page for insert entity Body that share the id of entity Heart .

<ui:composition template="/template.xhtml">
        <ui:define name="title">
            <h:outputText value="#{bundle.CreateBodyTitle}"></h:outputText>
        </ui:define>
        <ui:define name="body">
            <h:panelGroup id="messagePanel" layout="block">
                <h:messages errorStyle="color: red" infoStyle="color: green" layout="table"/>
            </h:panelGroup>
            <h:form>
                <h:panelGrid columns="2">
                    <h:outputLabel value="#{bundle.CreateBodyLabel_id}" for="id" />
                    <h:inputText id="id" value="#{bodyController.selected.id}" title="#{bundle.CreateBodyTitle_id}" />
                    <h:outputLabel value="#{bundle.CreateBodyLabel_heart}" for="heart" />
                    <h:selectOneMenu id="heart" value="#{bodyController.selected.heart}" title="#{bundle.CreateBodyTitle_heart}" >
                        <f:selectItems value="#{heartController.itemsAvailableSelectOne}"/>
                    </h:selectOneMenu>
                </h:panelGrid>
                <br />
                <h:commandLink action="#{bodyController.create}" value="#{bundle.CreateBodySaveLink}" />
                <br />
                <br />
                <h:commandLink action="#{bodyController.prepareList}" value="#{bundle.CreateBodyShowAllLink}" immediate="true"/>
                <br />
                <br />
                <h:link outcome="/index" value="#{bundle.CreateBodyIndexLink}"/>
            </h:form>
        </ui:define>
    </ui:composition>

-------------------------

i get the following expcetion when hi psush the link createBody

object is of type java.lang.String; expected type: mauro.entity.Heart

viewId=/body/Create.xhtml
location=/home/utente_javaee7/NetBeansProjects/progetti_nuovnetbeans/Study_relations_JPA/build/web/body/Create.xhtml
phaseId=RENDER_RESPONSE(6)

Caused by:
java.lang.IllegalArgumentException - object is of type java.lang.String; expected type: mauro.entity.Heart
at mauro.jsf.HeartController$HeartControllerConverter.getAsString(HeartController.java:225)


------------------------------------------------------------------------------

the class HeartControllerConverter

@FacesConverter(forClass = Heart.class)
    public static class HeartControllerConverter implements Converter {

        @Override
        public Object getAsObject(FacesContext facesContext, UIComponent component, String value) {
            if (value == null || value.length() == 0|| value.isEmpty()) {
                return null;
            }
            HeartController controller = (HeartController) facesContext.getApplication().getELResolver().
                    getValue(facesContext.getELContext(), null, "heartController");
            return controller.ejbFacade.find(getKey(value));
        }

        java.lang.Long getKey(String value) {
            java.lang.Long key;
            key = Long.valueOf(value);
            return key;
        }

        String getStringKey(java.lang.Long value) {
            StringBuilder sb = new StringBuilder();
            sb.append(value);
            return sb.toString();
        }

        @Override
        public String getAsString(FacesContext facesContext, UIComponent component, Object object) {
            if (object == null) {
                return null;
            }
            if (object instanceof Heart) {
                Heart o = (Heart) object;
                return getStringKey(o.getId());
            } else {
                throw new IllegalArgumentException("object " + object + " is of type " + object.getClass().getName() + "; expected type: " + Heart.class.getName());
            }
        }