code: @Trivial
      protected String processString(String name, String expression, boolean immediateOnly) {
          return processString(name, expression, immediateOnly, false);
      }
docs: This method will process a configuration value for any configuration setting in
  {@link LdapIdentityStoreDefinition} or {@link DatabaseIdentityStoreDefinition} that
  is a string and whose name is NOT a "*Expression". It will first check to see if it
  is a EL expression. It it is, it will return the evaluated expression; otherwise, it
  will return the literal String.
  
  @param name The name of the property. Used for error messages.
  @param expression The value returned from from the identity store definition, which can
  either be a literal String or an EL expression.
  @param immediateOnly Return null if the value is a deferred EL expression.
  @return The String value.