RSS Portlet problem

To fix the problem shown below... add a xalan.jar to $CATALINA_HOME/common/lib

You'll see the error message below where the RSS feed should be.
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Failed to load portlet org.apache.portals.applications.rss.RSSPortlet: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transformCache' defined in resource loaded through InputStream: Can't resolve reference to bean 'transform' while setting property 'constructor argument with index 0'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transform' defined in resource loaded through InputStream: Instantiation of bean failed; nested exception is org.springframework.beans.FatalBeanException: Could not instantiate class [org.apache.portals.applications.transform.impl.JetspeedTransform]; constructor threw exception; nested exception is javax.xml.transform.TransformerFactoryConfigurationError: Provider org.apache.xalan.processor.TransformerFactoryImpl not found