Thumbnails not working with DLFileNameHook

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.X EE
• Fix Version/s: 6.2.X EE
• Component/s: Documents & Media
• Labels: None
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Story Points: 6
• Fix Priority: 2
• Git Pull Request: https://github.com/brianchandotcom/liferay-plugins-ee/pull/9602

Thumbnails not working with DLFileNameHook.

Steps
1) Deploy hook
2) Upload image in DL

Expected
Thumbnail is displayed.

Result
ClassCastException and the thumbnail is not displayed.