get values from form in controller by auto-mapping

Given:
we expect data send from form, that is fully or partly described in requestListSearchCommand POJO Bean.
We expect that data will be auto-wired by spring and request (POST/GET) parameters values will be set to the bean fields

wrong:

@ModelAttribute("requestListSearchCommand")
public RequestListSearchCommand addSearchParameters(
    @RequestParam(value = "requestListSearchCommand",required=false)
    RequestListSearchCommand requestListSearchCommand) {

if (requestListSearchCommand != null) {  // always FALSE
 requestListSearchCommand = new RequestListSearchCommand();
}
requestListSearchCommand.setSameValue(service.getFromService(randomThing));

Solution:

@ModelAttribute("requestListSearchCommand")
public RequestListSearchCommand addSearchParameters(
    @ModelAttribute(value = "requestListSearchCommand")
    RequestListSearchCommand requestListSearchCommand) {

if (requestListSearchCommand != null) {  // always TRUE
 requestListSearchCommand.setSameValue(service.getFromService(randomThing));
}

Spring does auto-mapping request parameters on parameters beans while bean is getting from model.