On my case, this code snippets runs on Oracle 9i, but when I deploy the WAR using Oracle 10g as the backend, exception occured on casting here is the code: if (id!= null) { stmt2=conn.prepareStatement("SELECT content from pps_designdocument_revs where id = "+id); rs=stmt2.executeQuery(); if (rs!=null && rs.next()){ oracle.sql.BLOB objectBlob = (oracle.sql.BLOB)rs.getObject("CONTENT"); byte[] buffer = new byte[objectBlob.getBufferSize()]; int bytesRead = 0; inputStream = desDocRev.getContents(); outputStream = objectBlob.getBinaryOutputStream(); while ((bytesRead = inputStream.read(buffer)) != -1){ outputStream.write(buffer, 0, bytesRead); } outputStream.flush(); outputStream.close(); inputStream.close(); conn.commit(); } DataSourceBroker.close(rs); DataSourceBroker.close(stmt2); }else{ conn.rollback(); } Here is the error: javax.servlet.ServletException: oracle.sql.BLOB cannot be cast to oracle.sql.BLOB View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4049572#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...