code: @Trivial
      @FFDCIgnore(NamingException.class)
      private String getProviderURL(TimedDirContext ctx) {
          try {
              return (String) ctx.getEnvironment().get(Context.PROVIDER_URL);
          } catch (NamingException e) {
              if (tc.isDebugEnabled()) {
                  Tr.debug(tc, "getProviderURL", e.toString(true));
              }
              return "(null)";
          }
      }
docs: Get the provider URL from the given directory context.
  
  @param ctx
  @return