Immutable class as query param holder - Spring MVC

I want to make my query param class immutable (with public final fields set via constructor). Is there a way to enforce SearchQueryParam instance creation via constructor and do not expose dreadful getters/setters?

Here is sample code which works:

@RequestMapping(value = "/search", method = GET, produces = APPLICATION_JSON_VALUE)
public List<Result> search(SearchQueryParam searchQueryParam) {
        //do stuff;
}


public class SearchQueryParam {
    @DateTimeFormat(iso = DATE_TIME)
    private DateTime from;
    @DateTimeFormat(iso = DATE_TIME)
    private DateTime to;

    public DateTime getFrom() {
        retu from;
    }

    public void setFrom(DateTime from) {
        this.from = from;
    }

    public DateTime getTo() {
        retu to;
    }

    public void setTo(DateTime to) {
        this.to = to;
    }
}

but I would like my SearchQueryParam class look more like this:

public final class SearchQueryParam {

    @DateTimeFormat(iso = DATE_TIME)
    public final DateTime from;
    @DateTimeFormat(iso = DATE_TIME)
    public final DateTime to;

    public SearchQueryParam(DateTime from, DateTime to) {
        this.from = from;
        this.to = to;
    }
}