@Override
    public int hashCode() {
        return (super.hashCode() * 31 + Objects.hashCode(result)) * 31 + Objects.hashCode(exception);
    }
Returns the exception of this reply.

@throws IllegalStateException if the type of this reply is not {@link TMessageType#EXCEPTION}
thrift/thrift0.13/src/main/java/com/linecorp/armeria/common/thrift/ThriftReply.java