I've just reproduced the issue when upgrading XWiki 12.6.8 to 17.4.2 (MariaDB 11.8/ Tomcat 11).
This will be true for any XWiki upgrade from version older than 16.x, because there a supported by strategy has been introduced.
Nikita Petrenko on 21/Jul/25 18:23
{quote}I've just reproduced the issue when upgrading XWiki 12.6.8 to 17.4.2 (MariaDB 11.8/ Tomcat 11).{quote}
This will be true for any XWiki upgrade from version older than 17.x or 16.x, because there a supported by strategy has been introduced.
Nikita Petrenko on 21/Jul/25 18:27
{quote}I've just reproduced the issue when upgrading XWiki 12.6.8 to 17.4.2 (MariaDB 11.8/ Tomcat 11).{quote}
This will be true for any XWiki upgrade from version older than 17.x or 16.x.
{code:java} 2025-07-21 19:24:14,038 [qtp1486566962-48 - http://laptop-0t4ck53s:8080/xwiki/bin/distribution/XWiki/Distribution?xredirect=%2Fxwiki%2Fbin%2Fview%2FMain%2F&action=COMPLETE_STEP] WARN .x.e.i.i.DefaultExtensionIndex - Failed to get the extension [org.xwiki.platform:xwiki-platform-distribution-flavor-mainwiki/17.4.2] from the index: NullPointerException: Cannot invoke "String.equals(Object)" because "repositoryId" is null {code}
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