@Override
            protected void doMergeFrom(Input input,
                    Schema<Object> derivedSchema, Object owner)
                    throws IOException
            {
                RuntimeDerivativeField.this.doMergeFrom(input, derivedSchema,
                        owner);
            }
The class of the message field.
protostuff-runtime/src/main/java/io/protostuff/runtime/RuntimeDerivativeField.java