discussed in the clustering documentation. The <org.jboss.ha.singleton> package is another place to start looking. There are examples also.
Hope this is of some help.
thanks for the hints, I had a look at them (was on vacation, so could not answer earlier ;-). They would proove more useful to me, if they would be J2EE-generic...
I (although I did not mention it earlier) was searching for a solution, that would run on multiple J2EE servers. Currently our application needs to run on JBoss and BEA Weblogic, probably support for Websphere will be needed in future. Therefore I'll probably use the database for locking (although unlocking will be tough in case of a power blackout...). Maybe a combination of CMP and some sort of database lock will help here... Any hints on this?
Best regards from Black Forrest, Germany,