"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.

首先，使用多个 Java 项目及其 .vscode/settings.json 文件重现该错误。检查 sourcePaths 设置在引用项目根目录之外的文件夹时是如何进行验证的。当预期的跨项目源路径被接受，并且针对所报告配置具有回归覆盖时，即表示完成。