#2321 fix exceptionhandler to include HttpMessageNotWritableException

discovery-server/src/main/java/app/metatron/discovery/common/exception/RestExceptionHandler.java

@@ -35,6 +35,7 @@
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.http.converter.HttpMessageNotWritableException;
 import org.springframework.web.HttpRequestMethodNotSupportedException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.ResponseStatus;
@@ -89,7 +90,7 @@ ResponseEntity<ErrorResponse> handleNotReadable(Exception o_O, WebRequest webReq
    * @param o_O the exception to handle.
    */
   @ExceptionHandler({InvocationTargetException.class, IllegalArgumentException.class, ClassCastException.class,
-      ConversionFailedException.class, NullPointerException.class})
+      ConversionFailedException.class, NullPointerException.class, HttpMessageNotWritableException.class})
   ResponseEntity<ErrorResponse> handleMiscFailures(Exception o_O, WebRequest webRequest) {
 
     return errorResponse(HttpStatus.INTERNAL_SERVER_ERROR, new HttpHeaders(), new UnknownServerException(o_O), webRequest);