"The source path must be contained in the project root folder"

I'm new to VS Code and now trying to convert an Eclipse project to VS Code.
I have multiple Java projects stored in a common folder.
Each project have its own .vscode/settings.json file.
The projects refer to each other on source level as which requires cross-project references.
The projects are unmanaged using VS Code terminology.

Environment

• Operating System: Mac Sonoma 14.4.1
• JDK version: 21
• Visual Studio Code version: 1.88.1
• Java extension version: 1.29

Steps To Reproduce

1. Try to add a source path from another project in the folder.
   Then you get the error message from the issue.

[Please attach a sample project reproducing the error]
Please attach logs

Current Result

Expected Result

Additional Informations

If this will be addressed, I think "sourcePaths" should permit relative and absolute paths to any folder.

まず、複数の Java プロジェクトとそれぞれの .vscode/settings.json ファイルでエラーを再現します。sourcePaths 設定がプロジェクトルートの外部にあるフォルダーを参照する場合に、どのように検証されるかを確認します。意図したプロジェクト間のソースパスが受け入れられ、報告された構成に対するリグレッションカバレッジが用意されていれば完了です。