Explanation

When upgrading XWiki, you may encounter issues that prevent the application from starting correctly or that affect the upgraded environment.

Common problems after an upgrade include:

• XWiki startup hanging during Solr initialization because existing Solr cores are not configured for delayed loading.
• XWiki failing to start because the servlet container is still running with an unsupported or previous Java version after a required Java upgrade.
• Configuration issues caused by changes in dependencies, servlet containers, or runtime environments.

Before troubleshooting an upgrade issue, check the XWiki and servlet container logs to identify the component causing the failure.

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