ClassCastException during staging publishing when a category is assigned to a DLFolder

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.10 EE GA1, 6.2.X EE
• Fix Version/s: 6.2.X EE
• Component/s: Categories, Documents & Media, Documents & Media > Administration, Staging > Export/Import
• Labels:
  • 62-ee-sp20
  • ee-ts
  • liferay-fixpack-portal-154-6210
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Story Points: 1.25
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal-ee/pull/17644

1. Create a Document Library Folder and a Category in the default site
2. Query the dlfolder, assetcategory and user_ database tables, and note the folderId, categoryId and userId values of your folder, category and admin user
3. Replace <YOUR_CATEGORY_ID>, <YOUR_FOLDER_ID> and <YOUR_USER_ID> with the actual folderId, categoryId and userId values respectively in the attached Groovy script
4. Run the Groovy script on Control Panel > Server Administration > Script (All this is needed because it's not possible to assign a category to a folder through the UI)
5. Turn on local staging on the site
6. Publish to live by making sure Categories are selected to be published

Result: The publish will fail with ClassCastException

com.liferay.portal.kernel.exception.SystemException: java.lang.ClassCastException: com.liferay.portlet.documentlibrary.model.impl.DLFolderImpl cannot be cast to com.liferay.portal.kernel.repository.model.Folder

It looks to be the same issue as LPS-62149 but for folders. The solution can also use the same pattern.

Master is not affected, because AssetCategories got their own StagedModelDataHandler and the affected code was deleted by LPS-41340