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form:checkbox inside repeated section
class Filter {
  private String name;
  private boolean enabled;
  // More fields, plus the obvious setters & getters.
}
class MyCommand {  // in the model as "myCommand"
  List<Filter> filters;
  // Lots more, plus the obvious setters & getters.
}

<form:form method="post">
  <c:forEach var="filter" varStatus="stat" items="${myCommand.filters} >
    <!-- wrapping that makes accordion panels not shown -->
    <form:checkbox path="filter.enabled" id="${filter.name}_enabled"/>
    <label for="${filter.name}_enabled">${filter.name}</label>

  </c:forEach>
</form:form>

<input type="checkbox"  ${filter.enabled ? "checked='checked'" : "" }
    name="filters[${stat.index}].enabled" />

<input type="checkbox"  ${filter.enabled ? "checked='checked'" : "" }
     onclick="$('#FilterHidden_${stat.index}').val(this.checked)" />

<input type="hidden" id="FilterHidden_${stat.index}"
    name="filters[${stat.index}].enabled" />