vscode diagnosis problems issue after clean java language server workspace problems

Environment

• Operating System: win11 & macOS 15
• JDK version: JDK 17
• Language Support for Java(TM) by Red Hat :v1.4x.x (v.1.40-v.1.42 also)

While developing Java in VS Code, I occasionally run into resolution issues. I used to resolve them by executing the "Clean Java Language Server Workspace" command. However, I've recently observed that after using this command and restarting VS Code, the diagnostics (errors, warnings, infos) count always resets to 0.

Furthermore, diagnostics appear to only analyze files that are currently open in the editor. As a result, if a change breaks a reference in another file that isn’t opened, no error is shown—unless the affected file is explicitly opened.

The only workaround I’ve found so far is to clone the project into a new directory. Cloning into the same original path doesn't solve the issue, and clearing cache has no effect either.

まず、Java プロジェクトで "Clean Java Language Server Workspace" コマンドを使用し、報告された Windows および macOS 環境の VS Code で問題を再現します。再起動後に診断が消えるかどうか、また開いていないファイルが解析されるかどうかを確認します。各対象ファイルを開かなくても診断が引き続き利用でき、壊れた参照が報告されれば完了です。