Before I comment over the capabilities of our product for generating Bookmarks in large PDF documents, we need to deeply analyze this scenario. Please spare us little time as we need to test this scenario and will get back to you shortly. We are sorry for your inconvenience.
I have tested the scenario in details and as per my observations, the BookMark feature is failing when PDF document is greater than 195 pages (196 or above). The BookMark feature is working fine till 195 pages. For the sake of correction, I have logged this problem as PDFJAVA-26955 in our issue tracking system. We will further look into the details of this problem and will keep you updated on the status of correction. We apologize for your inconvenience.
PS, The problem is occurring irrespective of data volume because I have provided simple text string and I am able to see this issue.