Hi, for about 1 week I'm trying to find the solution to what I'm doing. So : I'm using: Jboss AS 4.2.1 Jboss Seam 2.0.0 CR1 I want to have selectOneMenu in each row of dataTable to have opportunity to change the subgroup category of each products. The problem is in that, when I'm submitting the form NPE is thrown and it looks like the selectOneMenu value is not setted. I was also trying to change the adnotation in at sungroup to @DataModelSelection and in some way it works, but it always chooses the first value. My files: products.xhtml | <h:dataTable value="#{products}" var="product" rendered="#{products.size >0}"> | <h:column > | <f:facet name="header">Change subgroup</f:facet> | <h:form> | <h:selectOneMenu value="#{GroupsAction.newSubgroup}" > | <s:convertEntity /> | <s:selectItems value="#{subs}" var="sub" label="#{sub.name}" noSelectionLabel="Select subgroup"/> | </h:selectOneMenu> | <h:commandButton action="#{GroupsAction.changeSubgroup(product)}" value="Change"/> | </h:form> | </h:column> | </h:dataTable> | GroupsAction.java | | @Stateful | @Name ("GroupsAction") | @Scope(SESSION) | public class GroupsAction implements Groups{ | | ... | | //@DataModelSelection(value="subs") | private Podgrupy newSubgroup; | | | @PersistenceContext(type=PersistenceContextType.EXTENDED) | private EntityManager em; | | | @DataModel | private List <Materia> products; | | @DataModel | private List <Podgrupy> subs ; | | @Factory("subs") | @Begin(join=true) | public void findSubs(){ | subs = em.createQuery("select pg from Podgrupy pg order by pg.grupy.idgrupy").getResultList(); | } | | @Begin(join=true) | public String changeSubgroup(Materia m){ | System.out.println(newSubgroup.getNazwapodgrupy()); | m.setPodgrupy(newSubgroup); | em.merge(m); | em.flush(); | return "products"; | } | | @Remove @Destroy | public void destroy() {} | | public List<Podgrupy> getSubs() { | return subs; | } | | public void setSubs(List<Podgrupy> subs) { | this.subs = subs; | } | | public Podgrupy getNewSubgroup() { | return newSubgroup; | } | | public void setNewSubgroup(Podgrupy newSubgroup) { | this.newSubgroup = newSubgroup; | } | | ... | } | | I have read I think all topics at forum which are connected with that problem, but I didnt find solution.So anyone have any idea why it dont want to work ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4088726#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...