Spring MVC checkbox issue

I have an array of checkbox which are rendered on the JSP. Checkbox works just fine but when i post the JSP on controller i am not getting just those checkbox which are clicked but all along with bind path variable which is always false, while it should be true if checked. Due to this i am not able to figure out which box were checked and which were unchecked on the page. Here is my JSP -

Code:

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<c:forEach var="sizeVo" items="${menuVO.sizeList}" varStatus="item">
                            <tr class="${item.index % 2 == 0 ? 'odd gradeX' : 'even gradeC'}">         
                            <td><form:hidden path="sizeList[${item.index}].sizeId" id="sizeId" value="${sizeVo.sizeId}"/>
                                <form:checkbox path="sizeList[${item.index}].isChecked" id="sizeSelect" value="on"></form:checkbox>
                            </td>
                            <td>
                                <c:out value="${sizeVo.sizeName}"/>
                            </td>
                            <td>
                                <c:out value="${sizeVo.sizeDesc}"/> 
                            </td>
                            <td><form:input path="sizeList[${item.index}].sizePrice" id="sizePrice" size="20" class="validate[required] small"/></td>                                 
                            </tr>
                            </c:forEach>

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Page model attribute is mainVO which contains sizeVO list. SizeVo has properties like id, name, price ect. In controller if i print i am getting following

Code:

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SizeVO Object {Id: 3, Name: Big, Description: desc - 6, Price: 50, isChecked: false}, SizeVO Object {Id: 4, Name: Half , Description: desc - 2, Price: 10, isChecked: false}

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I want only those checkboxes to bind which are checked, not all of them.