Problem with setText () in java

Hello, I am trying to change the text of a JTextArea from another class, for that create a method that takes care of it, the problem is that when I create the object of the class where the field of type JTextArea is and I try to change it the text with setText () is not displayed at all, but if I print it in the console if the text that I put with the method appears, here the code

Object declaration:

private JTextArea area1;

Initialization:

area1 = new JTextArea();

Giving it size:

area1.setBounds(20, 200, 500, 160);

Add it to the picture:

add(area1);

Here the method with which I try to change the text:

public void setRegistro(String registro) {

    area1.setText(registro);

}

Creating the object from the other class:

        laminaVista vista1 = new laminaVista();

try{

  //codigo no relevante

}catch(IOException e){

  vista1.setRegistro("Mensaje de error");

}