code: private static I_CmsResourceBundle tryBundle(String localizedName) {
  
          I_CmsResourceBundle result = null;
  
          try {
  
              String resourceName = localizedName.replace('.', '/') + ".properties";
              URL url = CmsResourceBundleLoader.class.getClassLoader().getResource(resourceName);
  
              I_CmsResourceBundle additionalBundle = m_permanentCache.get(localizedName);
              if (additionalBundle != null) {
                  result = additionalBundle.getClone();
              } else if (url != null) {
                  // the resource was found on the file system
                  InputStream is = null;
                  String path = CmsFileUtil.normalizePath(url);
                  File file = new File(path);
                  try {
                      // try to load the resource bundle from a file, NOT with the resource loader first
                      // this is important since using #getResourceAsStream() may return cached results,
                      // for example Tomcat by default does cache all resources loaded by the class loader
                      // this means a changed resource bundle file is not loaded
                      is = new FileInputStream(file);
                  } catch (IOException ex) {
                      // this will happen if the resource is contained for example in a .jar file
                      is = CmsResourceBundleLoader.class.getClassLoader().getResourceAsStream(resourceName);
                  } catch (AccessControlException acex) {
                      // fixed bug #1550
                      // this will happen if the resource is contained for example in a .jar file
                      // and security manager is turned on.
                      is = CmsResourceBundleLoader.class.getClassLoader().getResourceAsStream(resourceName);
                  }
                  if (is != null) {
                      result = new CmsPropertyResourceBundle(is);
                  }
              }
          } catch (IOException ex) {
              // can't localized these message since this may lead to a chicken-egg problem
              MissingResourceException mre = new MissingResourceException(
                  "Failed to load bundle '" + localizedName + "'",
                  localizedName,
                  "");
              mre.initCause(ex);
              throw mre;
          }
  
          return result;
      }
docs: Tries to load a property file with the specified name.
  
  @param localizedName the name
  @return the resource bundle if it was loaded, otherwise the backup