Get properties in AEM sling servlet

Usecase: I had a situation to fetch properties from node/page/cloud configurations from sling servlet. 

Issue: In wcmusepojo we can get these cloud configuarations using getInheritedPageProperties(). But inheritedPageProperties variable is not accessible in osgi service or sling servlet.

Solution:
To get properties of a node/page/cloud configurations from sling servlet do the following.

• Pass the node path from ajax to servlet.
• Create a system user to read the properties.

Below is sample servlet code.

/**
* Author: Kishore Polsani
*/
@Component(name = "com.kishore.aem.GetProperties", label = "Get Properties", immediate = true, metatype = true)
@Service
@Properties({ @Property(name = "service.description", value = "Get Properties"),
            @Property(name = "sling.servlet.paths", value = "/services/aemquickstart/getproperties", propertyPrivate = true),
            @Property(name = "service.vendor", value = "AEMQuickstart")
         })
    public class GetProperties extends SlingAllMethodsServlet implements Serializable {
        private static final long serialVersionUID = 1L;
        private Logger log = LoggerFactory.getLogger(GetProperties.class);
        
        @Reference
        protected SlingRepository repository;
        @Reference
        private ResourceResolverFactory resolverFactory;
        
        @Override
        protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException
                    {
                  
            try {
                Map<String, Object> param = new HashMap<String, Object>();  
                param.put(ResourceResolverFactory.SUBSERVICE, "readService");
                ResourceResolver resourceResolver=null;
                resourceResolver = resolverFactory.getServiceResourceResolver(param);
                /* Get this path from ajax call request*/
                Resource pageResource = resourceResolver.getResource("/etc/cloudservices/salesforce/kishore/jcr:content");
                Node configNode = pageResource.adaptTo(Node.class);
                configNode.getProperty("accesstoken");
                log.info("Access token from cloud config"+configNode.getProperty("accesstoken"));
                Session session = resourceResolver.adaptTo(Session.class);
                session.save();
            } catch (AccessDeniedException e) {
                log.error(e.getMessage());
            } catch (PathNotFoundException e) {
                log.error(e.getMessage());
            } catch (ItemExistsException e) {
                log.error(e.getMessage());
            } catch (ReferentialIntegrityException e) {
                log.error(e.getMessage());
            } catch (ConstraintViolationException e) {
                log.error(e.getMessage());
            } catch (InvalidItemStateException e) {
                log.error(e.getMessage());
            } catch (VersionException e) {
                log.error(e.getMessage());
            } catch (LockException e) {
                log.error(e.getMessage());
            } catch (NoSuchNodeTypeException e) {
                log.error(e.getMessage());
            } catch (LoginException e) {
                log.error(e.getMessage());
            } catch (RepositoryException e) {
                log.error(e.getMessage());
            }
        }   
}

Check this post to get properties in different way: Registering a Servlet for every Page in AEM