A project ID is required for this service but could not be determined from the builder or the environment

[Gregory Was via StackOverflow]

I'm trying to insert data to Google Datastore and i'm getting bellow 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.(ServiceOptions.java:324) at com.google.cloud.datastore.DatastoreOptions.(DatastoreOptions.java:85) at com.google.cloud.datastore.DatastoreOptions.(DatastoreOptions.java:32) at com.google.cloud.datastore.DatastoreOptions$Builder.build(DatastoreOptions.java:75) at com.google.cloud.datastore.DatastoreOptions.defaultInstance(DatastoreOptions.java:123)

CODE is:

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); 

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http://stackoverflow.com/questions/36673248/a-project-id-is-required-for-this-service-but-could-not-be-determined-from-the-b

[ozarov via StackOverflow]

Are you running AE standard or AE Flexible?

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

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http://stackoverflow.com/questions/36673248/a-project-id-is-required-for-this-service-but-could-not-be-determined-from-the-b/36681969#36681969