This was the problem! Thanks!

Was this ever figured out? I'm having the exact same problem - happens when I try to submit from an AEM form to an AEM servlet endpoint, and I did all the correct configuration in CSRF and excluded the path in the authentication manager. All my servlet has in it is an empty "doPost" override.

Hi, I'm just trying to create a live copy of my English language masters site and put it in a /us/en directory, but it's giving me this error: "Can not establish Relation from /content/mysite/language-masters/en -> /content/mysite/us/en/jcr:content: would be circular"   I'm trying to make a live cop...