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Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::profiler_v2::ExportServiceClient(
google::cloud::profiler_v2::MakeExportServiceConnection(options));
}
Follow these links to find examples for other *Client classes:
Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.
See AlsoAuthentication Components - for more information on the factory functions to create google::cloud::Credentials objects.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, with version 2.23.0 being the base version."],["The latest release candidate, version 2.37.0-rc, and past versions from 2.36.0 down to 2.11.0 are also accessible, each with their corresponding documentation on how to override authentication."],["The `UnifiedCredentialsOption` can be utilized to override the default credentials, allowing users to explicitly load a service account key file, exemplified through code."],["Additional examples for using service account credentials with the `profiler_v2::ExportServiceClient` and `profiler_v2::ProfilerServiceClient` are also provided."],["The page recommends consulting the \"Best practices for managing service account keys\" guide for more details on service account key management and refers users to the \"Authentication Components\" page for additional information on `google::cloud::Credentials`."]]],[]]
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