Hi, I'm a Seam newbie and I'm trying to get my head around si:selectItems and the Seam application framework. My CustomerType object has a String id so when I initially tried to use si:selectItems without creating and specifying a converter I got an exception: <h:selectOneMenu value="#{ customerHome.instance.customerType}" id="customerType"> | <si:selectItems value="#{customerTypes.resultList}" var="customerType" label="#{customerType.name}" noSelectionLabel="Please Select..." /> | </h:selectOneMenu> javax.faces.convert.ConverterException: javax.faces.application.FacesMessage@154fe9c com.mycomp.myapp.CustomerType | at org.jboss.seam.selectitems.ui.BasicEntityConverter.getIdAsString(BasicEntityConverter.java:61) | at org.jboss.seam.selectitems.jsf.EntityConverter.convertToString(EntityConverter.java:36) | at org.jboss.seam.selectitems.jsf.SelectItemsConverter.getAsString(SelectItemsConverter.java:131) | at org.apache.myfaces.shared_impl.renderkit.RendererUtils.getConvertedStringValue(RendererUtils.java:544) | ... | | Caused by: java.lang.NullPointerException | at org.jboss.seam.selectitems.ui.BasicEntityConverter.getIdAsString(BasicEntityConverter.java:59) | ... 43 more So I then created a CustomerTypeSelectItemsConverter which extends SelectItemsConverter: @Name("customerTypeSelectItemsConverter") | public class CustomerTypeSelectItemsConverter extends org.jboss.seam.selectitems.jsf.SelectItemsConverter { | | @Override | protected Object convertToObject(FacesContext arg0, UIComponent arg1, String arg2) | throws ConverterException { | return arg2; | } | | @Override | protected String convertToString(FacesContext arg0, UIComponent arg1, Object arg2) | throws ConverterException { | return ((CustomerType)arg2).getId(); | } | | } and changed my facelets code: <h:selectOneMenu value="#{customerHome.instance.customerType}" converter="#{customerTypeSelectItemsConverter}" id="customerType"> | <si:selectItems value="#{customerTypes.resultList}" var="customerType" label="#{customerType.name}" noSelectionLabel="Please Select..." /> | </h:selectOneMenu> | This gets my drop down list displaying correctly but gives me a validation error "value is not valid" when I try to save. I presume this means that I should be returning a CustomerType object (rather than the CustomerType object's id) from CustomerTypeSelectItemsConverter's convertToObject() method? Am I on the right lines now? If so, what is the correct way for me to obtain the CustomerType object? Should I somehow be getting the List from the Seam Application Framework EntityQuery object ("customerTypes") that was used to populate the si:selectItems tag and then iterating the List to find find the CustomerType with the specified id? Or is there a better way? Any help would be greatly appreciated as I can't find any examples which match my problem and I'm struggling to find any answers... Thanks, Lawrie View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4008752#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...