AEM product import fails with ‘Invalid namespace prefix’ after offline repository compaction

Last update: October 22, 2026

This article explains how to resolve product import failures in Adobe Experience Manager (AEM) caused by missing JCR namespace registration following offline repository compaction.

Description description

Environment

Adobe Experience Manager (AEM)
Offline repository compaction performed

Issue/Symptoms

Product import and save operations fail with errors related to invalid namespace prefixes, such as OakName0001: Invalid namespace prefix: [ namespace] .
The namespace may appear in the AEM UI but is not recognized by the JCR repository during save operations.

Cause

The issue occurs when the JCR repository loses or corrupts the registration for a namespace prefix used in tag creation after offline repository compaction.

Resolution resolution

Follow these steps to resolve the issue:

Review the error logs and confirm the presence of the OakName0001: Invalid namespace prefix error during product import.
Compare the namespace registry in the affected environment with a working environment to verify the expected namespace URI for the missing prefix.
Restart the relevant bundle or application component responsible for tag management. In many implementations, bundle activation triggers automatic re-registration of JCR namespaces.
Review the related service user configuration and, if necessary, clean up and reconfigure it to ensure that it has the correct permissions and setup for tag operations.
Validate the product import process and confirm that the issue is resolved.

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