How does Apache Sling script resolving rules work?

Question

I have page with name tst in content whose

sling:resourceType = news-portal/pages/test

page structure (under the /apps):

test has

sling:resourceSuperType = news-portal/pages/news-repo-main-page

in browser I type following URL:

http://localhost:4502/cf#/content/tst.selector.pdf.html

after this request I see content of selector.jsp

But I expected to see content of selector.pdf.jsp because it has more suitable much according my opinion.

1. Can you explain how it works?

2. Is there URL which can show content of selector.pdf.jsp ?

3. Does the choice of content affects if test had sling:resourceType instead of sling:resourceSuperType or together? (I try to test but don't see affection)

P.S.

I know that answer somewhere here:

But I have problems with understanding

P.S.

log resolving:

      0 (2014-03-28 13:18:31) TIMER_START{Request Processing}
      0 (2014-03-28 13:18:31) COMMENT timer_end format is {<elapsed msec>,<timer name>} <optional message>
      0 (2014-03-28 13:18:31) LOG Method=GET, PathInfo=/content/tst.selector.pdf.html
      0 (2014-03-28 13:18:31) TIMER_START{ResourceResolution}
      0 (2014-03-28 13:18:31) TIMER_END{0,ResourceResolution} URI=/content/tst.selector.pdf.html resolves to Resource=JcrNodeResource, type=cq:Page, superType=null, path=/content/tst
      0 (2014-03-28 13:18:31) LOG Resource Path Info: SlingRequestPathInfo: path='/content/tst', selectorString='selector.pdf', extension='html', suffix='null'
      0 (2014-03-28 13:18:31) TIMER_START{ServletResolution}
      0 (2014-03-28 13:18:31) TIMER_START{resolveServlet(JcrNodeResource, type=cq:Page, superType=null, path=/content/tst)}
      0 (2014-03-28 13:18:31) TIMER_END{0,resolveServlet(JcrNodeResource, type=cq:Page, superType=null, path=/content/tst)} Using servlet /libs/foundation/components/primary/cq/Page/Page.jsp
      0 (2014-03-28 13:18:31) TIMER_END{0,ServletResolution} URI=/content/tst.selector.pdf.html handled by Servlet=/libs/foundation/components/primary/cq/Page/Page.jsp
      0 (2014-03-28 13:18:31) LOG Applying Requestfilters
      0 (2014-03-28 13:18:31) LOG Calling filter: org.apache.sling.bgservlets.impl.BackgroundServletStarterFilter
      0 (2014-03-28 13:18:31) LOG Calling filter: org.apache.sling.rewriter.impl.RewriterFilter
      0 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.core.impl.WCMRequestFilter
      0 (2014-03-28 13:18:31) LOG Calling filter: org.apache.sling.i18n.impl.I18NFilter
      0 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.theme.impl.ThemeResolverFilter
      0 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.foundation.forms.impl.FormsHandlingServlet
      1 (2014-03-28 13:18:31) LOG Calling filter: org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter
      1 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.mobile.core.impl.redirect.RedirectFilter
      1 (2014-03-28 13:18:31) LOG RedirectFilter did not redirect (MobileUtil.isMobileResource() returns false)
      1 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.core.impl.warp.TimeWarpFilter
      1 (2014-03-28 13:18:31) LOG Applying Componentfilters
      1 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.core.impl.WCMComponentFilter
      1 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.core.impl.WCMDebugFilter
      1 (2014-03-28 13:18:31) TIMER_START{/libs/foundation/components/primary/cq/Page/Page.jsp#0}
      1 (2014-03-28 13:18:31) LOG Including resource JcrNodeResource, type=news-portal/pages/test, superType=null, path=/content/tst/jcr:content (SlingRequestPathInfo: path='/content/tst/jcr:content', selectorString='selector.pdf', extension='html', suffix='null')
      1 (2014-03-28 13:18:31) TIMER_START{resolveServlet(JcrNodeResource, type=news-portal/pages/test, superType=null, path=/content/tst/jcr:content)}
      1 (2014-03-28 13:18:31) TIMER_END{0,resolveServlet(JcrNodeResource, type=news-portal/pages/test, superType=null, path=/content/tst/jcr:content)} Using servlet /apps/news-portal/pages/news-repo-main-page/selector.jsp
      1 (2014-03-28 13:18:31) LOG Applying Includefilters
      1 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.core.impl.WCMComponentFilter
      1 (2014-03-28 13:18:31) LOG Calling filter: com.day.cq.wcm.core.impl.WCMDebugFilter
      1 (2014-03-28 13:18:31) TIMER_START{/apps/news-portal/pages/news-repo-main-page/selector.jsp#1}
      2 (2014-03-28 13:18:31) LOG Found processor for post processing ProcessorConfiguration: {contentTypes=[text/html],order=-1, active=true, valid=true, processErrorResponse=true, pipeline=(generator=Config(type=htmlparser, config={}), transformers=(Config(type=linkchecker, config={}), Config(type=mobile, config=org.apache.sling.jcr.resource.JcrPropertyMap@25c0b221), Config(type=mobiledebug, config=org.apache.sling.jcr.resource.JcrPropertyMap@deea7e4), Config(type=contentsync, config=org.apache.sling.jcr.resource.JcrPropertyMap@2f5070e1), serializer=Config(type=htmlwriter, config={}))}
      2 (2014-03-28 13:18:31) TIMER_END{1,/apps/news-portal/pages/news-repo-main-page/selector.jsp#1}
      2 (2014-03-28 13:18:31) TIMER_END{1,/libs/foundation/components/primary/cq/Page/Page.jsp#0}
      2 (2014-03-28 13:18:31) TIMER_END{2,Request Processing} Request Processing

UPDATE

I noticed that if I create following structure and send request to

http://localhost:4502/cf#/content/tst.selector.pdf.html

I see content of pdf.jsp

Answer 1

In Sling there are two things: content (stored under /content) and code (stored under /apps). Content contains only properties data. There should be no logic, no JSP (or any other code) and selector information under /content.

On the other hand, /apps subtree contains scripts used to render the content. Such scripts are usually called components. sling:resourceType property (set for a piece of data, under /content) is a link between content and component. This is the way how content may say "following component should be used to display me".

sling:resourceSuperType has a different function. It is a property set on the component resource (under /apps), used to mark that this component should inherit JSPs and from another one. This property allows to create component hierarchy.

According to link in the comment it is also possible to put sling:resourceSuperType in the data component under /content. In this case, we force the component referenced in sling:resourceType to inherit from component referenced in sling:resourceSuperType. I don't know any use-case for that, tough.

In your case, please try creating following structure:

• /content/test
  • sling:resourceType = news-portal/pages/test
• /apps/news-portal/pages/test
  • component main resource, no special properties
• /apps/news-portal/pages/test/test.jsp
  • main JSP file
• /apps/news-portal/pages/test/selector.jsp
  • JSP used for selector
• /apps/news-portal/pages/test/selector/pdf.jsp
  • selector + pdf extension