"getaceres" wrote : ... Hibernate assumes that it is oid... No Problem, you have to redefine the default Postgres Dialect, that hibernate uses. For a better understanding: when you look in org.hibernate.dialect.PostgresDialect you will see: registerColumnType( Types.BLOB, "oid" ); You must extend these dialect with your own Implementation, and simple re-register the Types.BLOB to whatever you want (and postgres accepts). Then you must tell hibernate, to use your own dialect for postgres (either in hibernate.cfg or persistence.xml): <property name="hibernate.dialect" value="my.com.xyz.OwnPostgresDialect" /> | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4195642#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...