It looks like the language server has issues refreshing live data from Spring Boot 3 applications somehow. Here is what I did (in Eclipse):

• fresh install, fresh workspace, new Rest Service guide complete project, added actuators to the project
• open the GreetingController java source file
• start the project from the boot dashboard

The live hovers show up nicely and correct, but nevertheless the language server shows progress that it tries to refresh live data via several attempts - and shows the failure message at the end of all the retries.

This seem to happen in 4.17.2 as well, but it doesn't seem to happen every single time. Up to now, I haven't figured out the exact circumstances that trigger this behavior though.