After some further investigation I'm now able to do what I want. I can now modify multiple rows at once in one transaction. My SLSB with an added update() method: @Stateless | @Name("recordList") | public class RecordListAction implements RecordList, Serializable { | | private static final long serialVersionUID = 1L; | | @PersistenceContext | private EntityManager em; | | @In | private User user; | | @DataModel | private List<DataValue> dataValues; | | @In | private FacesMessages facesMessages; | | // needed to prevent spurious warning | // getResultList() returns a non generic version of List | @SuppressWarnings("unchecked") | @Factory("dataValues") | public void getDataValues() { | dataValues = em.createQuery( | "select dv from DataValue dv " | + "inner join dv.record as record " | + "inner join dv.dataType as dataType " | + "where record.user.id = :userId") | .setParameter("userId", user.getId()) | .getResultList(); | } | | @TransactionAttribute | public void update() { | for (DataValue dataValue : dataValues) { | em.merge(dataValue); | } | facesMessages.add("Data successfully saved."); | } | | @Remove | public void destroy() { | } | } My corresponding facelet: <h:form> | <rich:panel> | <f:facet name="header">Edit Data</f:facet> | | <ui:repeat var="dataValue" value="#{dataValues}"> | | <s:decorate id="idDecoration" template="layout/edit.xhtml"> | <ui:define name="label"> | <h:outputText value="#{dataValue.dataType.name}" /> | </ui:define> | | <h:inputText value="#{dataValue.value}" /> | </s:decorate> | | </ui:repeat> | | <div style="clear: both"><span class="required">*</span> | required fields</div> | </rich:panel> | | <div class="actionButtons"><h:commandButton | action="#{recordList.update}" value="submit" /></div> | </h:form> Everything fine so far, but I'm now stucked at validating entered data. The actual data is stored in the column "value" of the table "data_value". The column "value" is a varchar(255) in MySQL but its validation rules depend on "data_type_id" which references the table "data_type". To give you an example: There are 2 entries in "data_type". One is a type for e-mail addresses and one for surnames. This results in different validation rules that have to be applied to the same column in table "data_value". Again I'm asking for some hints how to do so. Has anyone some suggestions? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4109528#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...