Using Alfresco's AttributeService with javascript

listAndRemoveSavedAttributes.js

var context = Packages.org.springframework.web.context.ContextLoader.getCurrentWebApplicationContext();
var attributeService = context.getBean("attributeService", Packages.org.alfresco.repo.attributes.AttributeServiceImpl);

attributeService.getAttributes(function(id, value, keys) {
    logger.warn("id: " + id + " - key: " + keys[0] + " - " + keys[1] + " - value: " + value);
	
	if (keys[0] == "project-repo.sequencial.documentos.operacoes") {
		attributeService.removeAttribute([keys[0], keys[1]]);
	}
	
    return true;
}, ["project-repo.sequencial.documentos.operacoes"]);

setAttributeValue.js

var context = Packages.org.springframework.web.context.ContextLoader.getCurrentWebApplicationContext();
var attributeService = context.getBean("attributeService", Packages.org.alfresco.repo.attributes.AttributeServiceImpl);

attributeService.setAttribute([1459], ["project-repo.sequencial.documentos.operacoes", "numero"]);