java.lang.IllegalStateException : Failed to initialize a GAE background thread factory

Question

当我尝试让 firebase 数据库引用时出现此错误。

java.lang.IllegalStateException:无法初始化 GAE 后台线程工厂

如果我获取的数据库引用不正确，请告诉我。

提前致谢。

try {
        FileInputStream serviceAccount = new FileInputStream("abcd.json");

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

        FirebaseApp.initializeApp(options);


    } catch (FileNotFoundException e) {
         System.out.println("ERROR: FileNotFoundException :invalid service account credentials. See README.");
         System.out.println(e.getMessage());

    } catch (IOException e) {
        System.out.println("ERROR: IOException : invalid service account credentials. See README.");
        System.out.println(e.getMessage());
    }

    DatabaseReference defaultDBRef = FirebaseDatabase.getInstance().getReference();

Answer 1

尝试使用手动扩展(检查您的免费配额!)。 firebase-admin-sdk 在处理线程时存在问题。

文档状态:

We recommend that even Java backends use the REST API for Firebase, due to known issues with restarting App Engine threads running the Firebase Java SDK.

请参见此处:https://cloud.google.com/solutions/using-firebase-real-time-events-app-engine