radio button trouble

11:11:02,383 line:190 ERROR [FeeController->validatePage] Field error in 
object 'feeSetup' on field 'programId': rejected value 
[[Ljava.lang.String;@19fbd7c]; codes 
[typeMismatch.feeSetup.programId,typeMismatch.programId,typeMismatch.java.lang.Long,typeMismatch]; 
arguments 
[org.springframework.context.support.DefaultMessageSourceResolvable: codes 
[feeSetup.programId,programId]; arguments []; default message 
[programId]]; default message [Failed to convert property value of type 
[java.lang.String[]] to required type [java.lang.Long] for property 
'programId'; nested exception is java.lang.NumberFormatException: For 
input string: ",621024"]

Why is it treating the radio input like a multiselect drop down?

Snippet of the template markup.

  <@display.table name="programs" id="program" style="width:90%" sort=
"external"  pagesize=20  size=fullSize export=false defaultsort=2 class=
"defaultTable" partialList=true >
          <@display.column  >
                <input style="width:auto; border:0px;" type="radio" name=
"programId" value="${program.id?c}" />
        </@display.column> 


Snippet of the generated html. Looks like a good radio button to me.

<tr class="oddRow">
<td>                <input style="width:auto; border:0px;" type="radio" 
name="programId" value="621023" />
</td>
<td>621023</td>
<td>Nat Benefit Serv.</td>
<td>National Benefit Services 2</td></tr>
<tr class="evenRow">
<td>                <input style="width:auto; border:0px;" type="radio" 
name="programId" value="621024" />
</td>
<td>621024</td>

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