Start Alfresco Workflow assigned to SiteManager group of a site

start-wf-assigned-to-site-group.js

var ctx = Packages.org.springframework.web.context.ContextLoader.getCurrentWebApplicationContext();
var javaSiteService = ctx.getBean("siteService");
var site = javaSiteService.getSite(document.nodeRef);
var siteManagerGroup = javaSiteService.getSiteRoleGroup(site.getShortName(), "SiteManager", true);
var groupAssignee = people.getGroup(siteManagerGroup)

var workflow = actions.create("start-workflow");
workflow.parameters.workflowName = "activiti$activitiParallelGroupReview";
workflow.parameters.requiredApprovePercent = 20;
workflow.parameters["bpm:workflowDescription"] = "Please review and approve: " + document.name;
workflow.parameters["bpm:groupAssignee"] = groupAssignee;
var futureDate = new Date();
futureDate.setDate(futureDate.getDate() + 7);
workflow.parameters["bpm:workflowDueDate"] = futureDate;
workflow.execute(document);