Getting collaborators of a Folder through Java API

Hi,

So I am trying to get collaborators and their permissions on box files and folders using Java API.

To get permission of a certain file, I did

file.getAllFileCollaborations

and then for each collaboration `col` I did

col.getAccessibleBy, col.getRole

and it works totally fine. But when I try to do the exact same thing for folder, using

folder.getCollaborations

and then for every collaboration col if I do

col.getAccessibleBy.getName

It throws this exception:

java.lang.NullPointerException

What am I doing wrong? Here I must tell you that I am not the owner of this folder, but I can access it as I am a collaborator.

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