google应用程序引擎Firebase Java管理SDK错误

Question

我正在尝试验证用户的ID令牌。无论何时调用verifyIdToken函数，都会引发以下错误：

java.lang.IllegalArgumentException: projectId must be set

以下是servlet代码：

public class GeneratorInfoServlet extends HttpServlet {
    FirebaseApp app = null;

    @Override
    public void init(ServletConfig config) {
        InputStream serviceAccount = Thread.currentThread().getContextClassLoader()
                .getResourceAsStream("/WEB-INF/service_key.json");

        FirebaseOptions options = new FirebaseOptions.Builder()
                .setCredential(FirebaseCredentials.fromCertificate(serviceAccount))
                .setDatabaseUrl("https://project-id.firebaseio.com/")
                .build();

        this.app = FirebaseApp.initializeApp(options);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter out = resp.getWriter();
        StringBuffer tokenBuffer = new StringBuffer();
        String line;

        try {
            BufferedReader reader = req.getReader();
            while ((line = reader.readLine()) != null)
                tokenBuffer.append(line);

            this.verifyToken(tokenBuffer.toString());
            out.print("{'success': false}");
        } catch (Exception e) {
            System.err.print(e);
            out.print("{'success': true}");
        }
    }

    private void verifyToken(String idToken) {
        System.out.println(app);
        FirebaseAuth.getInstance(this.app).verifyIdToken(idToken)
                .addOnSuccessListener(decodedToken -> {
                    String uid = decodedToken.getUid();
                    System.out.println(uid);
                }).addOnFailureListener(e -> System.out.println(e));
    }
}

我查阅了文档，但没有找到直接设置项目id的方法。然而，我认为它一开始就没有必要，因为它已经写在服务密钥和数据库url中了

谢谢

编辑：

常规Java SDK（非管理员）在FirebaseOptions builder中内置了setApplicationId（“项目ID”）函数。但是，在AdminSDK中没有这样的选项

Answer 1

我正在初始化我的Firebase应用程序，有点不同，请参阅我的代码

InputStream in = Thread.currentThread().getContextClassLoader()
                .getResourceAsStream("/WEB-INF/service_key.json");

FirebaseOptions options = new FirebaseOptions.Builder()
                    .setServiceAccount(in)
                    .setDatabaseUrl(".....")
                    .build();

这对我来说适用于AdminSDK版本4.0.4