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@@ -52,9 +44,19 @@ There are multiple ways to authenticate to use Google Cloud services.
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1. When using `gcloud-java` libraries from within Compute/App Engine, no additional authentication steps are necessary.
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2. When using `gcloud-java` libraries elsewhere, there are two options:
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*[Generate a JSON service account key](https://cloud.google.com/storage/docs/authentication?hl=en#service_accounts). Supply a path to the downloaded JSON credentials file when building the options supplied to datastore/storage constructor.
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*[Generate a JSON service account key](https://cloud.google.com/storage/docs/authentication?hl=en#service_accounts). After downloading that key, you must do one of the following:
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* Define the environment variable GOOGLE_APPLICATION_CREDENTIALS to be the location of the key. For example, `export GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/key.json`
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* Supply the downloaded JSON credentials file when building the options supplied to datastore/storage constructor. For example, `StorageOptions.builder().authCredentials(AuthCredentials.createForJson(new FileInputStream("/path/to/my/key.json")).build().service()` returns a `Storage` object that has the necessary permissions.
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* If running locally for development/testing, you can use use [Google Cloud SDK](https://cloud.google.com/sdk/?hl=en). To use the SDK authentication, [download the SDK](https://cloud.google.com/sdk/?hl=en) if you haven't already. Then login using the SDK (`gcloud auth login` in command line), and set your current project using `gcloud config set project PROJECT_ID`.
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`gcloud-java` looks for credentials in the following order, stopping once it finds credentials:
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1. Credentials supplied to the `DatastoreOptions`/`ServiceOptions` builder
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2. App Engine credentials
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3. Key file pointed to by the GOOGLE_APPLICATION_CREDENTIALS environment variable
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