OneDrive query returns empty array

Question

I am currently working on a solution that is accessing OneDrive in Office 365 using Microsoft Graph. I am using the adal4j library to handle authentication and have configured the app in portal.azure.com.

My question relates the call to get the children for a specified drive. I am using a query similar to the one shown below, as I want to get folders and files at the root level of a specified users drive:

https://graph.microsoft.com/v1.0/users/*user id*/drives/*drive id*/root/children

When I login to the Graph Explorer and execute the query, I get a json result showing the root folder contents for the drive and user specified. All works as expected.

When I call it from my java application, the JSON node value is empty ([]).

Initially my thought was, because the Graph Explorer uses a different app id in the portal it was possibly something to do with access rights. However, I successfully read user profiles in our O365 tenant, the drive id's for each user, and if I execute the following:

https://graph.microsoft.com/v1.0/users/*user id*/drives/*drive id*/root/search(q='')

It provides me a complete list of all of the folders, sub folders etc within the appropriate user's drive.

Therefore, making me think this is a bug with the Graph query I am attempting to use rather than an authorization issue, but, that wouldn't explain why it works in the Graph Explorer.

The same java method is used for all calls, and the url is passed in as a parameter.

Answer 1

Just to follow up, the azure portal app permissions has the capability of adding permissions for the graph api. This was, indeed the problem. It would appear that the search was ignoring the permission and successfully reading the data whereas the /children call was honouring the security model. This caused a lot of confusion, but is now resolved.

Thanks Marc for your help.