Problem with installing MCP Server 0.9 on XWiki 17.4.4

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1

Hello, friends, I need help!
I’m trying to install MCP Server (Core + UI) version 0.9 via Extension Manager. When I try to install, I get the error:
“This version is not compatible with your installation.”

Other extensions from the LLM App suite install without errors. The following are installed:

  • LLM Application (BETA) v.0.8
  • Index for the LLM Application (BETA) v.0.9
  • LLM Models API (BETA) v.0.8
  • LLM Index API (BETA) v.0.8
  • LLM Internal Inference Server (BETA) v.0.9
  • Token-based authentication for the LLM Application (BETA) v.0.9
    After installation, I restarted the XWiki server.

XWiki version is 17.4.4. MCP Server version is 0.9

Error in the installation log:
*Dependency [org.reactivestreams:reactive-streams-1.0.4] is not compatible with core extension feature [org.reactivestreams:reactive-streams/1.0.3] ([org.reactivestreams:reactive-streams/1.0.3])
*

2026-07-22_12-29-34
2026-07-22_12-29-341115×651 66.6 KB

Could you tell me how to solve this problem?

2

Probably a bug in the dependency management, we do we have some excludes to avoid exactly this problem, but apparently it’s not working. Feel free to report this at https://jira.xwiki.org in the LLMAI project.

In general, I would recommend updating XWiki to a supported version that receives security fixes, so 17.10.10 at the moment which shouldn’t have this problem as it includes reactive-streams 1.0.4.

1 Like
3

Thank you for advice, Michael, I’ll try on 17.10.10 version