[news.eclipse.platform] markerImageProviders extension point

["Bruce Trask" <bruce.trask@xxxxxxxxxxxxx>]

Hello I am using Eclipse 3.2 Callisto.

I am coding up the example in the book "Contributing to Eclipse"

Specifically:
   <extension
         id="failure"
         name="&quot;Test Failure&quot;"
         point="org.eclipse.core.resources.markers">
         <super type="org.eclipse.jdt.core.problem"/>
      <persistent value="true"/>
   </extension>
   <extension point="org.eclipse.ui.ide.markerImageProviders">
  <imageprovider markertype="org.eclipse.contribution.junit.failure"
       icon="icons/testerr.gif"
       id="org.contribution.junit">
  </extension>

whereby I should be able to create a new icon in the vertical ruler for my 
marker.

My new icon is not being used.  I have searched around and see that there 
might be some problems with the
markerImageProvider extension point.  Can someone confirm this or point out 
what I might be doing wrong?

Thanks.

Regards,
Bruce