Great that did the trick, thanks a lot. To sum up for anyone else with the same problem. The EntityBean has @Lob public Blob getContent() { return content; } In the Stateful session bean @DataModel private List documentList; @DataModelSelection @In(required=false) @Out(required=false) private Document document; @PersistenceContext private EntityManager em; //You do need to do the merge before accessing the BLOB em.merge(document); Blob blob=document.getContent(); is = blob.getBinaryStream(); .... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973330#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...