code: @PostConstruct
      public void init() {
          validatedText.focusedProperty().addListener((o, oldVal, newVal) -> {
              if (!newVal) {
                  validatedText.validate();
              }
          });
          validatedPassowrd.focusedProperty().addListener((o, oldVal, newVal) -> {
              if (!newVal) {
                  validatedPassowrd.validate();
              }
          });
          jfxTextArea.focusedProperty().addListener((o, oldVal, newVal) -> {
              if (!newVal) {
                  jfxTextArea.validate();
              }
          });
      }
docs: init fxml when loaded.