Cannot resolve symbol 'jdbc'
已回答
IntelliJ's inspection is complaining about symbols in xml files, which cannot be resolved.
Why are `jdbc`, `h2`, `java` and `comp` identified as symbols and how do I resolve them?
Thanks
context.xml:

jackrabbit-h2.xml:

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Can't reproduce. Did you inject some language in the string?
Try Alt+Enter, Uninject from the context menu.
~~accidentally clicked 'disable language injection' in the context menu. Now that entry is gone. Can't find it in the settings. How do I enable that entry in the context menu again?~~
It's called Intention Action
https://www.jetbrains.com/help/idea/2020.2/intention-actions.html
See https://www.jetbrains.com/help/idea/using-language-injections.html .
Thanks Serge for your replies.
Though I seem not to have any language injected.
What is the file type mapping for this file?
Can you share a sample project to reproduce the issue at https://uploads.jetbrains.com?
Thanks for your reply. Support Issue:
https://youtrack.jetbrains.com/issue/IDEA-270281
File type association: