Java idiomatic client for Google Cloud Platform services.
Libraries are available on GitHub and Maven Central for developing Java applications that interact with individual Google Cloud services:
If the service is not listed, google-api-java-client interfaces with additional Google Cloud APIs using a legacy REST interface.
When building Java applications, preference should be given to the libraries listed in the table.
Most google-cloud libraries require a project ID. There are multiple ways to specify this project ID.
google-cloud libraries from within Compute/App Engine, there's no need to specify a project ID. It is automatically inferred from the production environment.When using google-cloud elsewhere, you can do one of the following:
Datastore datastore = DatastoreOptions.newBuilder().setProjectId("PROJECT_ID").build().getService();GOOGLE_CLOUD_PROJECT to be your desired project ID.gcloud config set project PROJECT_IDgoogle-cloud determines the project ID from the following sources in the listed order, stopping once it finds a value:
GOOGLE_CLOUD_PROJECTGOOGLE_APPLICATION_CREDENTIALS environment variableIn cases where the library may expect a project ID explicitly, we provide a helper that can provide the inferred project ID:
import com.google.cloud.ServiceOptions;
...
String projectId = ServiceOptions.getDefaultProjectId();google-cloud-java uses
https://github.com/googleapis/google-auth-library-java
to authenticate requests. google-auth-library-java supports a wide range of authentication types;
see the project's README
and javadoc for more
details.
When using Google Cloud libraries from a Google Cloud Platform environment such as Compute Engine, Kubernetes Engine, or App Engine, no additional authentication steps are necessary.
For example:
Storage storage = StorageOptions.getDefaultInstance().getService();or:
CloudTasksClient cloudTasksClient = CloudTasksClient.create();After downloading that key, you must do one of the following:
export GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/key.jsonStorage storage = StorageOptions.newBuilder()
.setCredentials(ServiceAccountCredentials.fromStream(new FileInputStream("/path/to/my/key.json")))
.build()
.getService();If running locally for development/testing, you can use the Google Cloud SDK.
Create Application Default Credentials with gcloud auth application-default login, and then
google-cloud will automatically detect such credentials.
If you already have an OAuth2 access token, you can use it to authenticate (notice that in this case, the access token will not be automatically refreshed):
Credentials credentials = GoogleCredentials.create(new AccessToken(accessToken, expirationTime));
Storage storage = StorageOptions.newBuilder()
.setCredentials(credentials)
.build()
.getService();or:
Credentials credentials = GoogleCredentials.create(new AccessToken(accessToken, expirationTime));
CloudTasksSettings cloudTasksSettings = CloudTasksSettings.newBuilder()
.setCredentialProvider(FixedCredentialsProvider.create(credentials))
.build();
CloudTasksClient cloudTasksClient = CloudTasksClient.create(cloudTasksSettings);If no credentials are provided, google-cloud will attempt to detect them from the environment
using GoogleCredentials.getApplicationDefault() which will search for Application Default
Credentials in the following locations (in order):
GOOGLE_APPLICATION_CREDENTIALS environment variablegcloud auth application-default login commandTo get help, follow the instructions in the Troubleshooting document.
For HTTP clients, a proxy can be configured by using http.proxyHost, https.proxyHost, and
related system properties as documented by
Java Networking and Proxies.
For gRPC clients, a proxy can be configured by using the
GRPC_PROXY_EXP environment variable as documented by
the gRPC release notes.
Please note that gRPC proxy support is currently experimental.
