How to restore a version programmaticaly?

Question

Hi,I want to restore the version programmatically, so went through the PageManager API and found restore method.PageManager pageManager = resourceResolver.adaptTo(PageManager.class);Collection<Revision> revisions = pageManager.getRevisions(currentPage.getPath(), null);                        for(Revision r :revisions){                            currentId=r.getId();                            break;                        }                try{                         pageManager.restore(currentPage.getPath(), currentId);                    }catch(Exception e) The above code snippet restoring the version and crash my page too. Please help me to proceedIt shows NullPointerException exception, The path and Id is not null :(Error Log:28.04.2015 18:54:50.591 *ERROR* [127.0.0.1 [1430227490410] GET /libs/wcm/core/content/pageinfo.json HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught Throwable java.lang.NullPointerException    at com.day.cq.wcm.core.impl.AnnotationsInfoProvider.updatePageInfo(AnnotationsInfoProvider.java:78)    at com.day.cq.wcm.core.impl.servlets.PageInfoServlet.doGet(PageInfoServlet.java:187)    at org.apache.sling.api.servlets.SlingSafeMethodsServlet.mayService(SlingSafeMethodsServlet.java:268)    at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:344)    at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:375)    at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:508)  28.04.2015 18:54:50.669 *ERROR* [127.0.0.1 [1430227490662] GET /content/km/15259/15288.html HTTP/1.1] org.apache.jsp.libs.foundation.components.primary.cq.Page.Page_jsp resource has no content. path=/content/test/15259/15288.html referrer=null

Runal_Trivedi · Accepted Answer

michaelvino86 wrote... for(Revision r :revisions){       currentId=r.getId(); break; }  try{  pageManager.restore(currentPage.getPath(), currentId); }catch(Exception e) When you are using revision to restore, make sure it has content resource (pagecontent) attached with that revision id. Simply make following check before break and see if it solves the problem:Check to make -for(Revision r :revisions){ //selecting version only if it has content attached if(r.hasContent()){ log.info('selected version id - '+r.getId()); currentId=r.getId(); break; } }More on revision API - https://docs.adobe.com/docs/en/cq/5-6-1/javadoc/com/day/cq/wcm/api/Revision.html#hasContent%28%29If above doesn't solve the issue, then can there be a case that page's location has been moved after the version was created, never evaluated what will be the impact of restoring version then.- Runal

joerghoh · Answer

Hi,the only chance I see is that your page does not have a "jcr:content" node. Can you check?kind regards,Jörg

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