code: protected void parsePropertiesFile(InputStream propertiesInputStream) throws IOException,
              CommandLineParsingException {
          Properties props = new Properties();
          props.load(propertiesInputStream);
          if (props.containsKey("strict")) {
              strict = Boolean.valueOf(props.getProperty("strict"));
          }
  
          for (Map.Entry entry : props.entrySet()) {
              try {
                  if ("promptOnNonLocalDatabase".equals(entry.getKey())) {
                      continue;
                  }
                  if (((String) entry.getKey()).startsWith("parameter.")) {
                      changeLogParameters.put(((String) entry.getKey()).replaceFirst("^parameter.", ""), entry.getValue
                              ());
                  } else {
                      Field field = getClass().getDeclaredField((String) entry.getKey());
                      Object currentValue = field.get(this);
  
                      if (currentValue == null) {
                          String value = entry.getValue().toString().trim();
                          if (field.getType().equals(Boolean.class)) {
                              field.set(this, Boolean.valueOf(value));
                          } else {
                              field.set(this, value);
                          }
                      }
                  }
              } catch (NoSuchFieldException ignored) {
                  if (strict) {
                      throw new CommandLineParsingException(
                              String.format(coreBundle.getString("parameter.unknown"), entry.getKey())
                      );
                  } else {
                      Scope.getCurrentScope().getLog(getClass()).warning(
                              LogType.LOG, String.format(coreBundle.getString("parameter.ignored"), entry.getKey())
                      );
                  }
              } catch (IllegalAccessException e) {
                  throw new UnexpectedLiquibaseException(
                          String.format(coreBundle.getString("parameter.unknown"), entry.getKey())
                  );
              }
          }
      }
docs: Reads various execution parameters from an InputStream and sets our internal state according to the values
  found.
  
  @param propertiesInputStream an InputStream from a Java properties file
  @throws IOException                 if there is a problem reading the InputStream
  @throws CommandLineParsingException if an invalid property is encountered