A java application process running on weblogic server was reported to have some stuck threads in the past.
Can we get information on those stuck threads from a past time?
No, you can't. Gone is gone, end of story.
The only thing you can do is to figure if you can somehow detect such situations while they occur to then collect thread dumps and to log the results.
Worst case you have to give the customers/operators clear instructions how to gather dumps themselves to make them available to you.