How to fix error: A project ID is required for this service but could not be determined

Question

我正在尝试从 AppEngine 向 Google 数据存储区插入数据，但出现错误：

java.lang.IllegalArgumentException: A project ID is required for this service but could not be determined from the builder or the environment.  Please set a project ID using the builder.
    at com.google.common.base.Preconditions.checkArgument(Preconditions.java:92)
    at com.google.cloud.ServiceOptions.<init>(ServiceOptions.java:324)
    at com.google.cloud.datastore.DatastoreOptions.<init>(DatastoreOptions.java:85)
    at com.google.cloud.datastore.DatastoreOptions.<init>(DatastoreOptions.java:32)
    at com.google.cloud.datastore.DatastoreOptions$Builder.build(DatastoreOptions.java:75)
    at com.google.cloud.datastore.DatastoreOptions.defaultInstance(DatastoreOptions.java:123)

这是我的代码：

Datastore datastore = DatastoreOptions.defaultInstance().service();     
             KeyFactory keyFactory = datastore.newKeyFactory().kind("keyKind"); 
             Key key = keyFactory.newKey("keyName"); 
             Entity entity = Entity.builder(key) 
                 .set("name", "John Doe") 
                 .set("age", 30) 
                 .set("access_time", DateTime.now()) 
                 .build(); 
             datastore.put(entity);

如何修复此错误？

Answer 1

你是运行AE标准还是AE Flexible？

确保您的类路径（WEB-INF/lib 目录）中有 App Engine api jar。

Answer 2

在我的例子中，下一个代码有效：

    BigQuery bigquery = BigQueryOptions.newBuilder().setProjectId("XXXXX")
            .setCredentials(
                    ServiceAccountCredentials.fromStream(new FileInputStream("key.json"))
            ).build().getService();

我在构建器中设置了projectId。

How to fix error: A project ID is required for this service but could not be determined

How to fix error: A project ID is required for this service but could not be determined

google-app-engine

google-cloud-datastore

gcloud

gcloud-java