When the deployment code fails to create a table, it rather silently ignores the issue.

Log fragment:
2007-05-31 15:48:45,646 DEBUG [org.hibernate.tool.hbm2ddl.SchemaUpdate] create table UserRight_`group` (rights_id int8 not null, userGroups_id int8 not null)
2007-05-31 15:48:45,651 ERROR [org.hibernate.tool.hbm2ddl.SchemaUpdate] Unsuccessful: create table UserRight_`group` (rights_id int8 not null, userGroups_id int8 not null)
2007-05-31 15:48:45,651 ERROR [org.hibernate.tool.hbm2ddl.SchemaUpdate] ERROR: syntax error at or near "`"

JBoss finished the whole deployment and does not give any other complaints than this. My suspicion is that SchemaUpdate catches an exception somewhere, prints this line but then forgets to pass on the exception, causing the EJB deployment to "succeed" incorrectly.

Table UserRight_`group` was an automatic concatenation, due to a ManyToMany relation between entity UserRight and entity Group, where the latter was escaped using back ticks, as described here: http://jira.jboss.org/jira/browse/EJBTHREE-637
A bugreport about the incorrect name can be found here: http://jira.jboss.org/jira/browse/EJBTHREE-976