For a more custom proxy, you will need supply a ProxyDetector to the ManagedChannelBuilder:
import com.google.api.core.ApiFunction;
import com.google.api.gax.rpc.TransportChannelProvider;
import com.google.cloud.tasks.v2.CloudTasksClient;
import com.google.cloud.tasks.v2.CloudTasksSettings;
import com.google.cloud.tasks.v2.stub.CloudTasksStubSettings;
import io.grpc.HttpConnectProxiedSocketAddress;
import io.grpc.ManagedChannelBuilder;
import io.grpc.ProxiedSocketAddress;
import io.grpc.ProxyDetector;
import javax.annotation.Nullable;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
public CloudTasksClient getService() throws IOException {
TransportChannelProvider transportChannelProvider =
CloudTasksStubSettings.defaultGrpcTransportProviderBuilder()
.setChannelConfigurator(
new ApiFunction<ManagedChannelBuilder, ManagedChannelBuilder>() {
@Override
public ManagedChannelBuilder apply(ManagedChannelBuilder managedChannelBuilder) {
return managedChannelBuilder.proxyDetector(
new ProxyDetector() {
@Nullable
@Override
public ProxiedSocketAddress proxyFor(SocketAddress socketAddress)
throws IOException {
return HttpConnectProxiedSocketAddress.newBuilder()
.setUsername(PROXY_USERNAME)
.setPassword(PROXY_PASSWORD)
.setProxyAddress(new InetSocketAddress(PROXY_HOST, PROXY_PORT))
.setTargetAddress((InetSocketAddress) socketAddress)
.build();
}
});
}
})
.build();
CloudTasksSettings cloudTasksSettings =
CloudTasksSettings.newBuilder()
.setTransportChannelProvider(transportChannelProvider)
.build();
return CloudTasksClient.create(cloudTasksSettings);
}Java 7 or above is required for using the clients in this repository.
Clients in this repository use either HTTP or gRPC for the transport layer. All HTTP-based clients should work in all environments.
For clients that use gRPC, the supported platforms are constrained by the platforms that Forked Tomcat Native supports, which for architectures means only x86_64, and for operating systems means Mac OS X, Windows, and Linux. Additionally, gRPC constrains the use of platforms with threading restrictions.
Thus, the following are not supported:
The following environments should work (among others):
This library provides tools to help write tests for code that uses google-cloud services.
See TESTING to read more about using our testing helpers.
This library follows Semantic Versioning, with some additional qualifications:
Components marked with @BetaApi or @Experimental are considered to be "0.x"
features inside a "1.x" library. This means they can change between minor and
patch releases in incompatible ways. These features should not be used by any
library "B" that itself has consumers, unless the components of library B that
use @BetaApi features are also marked with @BetaApi. Features marked as
@BetaApi are on a path to eventually become "1.x" features with the marker
removed.
Special exception for google-cloud-java: google-cloud-java is
allowed to depend on @BetaApi features in gax-java without declaring the consuming
code @BetaApi, because gax-java and google-cloud-java move in step
with each other. For this reason, gax-java should not be used
independently of google-cloud-java.
Components marked with @InternalApi are technically public, but only
because of the limitations of Java's access
modifiers. For the purposes of semver, they should be considered private.
Interfaces marked with @InternalExtensionOnly are public, but should only be
implemented by internal classes. For the purposes of semver, we reserve the right
to add to these interfaces without default implementations (for Java 7).
Please note these clients are currently under active development. Any release versioned 0.x.y is subject to backwards incompatible changes at any time.
Libraries defined at a GA quality level are expected to be stable and all updates in the libraries are guaranteed to be backwards-compatible. Any backwards-incompatible changes will lead to the major version increment (1.x.y -> 2.0.0).
Libraries defined at a Beta quality level are expected to be mostly stable and we're working towards their release candidate. We will address issues and requests with a higher priority.
Libraries defined at an Alpha quality level are still a work-in-progress and are more likely to get backwards-incompatible updates. Additionally, it's possible for Alpha libraries to get deprecated and deleted before ever being promoted to Beta or GA.
If you're using IntelliJ or Eclipse, you can add client libraries to your project using these IDE plugins:
Besides adding client libraries, the plugins provide additional functionality, such as service account key management. Refer to the documentation for each plugin for more details.
These client libraries can be used on App Engine standard for Java 8 runtime and App Engine flexible (including the Compat runtime). Most of the libraries do not work on the App Engine standard for Java 7 runtime. However, Datastore, Storage, and Bigquery should work.
Contributions to this library are always welcome and highly encouraged.
See google-cloud's CONTRIBUTING documentation and the shared documentation for more information on how to get started.
Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms. See Code of Conduct for more information.
Apache 2.0 - See LICENSE for more information.
