<%@ page contentType="text/html; charset=utf-8" %>
    ...
        <div class="form-group row">
            <label class="col-sm-2 control-label" >
                <spring:message code="addBook.form.unitsInStock.label"/>
            </label>
            <div class="col-sm-3">
                <form:input path="unitsInStock" class="form-control"/>  
            </div>
            <div class="col-sm-6">
                <form:errors path="unitsInStock" cssClass="text-danger"/>
            </div>
        </div>
    ...