How to use

org.apache.wicket.markup.head.JavaScriptUrlReferenceHeaderItem

constructor

/**
 * Creates a {@link JavaScriptUrlReferenceHeaderItem} for the given url.
 *
 * @param url
 *            context-relative url of the the javascript resource
 * @param id
 *            id that will be used to filter duplicate reference (it's still filtered by URL
 *            too)
 * @param defer
 *            specifies that the execution of a script should be deferred (delayed) until after
 *            the page has been loaded.
 * @param charset
 *            a non null value specifies the charset attribute of the script tag
 * @return A newly created {@link JavaScriptUrlReferenceHeaderItem} for the given url.
 */
public static JavaScriptUrlReferenceHeaderItem forUrl(String url, String id, boolean defer,
  String charset, String condition)
{
  return new JavaScriptUrlReferenceHeaderItem(url, id, defer, charset, condition);
}

/**
 * Creates a {@link JavaScriptUrlReferenceHeaderItem} for the given url.
 *
 * @param url
 *            context-relative url of the the javascript resource
 * @param id
 *            id that will be used to filter duplicate reference (it's still filtered by URL
 *            too)
 * @param defer
 *            specifies that the execution of a script should be deferred (delayed) until after
 *            the page has been loaded.
 * @param charset
 *            a non null value specifies the charset attribute of the script tag
 * @return A newly created {@link JavaScriptUrlReferenceHeaderItem} for the given url.
 */
public static JavaScriptUrlReferenceHeaderItem forUrl(String url, String id, boolean defer,
  String charset, String condition)
{
  return new JavaScriptUrlReferenceHeaderItem(url, id, defer, charset, condition);
}

        null));
header.render(
    new JavaScriptUrlReferenceHeaderItem(
        ResponseUtils.buildURL(base, "/openlayers3/ol.js", null, URLType.RESOURCE),
        null,

  @Override
  public void renderHead(Component component, IHeaderResponse response) {
    HttpServletRequest req =
        getGeoServerApplication().servletRequest(getRequest());
    String baseUrl = baseURL(req);
    response.render(
        new CssUrlReferenceHeaderItem(
            buildURL(
                baseUrl,
                "openlayers3/ol.css",
                null,
                URLMangler.URLType.RESOURCE),
            null,
            null));
    response.render(
        new JavaScriptUrlReferenceHeaderItem(
            buildURL(
                baseUrl,
                "openlayers3/ol.js",
                null,
                URLMangler.URLType.RESOURCE),
            null,
            false,
            "UTF-8",
            null));
  }
});