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Encoder with <t: loop> component in Tapestry

I have one page that displays the details of some client. I use t:loopto display some data. As t:loopI just pass sourceand value. So far so good, my page is working fine. But when I try to submit a page, it suddenly gives me an Exception.

"Could not find coercion of type java.lang.String for input [addressUsageValue] Available coercion: .........."

Below is a sample code

<t:loop source="addressUsageInfo" value="addressUsageValue">
                  <tr>
                              <td>${addressUsageValue?.usage}</td>
                              <td>${addressUsageValue?.address}</td>
                              <td>${addressUsageValue?.postCode}</td>
                              <td>${addressUsageValue?.city}</td>
                              <td>${addressUsageValue?.country}</td>
                  </tr>
</t:loop>

I studied a little and found the links below.

http://tapestry.apache.org/5.3.3/apidocs/org/apache/tapestry5/corelib/components/Loop.html https://issues.apache.org/jira/browse/TAP5-609

, Loop. . toClient() toValue() null.

private final ValueEncoder<DtoAddressUsageInfo> addressUssageEncoder = 
    new ValueEncoder<DtoAddressUsageInfo>() {

    public String toClient(DtoAddressUsageInfo value) {
          return String.valueOf(value.getUsage());
    }

    public DtoAddressUsageInfo toValue(String clientValue) {
          return null;
    }

};

, .

- , ? ,

- Encoder - . , toValue() toClient() ?

- - , Encoder??

+5
2

formState encoder : , , , ?

, , , formState="iteration" ( ).

, , render submit, , . ValueEncoder ( , ). , , (toClient()) (toValue()).

Loop, .

+7

Henning . null . , . . Boolean . -. '' onClick . - ( ) . formstate = "", .

<t:loop t:source="treeNodeList" value="treeNode" 
t:encoder="treeNodeEncoder" formState="iteration">
    <tr style="text-align:center;">
        <td class="table-checkbox" id="data-table-1st-col">
        <input t:type="checkbox" value="currentSelectedTreeNode" 
        onclick="this.form.submit();"/>

    ....

        </td>
    </tr>
</t:loop>
+1

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