How can I invoke WCMuse java class from JAVASCRIPT Use api

I have a wcmuse class which works fine with data-sly-use.
Now I want to invoke this class and its methods from Sightly Javascript-use api.

I want to do some extra work hence i need to have data-sly-use functionality in javascript.

Please help.

When I try this code in JS its getting instantiated but the activate method is not invoked :

use(function () {

    var articleList = new Packages.com.xxx.cq.unifiedweb.core.sightly.DocumentationPageHelper;

    var list = articleList.getRecommendedList();

    // you can reference the parameters via the this keyword.

    var retValue = this.value1 + this.seperator + this.value2;

    return {

        newValue: retValue

    };

});

Java class :

public class DocumentationPageHelper extends WCMUse {

@Override

public void activate() throws Exception {

SlingScriptHelper slingScriptHelper = getSlingScriptHelper();

/** Do something **/

}

}