Spring Roo projects and project facets

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Error configuring application listener of class org.springframework.web.context.ContextLoaderListe ner
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListe ner
...
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Effectively I could not start any webapp any more.

When I had this problem I opened the project properties and checked Spring > Dependency Management --> "Automatically update dependencies..." and rebuilt the project. I think I also made sure that "Maven dependencies" was part of "Web Deployment Assembly".
That said some fresh roo projects ran even without these checked, but nevertheless those settings worked with those that didn't run because of the ClassNotFoundException.