code: private void readPropertiesFiles() {
  
          if (this.messageFileWildcard.isEmpty() || !CoreParameters.LOG_RESOLUTION.get()) {
              // Skip configuration loading
              LOGGER.info(JRebirthMarkers.MESSAGE, "Messages Loading is skipped");
  
          } else {
              // Assemble the regex pattern
              final Pattern filePattern = Pattern.compile(this.messageFileWildcard + "\\.properties");
  
              // Retrieve all resources from default classpath
              final Collection<String> list = ClasspathUtility.getClasspathResources(filePattern);
  
              LOGGER.info(JRebirthMarkers.MESSAGE, "{} Messages file{} found.", list.size(), list.size() > 1 ? "s" : "");
  
              for (final String rbFilename : list) {
                  readPropertiesFile(rbFilename);
              }
          }
      }
docs: Read all configuration files available into the application classpath.