I have an @Entity with composite @EmbeddedId primary key. When I do a query like: SELECT COUNT(*) FROM TheEntity AS theEntity WHERE theEntity.blablablabla then everything works, but when I replace this with: SELECT COUNT(theEntity) FROM TheEntity AS theEntity WHERE theEntity.blablabla then Hibernate fails on it with the following error: Caused by: java.sql.SQLException: Syntax error: Encountered "," at line 1, column 39. The SQL statement that he tried to execute looks like select count((theEntity.a, theEntity.b)) as col_0_0_ from TheEntity theEntity where theEntity.a=? I'm using the default HSQL DefaultDS that comes with JBoss 4.0.5.GA Is this a bug, or is it just me? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993011#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...