# Nexus 2 to Nexus 3 Artifact Migration

**URL:** <https://community.sonatype.com/t/nexus-2-to-nexus-3-artifact-migration/8583>\
**Category:** Sonatype Nexus Repository\
**Tags:** nexus-repository\
**Created:** [April 27, 2022, 12:40pm UTC](https://community.sonatype.com/t/nexus-2-to-nexus-3-artifact-migration/8583 "2022-04-27T12:40:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ciccio](https://avatars.discourse-cdn.com/v4/letter/c/a9adbd/32.png) [@ciccio](https://community.sonatype.com/u/ciccio)\
**Post date:** [April 27, 2022, 12:40pm UTC](https://community.sonatype.com/t/nexus-2-to-nexus-3-artifact-migration/8583/1 "2022-04-27T12:40:11Z")

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Hi All,

I’m trying to migrate artifacts from Nexus 2 to Nexus 3 and I followed all the checklists and requirements in the docs. Unfortunately I’m getting an error on one specific thing which apparently is not documented:

java.lang.IllegalSteteException: Content selector All\_Maven2 is in use and cannot be deleted.

As far as I know the Nexus 2 instance is not in use as of now and all the other migration steps are completed successfully.

Did anyone of you experienced this error ? Is there a solution to this problem ?

Thanks a lot

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**Author:** ![mbs](https://avatars.discourse-cdn.com/v4/letter/m/6f9a4e/32.png) [@mbs](https://community.sonatype.com/u/mbs)\
**Post date:** [May 20, 2022, 11:32pm UTC](https://community.sonatype.com/t/nexus-2-to-nexus-3-artifact-migration/8583/2 "2022-05-20T23:32:48Z")

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I encountered the same problem. Migrating from 2.15 to 3.38.0-01.

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**Author:** ![mmartz](https://avatars.discourse-cdn.com/v4/letter/m/e9bcb4/32.png) [@mmartz](https://community.sonatype.com/u/mmartz)\
**Post date:** [May 23, 2022, 1:30pm UTC](https://community.sonatype.com/t/nexus-2-to-nexus-3-artifact-migration/8583/3 "2022-05-23T13:30:01Z")

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I found a closed internal ticket indicating that we were never able to reproduce the issue to fix it. One of the comments on the ticket suggested restarting the upgrade to try to work around the problem. See “Restarting an Upgrade” on [Upgrade Procedures](https://help.sonatype.com/display/NXRM3/Upgrade+Procedures).

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**Author:** ![jtom](https://yyz1.discourse-cdn.com/flex047/user_avatar/community.sonatype.com/jtom/32/68_2.png) [@jtom](https://community.sonatype.com/u/jtom)\
**Post date:** [March 15, 2023, 3:22pm UTC](https://community.sonatype.com/t/nexus-2-to-nexus-3-artifact-migration/8583/4 "2023-03-15T15:22:56Z")

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I believe that link on restart is now [Resetting a Nexus Repository 2 to 3 Upgrade](https://help.sonatype.com/repomanager3/installation-and-upgrades/upgrading-from-nexus-repository-manager-2/nexus-repository-3-upgrade-wizard/resetting-a-nexus-repository-2-to-3-upgrade)