Fix for the "cvc-elt.1.a: Cannot Find Declaration of Element 'project' in Maven Projects" error when building with JDKs from 21 and later

[brotenet]

@chabicht
Hello Carsten,

I tried building the project using OpenJDK version "25.0.3" 2026-04-21 and I bumped on the "cvc-elt.1.a: Cannot Find Declaration of Element 'project' in Maven Projects" error that occurs when one tries to build a project in Eclipse with Compliance Level 17 while not having JDK 17 installed. (In my case, only JDK 25 is installed).

The fix I used for this was to remove the POM.XML file from the "com.chabicht.code-intelligence" project and the switch the compliance-level to 21.

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I'm not sure if you would like to implement this change to the project so I'm just attaching a .zip file of the project as I have it now, even though I did not do any other changes to the rest of the project besides deleting the pom.xml and modifying the Eclipse project settings.

code-intelligence_compliance_fix.zip

[chabicht]

You imported the code as a maven project, correct?

I added the Tycho/Maven stuff with the intention to give coding agents a way to build the project and run tests. I never tried building the plugin in Eclipse in that way.
IMO the sane way in Eclipse is to use the "General/Existing Projects into Workspace" route.
I'll have to take a deeper look at this. Looks easy enough to support compliant compilers.