Erro ao inserir Arquivo no Postgre. Help!

LargeObjectManager lobj = ((org.postgresql.PGConnection)con).getLargeObjectAPI();

try
	                {    
	                	    Connection con=getConnection(dataSourceName);	                	   
	                        con.setAutoCommit(false);
	                        LargeObjectManager lobj = ((org.postgresql.PGConnection)con).getLargeObjectAPI();
	                        int n = LargeObjectManager.READ - LargeObjectManager.WRITE;
	                        int oid = lobj.create(n);
	                        LargeObject obj = lobj.open(oid, LargeObjectManager.WRITE);
	                        java.io.File file = new java.io.File(frmMci.getPathFileCube());
	                        FileInputStream fis = new FileInputStream(file);
	                        byte buf[] = new byte[2048];                        
	                        
	                        int s, tl = 0;
	                        while ((s = fis.read(buf, 0, 2048)) > 0) {
	                        	obj.write(buf, 0, s);
	                        	tl += s;
	                        	}
	                        	obj.close();
	                        	PreparedStatement ps = con.prepareStatement("UPDATE \""+schemaname+"\".dw_titulo  SET im_cubo_nome =?, im_cubo=? WHERE id_dw_titulo=?");
	                        	ps.setString(1, file.getName());
	                        	ps.setInt(2, oid);
	                        	ps.executeUpdate();
	                        	ps.close();
	                        	fis.close();
	                        	con.commit();


	                }
	                catch (Exception e)
	                {
	                        e.printStackTrace();
	                }