How can I extract the "link" attribute from a EducationSubmissionResource in java?

Question

My students submit github pr's. I want to extract those in java. I can see the "link" attribute when i look at the submission in GraphExplorer with the request
https://graph.microsoft.com/v1.0/education/classes/{id}/assignments/{id}/submissions/{id}/submittedresources.

Here's an image of what i see in Graph Explorer:

However, when I use the java Graph API, I can't seem to get the "link" attribute:

As you can see, "link" is red, because it doesn't exist. In stead I can use "displayName".
The display name is the same as the "link" by default, but students do have the option to give a custom "displayName" when they hand in their assignment (github link) in teams:

So, getting the "displayName" will work in some cases, but it's risky.

Is there any way to get the actual "link" attribute in my java application?

Answer 1

I solved it myself.
You can cast the EducationResource to an EducationLinkResource