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The wink HTML providers are not enabled by default. In order to activate them there there is a need to register the HtmlSyndEntryProvider and the HtmlSyndFeedProvider providers, located in the org.apache.wink.server.internal.providers.entity.html package.
Since the HTML providers uses jsps for the generation of the representation there is also a need to have the HtmlDefaultRepresentation folder including all it's content and subfolders available for the servlet container, see the way it implements in the QADefect example.
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