code: @Override
      public String getInitParameter(String name) {
          FilterConfig fc = getFilterConfig();
          if (fc == null) {
              throw new IllegalStateException(
                  lStrings.getString("err.filter_config_not_initialized"));
          }
  
          return fc.getInitParameter(name);
      }
docs: <p>Returns a <code>String</code> containing the value of the named
  initialization parameter, or <code>null</code> if the parameter does
  not exist.  See {@link FilterConfig#getInitParameter}.</p>
  
  <p>This method is supplied for convenience. It gets the
  value of the named parameter from the servlet's
  <code>ServletConfig</code> object.
  
  @param name 		a <code>String</code> specifying the name
  of the initialization parameter
  
  @return String 		a <code>String</code> containing the value
  of the initialization parameter
  
  @since Servlet 4.0