I guess the java would look something like this (without type annotations):

java
status = StatusProto.fromThrowable(e);
details = status.getDetails(0);
errorInfo = details.unpack(ErrorInfo.class);
reason = errorInfo.getReason();
metadataMap = errorInfo.getMetadataMap();

the parts that seemed very much unintuitive were knowing about

StatusProto

and knowing to unpack the

details

as

ErrorInfo