Since nuxeo 5.5 we're detecting you're using a core session inside a container without a transaction active.
If you've got these warns you should check if this is an unwanted behavior or not. One source of this problem can be your way of writing the http response in your servlet. By default, when you've configured the request controller filter's transactional mode on your URL, the transaction is committed when you're adding an header or writing content into the response.
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