Reference to classes with private constructor not resolved

I have a class implementing singleton pattern:

public class SomeSingleton {
  private static SomeSingleton uniqueInstance = null;
  private SomeSingleton() {}
  
  @Synchronized
  public static SomeSingleton getInstance() {
    if (uniqueInstance == null) 
     uniqueInstance = new SomeSingleton();
    return uniqueInstance;
  }

  public void someMethod() {}
}

Any reference to SomeSingleton.getInstance().someMethod() in the editor is underlined in red as error:
SomeSingleton cannot be resolved to a type Java(16777218)

The code build fine with gradle from the command line, without any errors.

My vscode setup:

Version: 1.97.2 (system setup)
Commit: e54c774e0add60467559eb0d1e229c6452cf8447
Date: 2025-02-12T23:20:35.343Z
Electron: 32.2.7
ElectronBuildId: 10982180
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Windows_NT x64 10.0.26100

首先，在 Windows 上使用 singleton 示例和 Gradle 项目于 VS Code 中重现该诊断。将编辑器对 Java 语言服务器的解析与命令行成功构建的结果进行比较。当引用不再显示“SomeSingleton cannot be resolved to a type”，且项目仍能成功构建时，即表示完成。