new org.dbflute.helper.jprop.JavaPropertiesReader("test.properties", null);
                java.lang.reflect.Field readerPropsField = reader.getClass().getDeclaredField("_plainProperties");
                readerPropsField.setAccessible(true);
                readerPropsField.set(reader, props);

                org.dbflute.helper.jprop.JavaPropertiesResult result = reader.read();