使用firebase admin sdk和java将我的后端服务器连接到firestore。
这是我进行firebase设置的初始化方法

public void initialize() throws IOException {
        FileInputStream serviceAccount = new FileInputStream(GOOGLE_APPLICATION_CREDENTIALS);
        GoogleCredentials credentials = GoogleCredentials.fromStream(serviceAccount);
        FirebaseOptions options = new FirebaseOptions.Builder()
                .setCredentials(credentials)
                .build();
        FirebaseApp.initializeApp(options);

    }

当我使用cloudfirestore运行时，我的项目运行得很好，但是当我尝试通过添加环境变量firestore\u emulator\u host来使用firestore local emulator运行时，我遇到了以下问题

Caused by: com.google.api.gax.rpc.UnauthenticatedException: io.grpc.StatusRuntimeException: UNAUTHENTICATED: Credentials require channel with PRIVACY_AND_INTEGRITY security level. Observed security level: NONE
    at com.google.api.gax.rpc.ApiExceptionFactory.createException(ApiExceptionFactory.java:73)
    at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:72)
    at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:60)
    at com.google.api.gax.grpc.ExceptionResponseObserver.onErrorImpl(ExceptionResponseObserver.java:82)
    at com.google.api.gax.rpc.StateCheckingResponseObserver.onError(StateCheckingResponseObserver.java:86)
    at com.google.api.gax.grpc.GrpcDirectStreamController$ResponseObserverAdapter.onClose(GrpcDirectStreamController.java:149)
    at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:426)
    at io.grpc.internal.ClientCallImpl.access$500(ClientCallImpl.java:66)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:689)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$900(ClientCallImpl.java:577)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:751)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:740)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)