Identify Git Commits via Jazz Plain Api

Hello all,

I would like to list all Git commits linked to a work item.
With the following code I'm able to list links to work items as well as links to change sets, but I miss the linked git commits.

ILinkQueryPage workItemLinks2 = linkManager.findLinks(workItemRef, monitor);
            ILinkCollection links2 = workItemLinks2.getAllLinksFromHereOn();
            for(ILink l2 : links2){
                System.out.println("All Links: " + l2.getLinkTypeId() + ", ID: " + l2.getItemId());
            }

What do I have to do to list Git commits?

Many thanks in advance and kind regards,
Christine