Cor da borda TextView JavaFX

Vc esta’ referindo ao TextArea, ou TextField se for e’ simples, faça por css, se tiver problemas de performance podera’ colocar ele em um arquivo e tranforma-lo em binario.

import javafx.application.Application;

import javafx.geometry.Insets;

import javafx.scene.Group;

import javafx.scene.Scene;

import javafx.scene.control.TextField;

import javafx.scene.layout.GridPane;

import javafx.scene.layout.HBox;

import javafx.scene.layout.VBox;

import javafx.scene.paint.Color;

import javafx.stage.Stage;

public class BorderColor extends Application {

public static void main(String[] args) {
    Application.launch(args);
}

@Override
public void start(Stage primaryStage) {
     
    TextField field1 = new TextField();
    TextField field2 = new TextField();
    TextField field3 = new TextField();
     
    primaryStage.setTitle("Borders");
    Group root = new Group();        
    Scene scene = new Scene(root, 600, 330, Color.WHITE);

    field1.setText("Texto de Exemplo");
    
    
    // final String cssDefault = "-fx-border-color: blue;\n"
    //        + "-fx-border-insets: 5;\n"
    //        + "-fx-border-width: 3;\n"
    //        + "-fx-border-style: dashed;\n";
          
    final String cssDefault = "-fx-border-color: red;-fx-border-width: 4;";        
    field1.setStyle(cssDefault);
    
    final VBox pictureRegion = new VBox(10);
    pictureRegion.setPadding(new Insets(10,10,10,10));

    
    
    pictureRegion.getChildren().addAll(field1,field2, field3);
    
    
    
    root.getChildren().add(pictureRegion);        
    primaryStage.setScene(scene);
    primaryStage.show();
}

}