Using UIField HTML to create a dynamic table

I am trying to build up an MVP GWT APP. Within my view I want to create a dynamic HTML Table which is filled with data coming from an ArrayList by using the @UiField HTML. Right now I can compile my application without errors in eclipse but I can't see my data in the browser. The error I can see in my browser is :

The corresponding source code within my view is:

... @UiField HTML actionTable; ...    public void setRowData(ArrayList<T> rowData) {              this.rowData = rowData;          TableElement table = Document.get().createTableElement();          TableSectionElement tbody;          table.appendChild(tbody = Document.get().createTBodyElement());           for(int i = 0;i<rowData.size(); ++i)           {              TableRowElement row = tbody.insertRow(-1);               T t = rowData.get(i);               for (int j = 0; j < columnDefinitions.size(); ++j) {                  TableCellElement cell = row.insertCell(-1);                  StringBuilder sb = new StringBuilder();                  columnDefinitions.get(j).render(t, sb);                  cell.setInnerHTML(sb.toString());              Element child = cell.getFirstChildElement();                  if (child != null) {                      Event.sinkEvents(child, Event.ONFOCUS | Event.ONBLUR);                  }              }          }          actionTable.setHTML(table.getInnerHTML());      }

The ArrayList comes from my server class in which I set the following data.

public class ActionServiceImpl extends RemoteServiceServlet implements MyActionService {        private static final String[] actionName = new String[] { "Trikots für A-Jugend", "Rollstuhl für Maria" };      private static final double[] targetAmount = new double[] { 1000, 2500 };      private static final double[] donationMinimum = new double[] { 10, 10 };      private static final double[] amountDonationSoFar = new double[] { 258, 742 };      private static final String[] accountName = new String[] { "Max Mustermann", "Maria Musterfrau" };      private static final String[] iban = new String[] { "DE447818032764520919100", "DE4478180328485419100" };          private static final String[] NameOfBank = new String[] { "ABC Bank", "XYZ Bank" };          private final HashMap<String, Campaign> actions = new HashMap<String, Campaign>();      private final HashMap<String, Account> accounts = new HashMap<String, Account>();        public ActionServiceImpl() {          initActions();      }        private void initActions() {            for (int i = 0; i < actionName.length; ++i) {              Account account = new Account(accountName[i], NameOfBank[i], iban[i]);              Campaign action = new Campaign(String.valueOf(i), actionName[i], targetAmount[i], donationMinimum[i],                      amountDonationSoFar[i], account);              accounts.put(account.getName(), account);              actions.put(action.getId(), action);          }      }      @Override      public ArrayList<ShowActions> getShowActions() {          ArrayList<ShowActions> showActions = new ArrayList<ShowActions>();            Iterator<String> it = actions.keySet().iterator();          while (it.hasNext()) {              Campaign action = actions.get(it.next());              showActions.add(action.getActions());          }          return showActions;      }

The corresponding ui.xml looks like that:

<ui:UiBinder     xmlns:ui="urn:ui:com.google.gwt.uibinder"    xmlns:g="urn:import:com.google.gwt.user.client.ui">        <ui:style>          .contactsViewButtonHPanel {           margin: 5px 0px 0x 5px;              }        .contactsViewContactsFlexTable {         margin: 5px 0px 5px 0px;         }      </ui:style>      <g:DecoratorPanel>        <g:VerticalPanel>          <g:HorizontalPanel addStyleNames="{style.contactsViewButtonHPanel}">            <g:Button ui:field="addButton">Add</g:Button>            <g:Button ui:field="removeButton">Delete</g:Button>            <g:Button ui:field="editButton">Add</g:Button>            <g:Button ui:field="donationListButton">Delete</g:Button>             <g:Button ui:field="formButton">Delete</g:Button>          </g:HorizontalPanel>          <g:HTML ui:field="actionTable"></g:HTML>          <!--<g:FlexTable ui:field="contactsTable" addStyleNames="{style.contactsViewContactsFlexTable}"/>  -->        </g:VerticalPanel>    </g:DecoratorPanel>  </ui:UiBinder>

Does anyone have an idea on how to fix my problem? Or is there an other way how I can display my data?

Thank you in advance!

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