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Published Jun. 30, 2025

Suggestion for troubleshooting/debugging document preview generation problems

Written By

Sorin Pop

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Issue

  • Document previews do not seem to be generated, we keep seeing the "Generating preview will take a few minutes" message. No errors in the logs.
  • How can I troubleshoot or get more logs about what is happening during preview generation, what could go wrong?

Environment

  • 7.4

Resolution

  • In Control Panel/Server Administration/Logs, raise the log level to DEBUG for the following entries:

com.liferay.portal.util.FileImpl
com.liferay.document.library
com.liferay.portlet.documentlibrary
com.liferay.portal.store
com.liferay.adaptive.media

 

and then test again and check the logs. (You might also want to reset preview and thumbnails fro existing documents: see https://help.liferay.com/hc/en-us/articles/360018669451-What-is-the-significance-of-Reset-preview-and-thumbnail-file-for-Documents-and-Media-option-)

 

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