Adding a JavaScript to the onload event in wicket

Html code 

<html>
<body wicket:id="body">
// .....
</body>
</html>

Wicket Code 

WebMarkupContainer body = new WebMarkupContainer("body");

AjaxEventBehavior loader = new AjaxEventBehavior("onload") {
private static final long serialVersionUID = 1L;
@Override
protected void onEvent(AjaxRequestTarget target) {
target.appendJavaScript("alert('welcome on onload');");
}

};
body.add(loader);

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