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Java App Engine: "appengine-web.xml does not contain a <threadsafe> element" message

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When I tried to run a Google web app in Eclipse, I got appengine-web.xml does not contain a <threadsafe> element and the app didn't run (well, any new app still does not). It wasn't hard to fix (I just added this element with a true value in the appengine-web.xml file), but I didn't get this error before. What can be a reason of such an unexpected behaviour? Thanks in advance.