When using both gRPC and Spring Boot with JPA, I find myself with the situation where I’m forced to write duplicate Java data transfer objects to represent the same thing, and I’m wondering if there is a better way.

So let’s say you have this tika.proto file:

message SaveFetcherRequest {
  string fetcher_id = 1;
  string plugin_id = 2;
  string fetcher_config_json = 3;
}

This will generate a org.apache.tika.SaveFetcherRequest java stub object.

But then JPA uses an Repository that writes from an Entity object.

@Entity
public class Fetcher {
  @Id
  String fetcher_id;
  String plugin_id2;
  String fetcher_config_json;
}

I very much wanted to just use the auto-generated java class without having to re-create that class by hand.

Can such a thing be done?