Help with Button+Javascript, cannot load from APP/PUBLISHED

Flow
1

Hello,

I want to execute a javascript code when a button is pressed and followed
https://vaadin.com/docs/v8/framework/gwt/gwt-javascript.html

Here is my component code:

package si.web.NLUCentral_Web_vaadin;

import com.vaadin.annotations.JavaScript;
import com.vaadin.ui.Button;

@JavaScript({“sendAudio.js”, “sendAudio-connector.js”})
public class ListenButton extends Button
{
/**
*
*/
private static final long serialVersionUID = 1L;

public ListenButton(String caption)
{
	super(caption) ;
}

}
Do I need to follow also the section “RPC from JavaScript to Server-Side” ?

When I published from Eclipse (has the Vaadin plug-in) the directory APP/PUBLISHED
was not created. What do I need to do in order to have it created?

I created the directory manually and copied the two “.js” files there.
Still, when refreshing the page I get a message saying that load failed for
http://localhost:8080//APP/PUBLISHED/sendAudio.js” as well as for
“sendAudio-connector.js”

Please advice, is there an example of connecting JS to a button?

 Many thanks,
        Yuval