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AuthenticateImplicitWithAdc.java
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AuthenticateImplicitWithAdc.java
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/*
* Copyright 2022 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import java.io.IOException;
public class AuthenticateImplicitWithAdc {
public static void main(String[] args) throws IOException {
// TODO(Developer):
// 1. Before running this sample, authenticate using ADC as mentioned in:
// https://cloud.google.com/docs/authentication/provide-credentials-adc#how_to_provide_credentials_to_adc
// 2. Replace the projectId variable.
// 3. Make sure you have the necessary permission "compute.instances.list"
String projectId = "your-google-cloud-project-id";
authenticateImplicitWithAdc(projectId);
}
// When interacting with Google Cloud Client libraries, the library can auto-detect the
// credentials to use.
// ADC detection is independent of the client library and language and works with all Cloud Client
// libraries.
public static void authenticateImplicitWithAdc(String project) throws IOException {
String zone = "us-central1-a";
// This snippet demonstrates how to initialize Cloud Compute Engine and list instances.
// Note that the credentials are not specified when constructing the client.
// Hence, the client library will look for credentials using ADC.
try (InstancesClient instancesClient = InstancesClient.create()) {
// Set the project and zone to retrieve instances present in the zone.
System.out.printf("Listing instances from %s in %s:", project, zone);
for (Instance zoneInstance : instancesClient.list(project, zone).iterateAll()) {
System.out.println(zoneInstance.getName());
}
System.out.println("####### Listing instances complete #######");
}
}
}