Access to OSGi framework functionality from a JSP is very simple. The Web Container will prepare the servlet context with the bundle's OSGi bundle context bound to the osgi-bundlecontext attribute.

The Java code can be embedded in the JSP as follows:

<% BundleContext ctx = (BundleContext)
getServletContext().getAttribute("osgi-bundlecontext");

This bundle context is the same that would have been passed to a BundleActivator, if one were defined.

ServiceReference ref =
ctx.getServiceReference(BookshelfService.class.getName());

Getting an instance of the BookshelfService is then straightforward:

BookshelfService bookshelf =
(BookshelfService) ctx.getService(ref);
%>

Alternatively, the code can be moved outside of the JSP, into a JavaBean. We will create a SessionBean, in which will be kept references to session information such as the bookshelf service reference and the session ID.