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David Chandler's Journal of Java Web and Mobile Development

  • David M. Chandler


    Web app developer since 1994 and former Developer Advocate with Google now residing in Colorado. Besides tech, I enjoy landscape photography and share my work at ColoradoPhoto.gallery.

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Using Tomahawk Tree2 Component in a Portal

Posted by David Chandler on September 25, 2006

To run Tree2 with client-side expansion, you need JavaScript in the page <HEAD>. Normally, this gets added by the Tomahawk ExtensionsFilter. This doesn’t work in a portal, however, because servlet filters don’t run in a portal. There are some patches in MYFACES-434 (portlet filter) you may be able to use, but here’s an easier workaround. I’ve used this successfully with Tomahawk 1.1.3 in both Jetspeed2 and Liferay.

First, use Tree2 with server-side expansion so as not to require JavaScript. The ExtensionsFilter is therefore needed only to serve up the image resources needed by Tree2, and image requests are handled through the Faces Servlet, not the portal, so the ExtensionsFilter will run as normal for these requests. However, Tomahawk 1.1.3 checks to see if the ExtensionsFilter has been configured, which fails in the portal context. Fortunately, you can disable the check with a web.xml context param.

So to summarize, you can use Tree2 1.1.3 in a portal without any of the MYFACES-434 patches if

  1. You use server-side toggle
  2. You configure ExtensionsFilter as normal for the Faces Servlet
  3. You disable the ExtensionsFilter configuration check as follows in web.xml:
    <context-param> 
         <param-name>org.apache.myfaces.CHECK_EXTENSIONS_FILTER</param-name> 
         <param-value>false</param-value> 
     </context-param>

/dmc

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