[JAVA] Unhelpful error message in case of empty response with jersey2 library

Description

When the api call fails with no content in the response, the error message of the exception is set to "error". Can it be set to the status line instead so that the stacktrace contains a more helpfull error message?

Swagger-codegen version

2.4.15 but same issue with latest version.

Swagger declaration file content or url

in modules/swagger-codegen/src/main/resources/Java/libraries/jersey2/ApiClient.mustache l719

       String message = "error";
       String respBody = null;
       if (response.hasEntity()) {
          try {
            respBody = String.valueOf(response.readEntity(String.class));
            message = respBody;
         } catch (RuntimeException e) {
           // e.printStackTrace();
         }
       }

Steps to reproduce

generate a client api with jersey2

Related issues/PRs

not reported afaik.

Suggest a fix/enhancement

provide the reason phrase instead of "error", for example :

"Error invoking API : " + response.getStatusInfo().getReasonPhrase();

Open modules/swagger-codegen/src/main/resources/Java/libraries/jersey2/ApiClient.mustache around line 719 and generate a client API with the jersey2 library to reproduce the empty-response failure. Trace the exception message handling for responses without an entity; done means the stack trace uses the response status reason phrase instead of the literal "error".