False positive for java 21 switch case with null, default

[erfri1]

Version

CodeQL CLI: 2.25.6
github/codeql-action: v3
JDK: 21
OS: ubuntu-latest

What happened?

CodeQL Java extraction fails on valid Java 21 switch syntax.

Error:

• Unable to parse source file: .../PrintixService.java
• Parse error at line 84 column 23: Syntax error on token "default", invalid Expression

Then finalize fails with:

• "CodeQL detected code written in Java/Kotlin but could not process any of it."
• exit code 32

Minimal reproducible example

static String f(Object x) {
  return switch (x) {
    case null, default -> "v";
  };
}

[hvitved]

Hi 👋

I can confirm that the Java 21 syntax above is supported, but in QL tests it requires explicitly setting the version. I'll ask internally whether something similar is needed when extracting a real codebase, but I would hope it isn't.

[hvitved]

Could you perhaps elaborate how you created the DB? I was able to successfully extract a DB containing your snipped with codeql database create --build-mode=none --language=java.