从spring引导应用程序连接到firestore的java引发空指针异常

4 月，3 周 Questions & Answers 116

您好，我正在尝试将google cloud firestore连接到spring boot应用程序以检索一些数据，但我经常遇到相同的错误。我已经检查了在环境中设置GOOGLE_CREDENTIALS变量，但是运气不好。感谢您的帮助。提前谢谢

服务类别代码

 public TrainInfo getTrainInfo(String trainId) throws InterruptedException, ExecutionException{
                Firestore db=FirestoreOptions.getDefaultInstance().getService();
                DocumentReference docRef = db.collection(COLUMN).document(trainId);
                ApiFuture<DocumentSnapshot> future = docRef.get();
                DocumentSnapshot document = future.get();
        
                TrainInfo trainInfo=null;
        
                if (document.exists()) {
                    // convert document to POJO
                    trainInfo = document.toObject(TrainInfo.class);
        
                } else {
                    System.out.println("No such document!");
                }
                return trainInfo;
            }

错误显示

  java.lang.NullPointerException: null
        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:892) ~[guava-30.1.1-安卓.jar:na]
        at com.google.firestore.v1.DatabaseRootName.<init>(DatabaseRootName.java:56) ~[proto-google-cloud-firestore-v1-2.3.0.jar:2.3.0]
        at com.google.firestore.v1.DatabaseRootName.<init>(DatabaseRootName.java:29) ~[proto-google-cloud-firestore-v1-2.3.0.jar:2.3.0]
        at com.google.firestore.v1.DatabaseRootName$Builder.build(DatabaseRootName.java:157) ~[proto-google-cloud-firestore-v1-2.3.0.jar:2.3.0]
        at com.google.firestore.v1.DatabaseRootName.of(DatabaseRootName.java:61) ~[proto-google-cloud-firestore-v1-2.3.0.jar:2.3.0]
        at com.google.cloud.firestore.spi.v1.GrpcFirestoreRpc.<init>(GrpcFirestoreRpc.java:111) ~

Python中文网

有 Java 编程相关的问题?

从spring引导应用程序连接到firestore的java引发空指针异常

共 (1) 个答案

# 1 楼答案