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First of all, the key sentence:

$(".js-example-tags").select2({
				  tags: true
				})

Don't underestimate that this code is powerful. Add class directly where needed, as shown in the following code:

<div class="form-group required">
               <label class="control-label col-sm-4">Test select2: </label>
               <div class="col-sm-8">
              <form:select path="sett"
                 class="form-control required js-example-tags"
              οnchange="onchange('${}','${}');">
             <form:option value='' label='Please select' />"
              <form:options items="${fns:findSettList()}"
               itemLabel="label" itemValue="value" htmlEscape="false" />
               </form:select>
                </div>
         </div>

Note that there is an onchange method above to

$(".js-example-tags").select2({
                  tags: true
                })

Add to this method. Otherwise it will not be possible.