Hi @Sasik

Please find the one below. It may be helpful for you,

HashStringMapactivityKeys = new HashStringMap();
activityKeys.putString(“pxObjClass”, “Rule-Obj-Activity”);
activityKeys.putString(“pyClassName”, workclass);
activityKeys.putString(“pyActivityName”, “HistoryAndAttachments” );
tools.doActivity(activityKeys , workpage, tools.getParameterPage() );

Thanks 

Vishnu