Accents' ^ ~ are not working in Javafx

Hello,

I received software that uses Javafx, and was in the development phase needing to be finalized. I'm testing it and realized that Portuguese accents, like: '^ ~ and', are not recognized in the TextField. I have already looked for the official doc and in several forums, but I did not see anything that indicated how to solve the problem. Does anyone know how to solve this problem?

* Application details: do not use fxml.

private TextField nomeField;
nome = new Label("Nome:");
nomeField = new TextField();
nomeField.setPrefSize(620.0, 27.0);

HBox dados = new HBox(20);
dados.getChildren().addAll(nome, nomeField, cadastrar);