I upgraded last week a system to Karaf 4.4.1. I have a sporadic problem
with this system.

The system contains a small bundle with this default servlet:

@Component(service = Servlet.class, scope = ServiceScope.PROTOTYPE)
@HttpWhiteboardServletPattern("/")
@HttpWhiteboardContextSelect("(osgi.http.whiteboard.context.path=/)")
public class RootServlet extends HttpServlet {

    @Override
    protected void doGet(final HttpServletRequest req, final
HttpServletResponse resp)
            throws ServletException, IOException {
        resp.sendRedirect("/welcome/welcome.html");
    }
}

However sometimes after the start of Karaf the bundle is active but this
servlet is not available:

de@root()> la -u | grep  web-root
 37 | Active   |  80 | 1.0.0.SNAPSHOT                      |
mvn:de.hierlmeier.testPaxWeb8/web-root/1.0.0-SNAPSHOT

de@root()> ls javax.servlet.Servlet
[javax.servlet.Servlet]
-----------------------
 component.id = 20
 component.name = de.hierlmeier.testPaxWeb8.webRoot.RootServlet
 osgi.ds.satisfying.condition.target = (osgi.condition.id=true)
 osgi.http.whiteboard.context.select = (osgi.http.whiteboard.context.path=/)
 osgi.http.whiteboard.servlet.pattern = [/]
 service.bundleid = 37
 service.id = 206
 service.scope = prototype
Provided by :
  web-root  (37)
Used by:
  web-root  (37)

de@root()> web:servlet-list | grep RootServlet
de@root()>

How can I diagnose this problem?

I am running Karaf 4.4.1 with PAX-WEB 8.0.6 on Java 8.

Regards

  Richard

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