Spring bind collection to checkbox

Here is an example in JSP to bind a collection as checkboxes with spring form:checkbox.

<c:forEach varStatus="status" var="product" items="${command.products}">
<form:checkbox path="products[${status.index}].productId" value="${product.id}" />
</c:foreach>

Note the command will always have the collection "products". However, the selected ones - the ones with checkbox checked, will have valid "id" values. This is the way to tell which ones are selected.