Seems to be some problems with parentheses. There are to few of them, dont know where to put them. stmt.executeUpdate("UPDATE kunde SET KFORNAVN=('"+request.getParameter("Fornavn")
+"', KMellomnavn = '"+request.getParameter("Mellomnavn")+"', KETTERNAVN = '"+request.getParameter("EtterNavn")
+"', KADRESSE = '"+request.getParameter("Adresse")+"', KTLF ='"+request.getParameter("Tlf")
+"', KMOB_TLF = '"+request.getParameter("Mob")
+"', K_EPOST = '"+request.getParameter("Epost")+"', POSTNR = '"+request.getParameter("Postnr")
+"', AKTIV = '"+ "" + "'" + "' WHERE KNR = ('"+request.getParameter("KNR" )+"')"); Thank you