Open Source Document Management System | OpenKM

HELLO,
Actually in openkm how we can change version from backend in java and that changed version we can see on openkm frontend.(this is the task )
ex .suppose i am uploading same document which is already present in openkm and i want to upload same document again then we have to change the version this happens from frontend of openkm but i want to do from backend by using java.
as per my knowledge ,before that i want to get the file name which is uploaded in openkm .
suppose we get the file name which is uploaded in openkm then by using that file name can we change version?
thanks
swati

Hello,
can you give workflow of openkm means suppose we create folder ->in that folder we upload documents and if same documents uploaded then how the workflow happen(for change version of documents i.e. how the rest call going from which class to which class.)
thanks
swati

I do not follow the explanation about uploading a document that already exists in the repository and the workflow.