How do I display data with dataTable ?

From my debug page the query is able to fetch one row of data, but why the rowAvailable is false? How do I set it to true? Is this what cause my data is not able to be displayed?

class class org.jboss.seam.jsf.ListDataModel
dataModelListeners []
rowAvailable false
rowCount 1
rowData java.lang.IllegalArgumentException[null]
rowIndex -1
wrappedData [com.taxandtech.smerp.model.Supplier@1776426]
toString() org.jboss.seam.jsf.ListDataModel@1187f9

class class org.jboss.seam.jsf.ListDataModel
dataModelListeners []
rowAvailable false
rowCount 1
rowData java.lang.IllegalArgumentException[null]
rowIndex -1
wrappedData [com.taxandtech.smerp.model.Supplier@1776426]
toString() org.jboss.seam.jsf.ListDataModel@1187f9

@Stateful
@Scope(ScopeType.SESSION)
@Name("supplierAction")
public class SupplierAction implements SupplierService, Serializable
{
 private static final long serialVersionUID = -3563521924777729108L;

 @PersistenceContext(type=PersistenceContextType.EXTENDED) EntityManager em;
 @In private FacesMessages facesMessages;
 @Out @In(create=true) Supplier supplier;
 @DataModel List<Supplier> suppliers;
 @Logger private static Log log = Logging.getLog(SupplierAction.class);

 @Create @Begin(nested=true, pageflow="supplier")
 public void begin(){}

 @Restrict public void save()
 {
 log.debug("Supplier name = #0", supplier.getName());
 em.persist(supplier);
 facesMessages.add("Successfully saved");
 }

 public String search()
 {
 log.debug("Supplier name (in) = #0", supplier.getName());
 suppliers = (List<Supplier>)searchQuery(supplier.getName()).getResultList();

 Iterator iterator = suppliers.iterator();

 while(iterator.hasNext())
 {
 supplier = (Supplier)iterator.next();
 log.debug("Supplier name (out) = #0", supplier.getName());
 }

 return "searchSupplier";
 }

 public List<Supplier> getSuppliers()
 {
 return suppliers;
 }

 public void setSuppliers(List<Supplier> suppliers)
 {
 this.suppliers = suppliers;
 }

 public Query searchQuery(String name)
 {
 return em.createQuery("from Supplier s where s.name like :name").setParameter("name", name);
 }

 public void reset() {}

 @Remove @Destroy
 public void destroy() {}
}

 <f:subview rendered="#{!suppliers.rowAvailable}">
 <h:outputText value="#{messages['nodata']}"/>
 </f:subview>

 <f:subview rendered="#{suppliers.rowAvailable}">
 <h:outputText value="#{suppliers}" />
 <h:dataTable id="suppliers" value="#{suppliers}" var="supplier">
 <h:outputText value="#{supplier.name}" />
 </h:dataTable>
 </f:subview>