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This data is a request body, post to my controller:

@RequestMapping(value = "/orders", method= RequestMethod.POST)
public void getOrderRequest(@RequestBody Order order){
// use Drools to calculate and return the result
Here is the entity class:
public class Order{
    private Integer amount;
    private String destination;
    private Float price;
    // getters and setters
I use Drools to calculate the price(fake code):
package rules
import entity.Order
rule "rule1"
    no-loop true
    lock-on-active true
    salience 1
        $s : Order(amount <= 50 && destination=="A") 
        $s.setPrice(1000);
        update($s);
rule "rule2"
    no-loop true
    lock-on-active true
    salience 1
        $s : Order(amount > 50 && destination=="A") 
        $s.setPrice(2000);
        update($s);
This works fine.All rules can be changed and worked without restarting my REST service.
Here is a scenario , a new field added to the order JSON:
{ "amount": 100,
  "destination":"A",
  "customer":"Trump"
Add a new rule: 
If the customer is Trump, then double the price:
rule "rule3"
    no-loop true
    lock-on-active true
    salience 1
        $s : Order(customer == "Trump") 
        $s.setPrice(price * 2);
        update($s);
But I have to add a new variable to my Order class and restart my service.
I wonder that is there any way to make it happen without restarting my REST service ? 
Or can I just handle JSON data dynamically with other BRMSs ? 
If you manage to add values from JSON into Map then you can write your rule like this:
rule "rule3"
    no-loop true
    lock-on-active true
    salience 1
        $s : Order(fields["customer"] == "Trump") 
        $s.setPrice(price * 2);
        update($s);
        
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