How to call Java method from another class using @ClientCallable?

Flow
1

Vaadin code:

@Route("")
@JsModule("./src/testen_funktion.js")
public class HelloWorldView extends VerticalLayout {
  private Button button = new Button();
public HelloWorldView() {
    add(button);
    button.setText("Testen");
    button.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
    button.addClickListener(event -> {
      getElement().executeJs("registerWebAuthn2(this)")
          .then(encodedCredential -> {
            // some code
            }
          });
    });
  }

I use the executeJs() function to call a Js function called registerWebAuthn2 in the testen_funktion.js.

Java code:

public class TestTool {
    public static void main(String[] args) throws IllegalArgumentException, NoSuchAlgorithmException {
        MFAClientTool client = new MFAClientTool("https://test-server.com", "testuser",
                "password");
        // the rest of the code
    }
}

My question is how to use the method from the class TestTool inside the class HelloWorldView. I suppose I have to use the @ClientCallable annotation. Can you help me here?

2

Nobody can help me?

3

You are on the Java side. You can call your Java function. Maybe I didn’t understand what you’re trying to do

4

How would you do that?

5

If you just want to call the main method in your test tool class from the view it would be TestTool.main(new String[0])

6

Or something along those lines

7

I probably wouldn’t put that in a psvm method though as it suggests it’s an entry point into your program