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https://issues.apache.org/jira/browse/SLING-11677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17637186#comment-17637186
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Carsten Ziegeler commented on SLING-11677:
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Sling does not know what else is deployed, guessing does not make sense. For
example, the Sling context might be configured to a different path than the
root, or the other default context might appear later than then Sling engine
etc. There are so many different ways to configure the system, that we should
not go into this territory. We can clearly document what you need to do if you
use the default setup.
> Sling Engine Context 'org.apache.sling' has higher ranking than 'default'
> context
> ---------------------------------------------------------------------------------
>
> Key: SLING-11677
> URL: https://issues.apache.org/jira/browse/SLING-11677
> Project: Sling
> Issue Type: Bug
> Components: Engine
> Reporter: Konrad Windszus
> Assignee: Konrad Windszus
> Priority: Major
> Attachments: HTTP-Service-Default-Context.png, Servlet-Contexts.png
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When a servlet is registered with the OSGi HTTP Whiteboard pattern without
> the property {{osgi.http.whiteboard.context.select}} the "default" context
> helper is used
> (https://docs.osgi.org/specification/osgi.cmpn/7.0.0/service.http.whiteboard.html#service.http.whiteboard.common.properties)
> With the Jetty Implementation from Felix in Sling this has the
> {{service.ranking}} {{Integer.MIN_VALUE}}
> (https://github.com/apache/felix-dev/blob/e7d17aca517949dd65a913f9ac5088e653a4a2dc/http/base/src/main/java/org/apache/felix/http/base/internal/whiteboard/WhiteboardManager.java#L182)
> while the one for the default Sling Main Servlet has no explicit ranking
> (i.e. 0). That leads to the fact that the Sling Main servlet always takes
> precedence as
> {quote}
> In the case of two Servlet Context Helpers with the same path, the service
> with the highest ranking is searched first for a match. In the case of a tie,
> the lowest service ID is searched first.
> {quote}
> (https://docs.osgi.org/specification/osgi.cmpn/7.0.0/service.http.whiteboard.html#service.http.whiteboard.servletcontext)
> as both "default" and "org.apache.sling" are registered for path "<root>".
> The Sling Main servlet context should use a lower ranking so that simple
> servlets registered via OSGI HTTP Whiteboard pattern without explicit context
> can kick in at all!
> Attached the web console of Sling Starter 12:
> !Servlet-Contexts.png!
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