"alesj" wrote : "alesj" wrote : I guess if I just write lock the deploy and undeploy lists processing, you should be fine. | | | This is not fully sufficient either, | as one could do addDeployment in between the two write locks in process(), | and if this new deployment would actually be re-deploy, | we would only pick up its deploy part, but not the undeploy part. :-( | No. The process() uses snapshots of the to(Un)Deploy. If two threads concurrently do: add(remove)Deployment() process() then they might end up processing each other's stuff but they won't miss one. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4211784#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...