we got several hundrets of maven builds and for any of them, I cannot save any changes. save button doesn't react, hitting the apply button shows empty error dialog in firefox.

edge chromium doesn't show any reaction.

jenkins log is empty at that time.  I suppose, there isn't any communication between browser and jenkins server, so to my mind it's a html/js issue.. ?

Thanks for updating us. Can you please let us know from which version of Jenkins and Maven Integration Plug-in do you see this issue? And is there any fix provided by Jenkins team so far.

I was experiencing something similar. For the broken maven jobs, UI elements were not in the configuration were not rendering correctly and I was seeing something similar to the console errors from JENKINS-65480 for any of the broken jobs. I removed any of the plugins that weren't rendering. These were all deprecated post-build plugins (Violations, Findbugs, Checkstyle, etc...) that were enabled for a lot of our older maven jobs and that seemed to fix our maven jobs.

We still have some random freestyle jobs that won't save with what looks like a broken slack plugin, but we have other freestyle jobs that render the slack plugin correctly. 

We experienced this issue on the latest LTS with fully updated plugins.

In our case, disabling the Static Analysis Utilities (which required disabling the Checkstyle plugin which had this as a dependency) resulted in the issue being resolved.

I had the same issue. Disabling Checkstyle Plug-in, PMD Plug-in, and Static Analysis Utilities resolved the issue for me.

Remove deprecated sections(from job configuration) and try again.

removing deprecated plugins solved the issue for me

Closed as duplicate of two other issues reported for checkstyle and pmd plugin. Both are deprecated and should be removed per the instructions in the Jenkins 2.277.1 upgrade guide.