It's working now.
It's my fault. The onclick function needs a return value:
<s:form action="getAccountById" method="post"
name="frm${row.id}" id="frm${row.id}" >
<s:a onclick="this.parentNode.submit();return false;"
href="javascript://">
<c:out value="${row.firstName}" />
<c:out value="${row.lastName}" />
</s:a>
<s:hidden name="acc.id" value="${row.id}" />
</s:form>
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