How to use

getContainerResponse

method

in

org.apache.wicket.protocol.http.servlet.ServletWebResponse

@Override
public final String call() {
  // add component to mock page
  MockRenderPage page = new MockRenderPage();
  Component component = newComponent("mock");
  page.add(component);
  // render page
  page.renderPage();
  if (isFailOnStatefulPages() && !page.isPageStateless()) {
    throw new WicketRuntimeException("no stateful components allowed");
  }
  // close response and get output
  WicketUtils.getWebResponse().close();
  return ((MockHttpServletResponse) WicketUtils.getServletWebResponse().getContainerResponse()).getDocument();
}