I’m trying to deserialize a JSON string (from a http request body) into a protobuf object in Java using the com.google.protobuf.util.JsonFormat class:

JsonFormat.parser().ignoringUnknownFields().merge(new InputStreamReader(requestBody), builder);

The problem is that I’m using an existing protobuf message definition where some fields have been defined as bool while the JSON I’m receiving has these fields as either 0 or 1. When trying to deserialize, this results in exception with the following message: Invalid bool value: 1.

Is there any way to cast 1 and 0 to true and false for a field that has the bool type in the protobuf message definition type when deserializing?