oh my lord, thanks max, now i can see it too :-( my fault: i copied the hibernate.dialect-propertyline from a internetpage in my browser to jboss tools, but eclipse showed the right syntax without any weird characters i copied the line to a console an that gave me the following: | org.hibernat-e.dialect.PostgreSQL-Dialect | thus hibernate told me the right exception, because such a dialect is not available i only was to blind, because the console ouput did not dispay the weird chars, but when creating my question here i copied the weird chars too :-) anyway, it would be nice if jboss tools would provide a gui to change the databaseconnection like building a new seam project properties->project facets->modify project... i went this way thousand times, this would be the right place once again, thanks a lot max davey View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135392#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...