For some unknown reason HDScanner started a deploy-undeploy infinite loop for my (exploded) application deployment, removing and adding it again and again every 15 seconds or so.
I already tried to remove the application by hand (I normally use seam restart or seam unexplode) and also removed the whole contents of the jboss-5.1.0.GA/server/default/tmp directory to no avail.
I restarted the server, did a clean build and even rolled back a few versions of the application to make sure it was nothing that I have modified.
Apparently the problem is only affecting my application, since I'm able to deploy and use the seam hotel booking example.
Google found me an similar issue logged in JBoss JIRA:
https://jira.jboss.org/jira/browse/JBAS-7114
I couldn't confirm that I have the same issue since apparently the person who reported the bug was debugging Jboss server's code, something I would rather avoid learning how to do right now.
The only workaround I found was to deploy the application as a regular ear archive (which makes for a lot slower development cycle).
Has anyone seem this problem or know how to fix it?