Portlet context root - accessing other webapp contexts

[Craig McDonald <Cr...@canberra.edu.au>]

Does anybody know how to reference other tomcat webapp contexts from 
within a portlet?

For example, I have "/webapp1" already installed on tomcat, that serves 
out webpages in a specific way. Then I have a portlet where I want to 
"call" this webapp context within a JSR-168 portlet.

So within my java file I have: PortletRequestDispatcher rd = 
getPortletContext().getRequestDispatcher("/webapp1/view.jsp");

But in this case, the portlet thinks the root is actually at 
"/myportlet/", so calling the above code, it tries to find "view.jsp" at 
"/myportlet/webapp1/" rather than from the "real" tomcat webroot.

Does this make sense? Essentially I need to know how (if possible) I can 
call instances of pages *outside* of the portlet context root.

Any help would be much appreciated.

Cheers,
Craig

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AW: Portlet context root - accessing other webapp contexts

[Sven Thiergen <s....@itcampus.de>]

> Does anybody know how to reference other tomcat webapp contexts
> from within a portlet?

> For example, I have "/webapp1" already installed on tomcat, that serves
> out webpages in a specific way. Then I have a portlet where I want to
> "call" this webapp context within a JSR-168 portlet.

> So within my java file I have: PortletRequestDispatcher rd =
> getPortletContext().getRequestDispatcher("/webapp1/view.jsp");

You probably need to switch the Context to the target tomcat webapp, first.
When programming Servlets you have the option to first get the context (->
the folder under "webapps/") where your servlet runs at:

   ServletContext myContext = getServletConfig().getServletContext();

The from this ServletContext object you can switch to other context's:

   ServletContext otherContext = myContext.getContext("/other");

if the directory structure below "webapps/" e.g. contains the folder
"other/". If it is allowed to switch to a certain context depends on
security constraints (whether a context is marked as "shareable" etc.). At
least I think so, this may not be 100% correct.

Anyway, once you could switch the Context you get a RequestDispatcher to the
desired JSP resource. When working with Portlets you probably need to do
same. Unfortunately I cannot see a comparable method "getContext()" in the
class "PortletContext". Or maybe not unfortunately - this is how the Portlet
API is designed.

Sven.


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