400 Bad Request when sending data using Ajax in Spring Framework

Trying to pass JavaScript object to Spring MVC. I get a 400 Bad Request error. Tried all different ways but still no luck. I've attached the Controller, the objects I'm passing in JS and Java and the response. I will really appreciate. When I change the @RequestBody to @ModelAttribute, I receive the parameter in the controller, but the integer is zero and the array is empty.

controller

    @RequestMapping(value="/getInstrumentsByTypeMakeModel" , method=RequestMethod.GET)
    public @ResponseBody List<Instrument> getInstrumentsByTypeMakeModel(@RequestBody SearchInstrument search) {
     // do Something and create searchResult;   
    return searchResult;
}

javascript

var searchInstrument = {

    operator: siteOperator,
    companyId:loggedInUserCompanyId ,
    isServiceProvider:isServiceProvider ,
    types:selectedType,
      makes:selectedMake,
      models:selectedModel,
      typeOthers:selectedTypeOther,
      makeOthers:selectedMakeOther,
      modelOthers:selectedModelOther

    };



     jQuery.ajax({
         url:server_name+ "/getInstrumentsByTypeMakeModel",
         type: "GET",
        dataType: "JSON",
        data:JSON.stringify(searchInstrument),   
         contentType: 'application/json; charset=utf-8',
         success: function(resultData) {
             console.log(resultData);
            },
             error: function(jqXHR, status) {
                 // error handler

            }
        }); 

SearchInstrument class

public class SearchInstrument  {
    public SearchInstrument(){

    }

        public SearchInstrument(int operator,int companyId, boolean isServiceProvider,
                List<Integer>  types,List<Integer>  makes,  List<Integer>  models,
                List<String>  typeOthers,List<String>  makeOthers,List<String>  modelOthers
                ){

this.operator=operator;
this.companyId=companyId;
this.types=types;
this.makes=makes;
this.models=models;
this.typeOthers=typeOthers;
this.makeOthers=makeOthers;
this.modelOthers=modelOthers;
        }
        private int operator;
        private int companyId;
        private boolean isServiceProvider;
        private List<Integer>  types=new ArrayList<Integer> ();
        private List<Integer>  makes=new ArrayList<Integer> ();
        private List<Integer>  models=new ArrayList<Integer> ();    
        private List<String>  typeOthers=new ArrayList<String> ();
        private List<String>  makeOthers=new ArrayList<String> ();
        private List<String>  modelOthers=new ArrayList<String> ();

//getters and setters       

    }

[this is the parameter] [ https://i.stack.imgur.com/2cxde.png]

[This is the URL:] [ https://i.stack.imgur.com/BPMaS.png]