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Integrate Google Charts API (v45) with wicket. The API tries not to hide all details of the Google API, but makes use of the JSON lib of wicket to mix Java, JavaScript and JSON in a transparent way..

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/* 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.wicketstuff.gchart;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import static org.wicketstuff.gchart.Chart.LOADER_URL;

/**
 *
 * @author Dieter Tremel
 */
public class GoogleChartBehavior extends Behavior {

    private static final long serialVersionUID = 6022115409129348109L;

    private final Chart chart;
    private final String divId;

    public GoogleChartBehavior(Chart chart, String divId) {
        this.chart = chart;
        this.divId = divId;
    }

    @Override
    public void renderHead(Component component, IHeaderResponse response) {
        super.renderHead(component, response);
        // TODO ist this rendering sufficient for refreshing chart by AJAX?
        response.render(JavaScriptHeaderItem.forReference(
                component.getApplication().getJavaScriptLibrarySettings().getJQueryReference()));
        response.render(JavaScriptHeaderItem.forUrl(LOADER_URL));
        response.render(JavaScriptHeaderItem.forScript(chart.toJavaScript(), chart.getScriptId()));
        if (chart.isResponsive()) {
            response.render(JavaScriptHeaderItem.forScript(chart.createRedrawJavaScript(), chart.getRedrawScriptId()));
        }
    }

}