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

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I'm trying to insert data to Google Datastore from AppEngine and I'm getting an error:

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)

Here's my code:

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);

How do I fix this error?


Are you running AE standard or AE Flexible?

Make sure you have the App Engine api jar in your classpath (WEB-INF/lib directory).