Generified method call shows "cannot convert from Object to boolean" error

Extracted this issue from https://github.com/redhat-developer/vscode-java/issues/3830#issuecomment-2519729457, from @sworthiness

Error:

Type mismatch: cannot convert from Object to boolean Java(16777233)

Environment:

(VS Codium - SSH remote development)

• Version: 1.95.3
• Release: 24321
• Commit: dc5a551c256719475d2d0959270e3836c9bbb632
• Date: 2024-11-16T09:16:49.983Z
• Electron: 32.2.5
• ElectronBuildId: undefined
• Chromium: 128.0.6613.186
• Node.js: 20.18.0
• V8: 12.8.374.38-electron.0
• OS: Windows_NT x64 10.0.19045
• JDK: 17

Steps to reproduce

public class Test {
  public <T> T someMethod() {
    return (T) Boolean.TRUE;
  }

  public void someOtherMethod() {
    if (this.someMethod()) { // Type mismatch: cannot convert from Object to boolean Java(16777233)
    }
  }
}

Current Result

The following compilation error is shown in vs-codium:
Type mismatch: cannot convert from Object to boolean Java(16777233)
The error is not seen if the result of this.someMethod() is stored in a Boolean var first

Expected Result

No compilation error should be seen here

Reproduisez l’extrait Java dans VS Codium avec JDK 17 et examinez le diagnostic produit pour l’appel de méthode générique. C’est terminé lorsque l’utilisation directe de someMethod() dans la condition if ne signale plus d’erreur de conversion, tandis que la reproduction présentée reste couverte par une vérification de régression.