应用程序默认凭据无法创建Google App Engine服务帐户凭据

Question

我正在开发一个使用部署在AppEngine上的剩余端点启动Google VM实例的应用程序。

初始化Compute Engine API时，我提供了应用程序默认凭据（因为我期望这将返回AppEngine服务帐户凭据）

GoogleCredential credential = GoogleCredential.getApplicationDefault();
if (credential.createScopedRequired()) {
    List<String> scopes = new ArrayList<>();
    // Set Google Compute Engine scope to Read-write.
    scopes.add(ComputeScopes.COMPUTE);
    credential = credential.createScoped(scopes);
}
return new Compute.Builder(httpTransport(), jsonFactory(), credential)
                  .setApplicationName(env.getProperty("spring.application.name"))
                  .build();

但是我最终遇到了错误：

java.io.IOException: Application Default Credentials failed to create the Google App Engine service account credentials

我正在使用库：

<dependency>
    <groupId>com.google.api-client</groupId>
    <artifactId>google-api-client</artifactId>
    <version>${google-api-client.version}</version>
</dependency>
<dependency>
    <groupId>com.google.apis</groupId>
    <artifactId>google-api-services-compute</artifactId>
    <version>${google-api-services-compute.version}</version>
</dependency>

Answer 1

我通过使用google-api-cient-appengine而不是google-api-client解决了此问题：

<dependency>
    <groupId>com.google.api-client</groupId>
    <artifactId>google-api-client-appengine</artifactId>
    <version>${google-api-client-appengine.version}</version>
</dependency>

并使用初始化了GoogleCredential ：

GoogleCredential credential = AppEngineCredentialWrapper.getApplicationDefault();