I am using SEAM 2.1.2 on Jboss 5.1.0GA, I cannot get dataTable to work. The problem is that none of my data show up. I used a debugger to trace on what is going on. It seems that

import java.io.IOException;
import java.util.List;

import javax.faces.context.FacesContext;

import org.ajax4jsf.model.DataVisitor;
import org.ajax4jsf.model.ExtendedDataModel;
import org.ajax4jsf.model.Range;
import org.ajax4jsf.model.SequenceRange;
import org.jboss.seam.Component;
import org.richfaces.model.FilterField;
import org.richfaces.model.Modifiable;
import org.richfaces.model.SortField2;

import com.way.wcc.model.User;
import com.way.wcc.model.UserSearch;
import com.way.wcc.user.dao.UserDao;

public class TestDataModel extends ExtendedDataModel implements Modifiable {
 private Integer rowKey;
 private User dataItem;
 private SequenceRange cachedRange;
 private List<User> cachedItems;

 private static boolean areEqualRanges(SequenceRange range1, SequenceRange range2) {
 if (range1 == null || range2 == null) {
 return range1 == null && range2 == null;
 } else {
 return range1.getFirstRow() == range2.getFirstRow() && range1.getRows() == range2.getRows();
 }
 }
 @Override
 public Object getRowKey() {
 return rowKey;
 }

 @Override
 public void setRowKey(Object key) {
 this.rowKey = (Integer) key;
 this.dataItem = null;

 if (this.rowKey != null) {
 UserDao userDao = (UserDao)Component.getInstance("userDao");
 this.dataItem = (User) userDao.getUser(rowKey);
 }
 }

 @Override
 public void walk(FacesContext facesContext, DataVisitor visitor, Range range,
 Object argument) throws IOException {

 SequenceRange sequenceRange = (SequenceRange) range;
 int first = 0;
 int rows = 5;
 if (this.cachedItems == null || !areEqualRanges(this.cachedRange, sequenceRange)) {

 if (sequenceRange != null) {
 first = sequenceRange.getFirstRow();
 rows = sequenceRange.getRows();
 }

 this.cachedRange = sequenceRange;
 UserDao userDao = (UserDao)Component.getInstance("userDao");
 this.cachedItems = userDao.findUsers(new UserSearch(), first, rows);
 }

 for (User item: cachedItems) {
 visitor.process(facesContext, item.getId(), argument);
 }
 }

 @Override
 public int getRowCount() {
 UserDao userDao = (UserDao)Component.getInstance("userDao");
 return userDao.findUserCount(new UserSearch());
 }

 @Override
 public Object getRowData() {
 return this.dataItem;
 }

 @Override
 public int getRowIndex() {
 return -1;
 }

 @Override
 public Object getWrappedData() {
 return null;
 }

 @Override
 public boolean isRowAvailable() {
 return (this.dataItem != null);
 }

 @Override
 public void setRowIndex(int rowIndex) {
 }

 @Override
 public void setWrappedData(Object data) {
 }

 public void modify(List<FilterField> filterFields, List<SortField2> sortFields) {
 this.cachedItems = null;
 this.cachedRange = null;
 }
}

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:a4j="http://richfaces.org/a4j"
 xmlns:rich="http://richfaces.org/rich">
 <style>
 .rich-filter-input{
 width:50px;
 }
 </style>
 <h:form>
 <a4j:queue requestDelay="100" />
 <rich:messages />
 <rich:dataTable value="#{userListController.userList}" var="row" rows="10"
 reRender="datascroller" width="650">
 <h:column>
 <h:outputText value="#{row.firstName}" />
 </h:column>
 <f:facet name="footer">
 <rich:datascroller id="datascroller" />
 </f:facet>
 </rich:dataTable>
 </h:form>
</ui:composition>