<dependency>
    <groupId>com.googlecode.wicked-charts</groupId>
    <artifactId>wicked-charts-wicket6</artifactId>
    <version>1.5.0</version>
  </dependency>

public TestChart(String id, Options options, Theme theme) {
        super(id, options, theme);
    }

    @Override
    protected void onInitialize() {
    // TODO Auto-generated method stub
    super.onInitialize();
    String highcharts   = "https://code.highcharts.com/highcharts.js";
    String exporting    = "https://code.highcharts.com/modules/exporting.js";
    JavaScriptResourceRegistry.getInstance().setHighchartsReference(highcharts);
    JavaScriptResourceRegistry.getInstance().setHighchartsExportingReference(exporting);
}
}