Jackson deserialization error handling

Question

My problem is fairly simple : I have the following simple class:

public class Foo {
   private int id = -1;
   public void setId(int _id){ this.id = _id; }
          


        

Answer 1

You might want to let your controller handle the problem by adding a method that handles this specific exception

@ExceptionHandler(HttpMessageNotReadableException.class)
@ResponseBody
public String handleHttpMessageNotReadableException(HttpMessageNotReadableException ex)
{
    JsonMappingException jme = (JsonMappingException) ex.getCause();
    return jme.getPath().get(0).getFieldName() + " invalid";
}

Of course, the line

    JsonMappingException jme = (JsonMappingException) ex.getCause();

might throw a class cast exception for some cases but i haven't encountered them yet.