I have figured it out.Ｗhen I access a page without logging, I see the page as anonymous user, who I think only used on publish. I give it right to read templates and their policies then the bug disappear.If you have the same problem like bugs only on publish, try to check anonymous  at http://xxx.xx...

Since after logging it will show well, I guess a system user to run this statement does not have enough right.  Or should I create a system user myself?

Thank you.I tried to use currentStyle.getDesign().getJSON(); and print it out to check.And I found some pege returns null when I call  currentStyle.getDesign(), at the same time it can return currentStyle.getPath() I need, but page which can return currentStyle.getDesign() always return a null after...

Thank you. It works well when I log in as a admin. But some pages can show without logging in publish mode. 

I am working with a project of aem6.5.I want to read .css and .js from page template policy and use code as:resolver.getResource(currentStyle.getPath()).adaptTo(Packages.javax.jcr.Node);It do well in author, but sometimes currentStyle.getPath()  in publish will return a path starting with "/libs" wh...