Has someone managed to configure modeshape 5.1 to be compliance with CMIS 1.1?
According to documentation modeshape supports CMIS 1.1 repository but when you try to get repository info, you will get the answer 1.0.
I asked in Modeshape forum, but they did not give me an answer if they had tested whether modeshape 5.1 is working with CMIS 1.1 or not.
As they told me, they just implement CMIS 1.1 but do not test whether it works or not, disappointing.
Is there any other open source product that implements CMIS and JCR 1.1?
Regarding ModeShape, I am not that familiar with the product, but according to this page, there are multiple end points for both CMIS 1.0 and CMIS 1.1. Maybe you are using the 1.0 end point when you instead should be using the 1.1 end point.
As to your other question, Alfresco and Nuxeo both are open source and implement CMIS 1.1. I do not know the status of either product's JCR compliance because, at least with Alfresco, no one uses JCR any more. Plus, if you are using CMIS you should not need JCR.