JsonObject gson not processing properly convert to string and int

So I'm writing a REST app right now that receives some JSON from postman and parses it, calls my database, and then spits the object back up to postman (I'm aware this is basically just a GET right now. I've been doing this to get to the bottom of the issue).

I've tested this a few different times. If I return res += company; or res += dept_id back to postman, they both come back with their expected values.

However, if I do my getDepartment(company, dept_id), the func fails and oldDept is not initialized. If I hardcode getDepartment("CoolCarsInc",16) then oldDept is initialized and shows up as expected in the output from postman.

So it seems extremely likely that there's something wrong with how I am converting processedJson.get("company") and processedJson.get("dept_id") to a string and int. What is going on here???

JSON:

{
"company":"CoolCarsInc",
"dept_id":16
}

Code:

// ITEM 7.2 - /department PUT
@Path("putdepartment")
@PUT
@Consumes("application/json")
@Produces("application/json")
public Response putDepartment(
  String incomingJson
  ){
  
  //body comes in as a String, Circle is parsing it
  //or you would use String circleIn and parse it yourself
  //do some validation and update in db in either case
  
  DataLayer dl = null;
  Gson gson = new GsonBuilder().setPrettyPrinting().create();
  String res = "";
  JsonElement receivedJson = new JsonParser().parse(incomingJson);
  JsonObject processedJson = receivedJson.getAsJsonObject();

  String company = processedJson.get("company").toString();
  String dept_name = processedJson.get("dept_name").toString();
  String dept_no = processedJson.get("dept_no").toString();
  String location = processedJson.("location").toString();
  int dept_id = processedJson.get("dept_id").getAsInt;
  
  try {
     dl = new DataLayer(processedJson.get("company"));
     
     Department oldDept = dl.getDepartment(company, dept_id);
     oldDept.setCompany(company);
     oldDept.setDeptName(dept_name);
     oldDept.setDeptNo(dept_no);
     oldDept.setLocation(location);
     oldDept.setId(dept_id);
     dl.updateDepartment(oldDept);

     Department updatedDep = dl.getDepartment(company, dept_id);
     res += gson.toJson(updatedDep);
     
   } catch (Exception e) {
     return Response.status(Response.Status.NOT_FOUND).build();
  } finally {
     dl.close();
  }
  
  return Response.ok("updated department:\n" + res).build();

} 

I am not sure about gson. But you can also use org.json library of java.

import org.json.JSONArray;
import org.json.JSONObject;

Then wrap string into JSONObject.

JSONObject json = new JSONObject(incomingJson);

Then you can access the keys as :

json.getString("company");
json.getInt("dept_id");

For using this library include dependency in pom.xml as:

        <dependency>
			<groupId>org.json</groupId>
			<artifactId>json</artifactId>
			<version>20190722</version>
		</dependency>