java.io.IOException: classFile.delete() failed

Is this happening only in production instances?, are you able to replicate this issue in lower environment.

Please raise a Support ticket with AMS (adobe managed services) to check with their engineering team.

I had this problem on one of our onPrem publish environments before, like back in 2021

We found out that it was related to AEM’s Java class generation (e.g., scripts, components, or HTL templates compiled to Java files). When these class files cannot be deleted properly, it may cause errors, especially under high traffic or during deployments.

How we solved it:

• Check Error Logs for Compilation Errors: Investigate the logs further to identify whether specific components or scripts failed to compile and generate the class files.

  Look for issues related to HTL (HTML Template Language) or JSP files.

• Clear Sling Cache: AEM caches compiled scripts and components, and sometimes clearing this cache can resolve the issue.

  •  You can manually clear the Sling Script Cache by navigating to:
    /system/console/slingjsp
  • Click on "Clear JSP Script Cache" to force recompilation of the files.

  • Check the Temporary Directory: Look into the AEM temporary directory (/tmp/aem-cache, /crx-quickstart/tmp, etc.) for any issues with leftover files or a full directory.

It was not 100% understandable for why this happened, but we decided to update the latest AEM service pack, and this problem did not surface anymore.

Is this AEM 6.5 SP21?

@akhilraj Did you find the suggestions helpful? Please let us know if you require more information. Otherwise, please mark the answer as correct for posterity. If you've discovered a solution yourself, we would appreciate it if you could share it with the community. Thank you!