Set up a Java development environment

This tutorial shows how to prepare your local machine for Java development, including developing Java apps that run on Cloud de Confiance by S3NS. Follow these steps to install Java and relevant tools.

Objectives

• Install a JDK (Java Development Kit).
• Install a build automation tool.
• Install the gcloud CLI.
• (Optional) Install an IDE or editor.
• (Optional) Install IDE Cloud de Confiance by S3NS plugin.
• Install the Cloud Client Libraries for Java.
• Set up authentication.

Install a JDK (Java Development Kit)

You may choose any Java distribution of your choice by ensuring that the following environment variables are set:

• JAVA_HOME: Points to the base of the JDK installation.
• PATH: Includes $JAVA_HOME/bin.

Eclipse Temurin is the recommended OpenJDK (Java Development Kit) distribution for use with Cloud de Confiance by S3NS. Temurin is open-source licensed, Java SE TCK-certified, and tested to ensure production-quality performance and security.

(Recommended) Installing Temurin

Temurin's installation instructions vary by operating system.

• Binaries are available for download.
• For Docker containers, use the official 'eclipse-temurin' image.

If you are using Compute Engine boot images, you can use the following installation scripts.

Install a build automation tool

Apache Maven, Gradle, and SBT are package management options that can help build Java app dependencies quickly and consistently across platforms.

Install the gcloud CLI

The gcloud CLI is a set of tools for Cloud de Confiance. It contains gcloud and bq, which you can use to access Compute Engine, Cloud Storage, BigQuery, and other products and services from the command line. You can run these tools interactively or in your automated scripts.

(Optional) Install an IDE or editor

Popular editors (in no particular order) used to develop Java apps include, but are not limited to:

• Visual Studio Code
• IntelliJ IDEA and/or Webstorm by JetBrains
• Eclipse by Eclipse Foundation
• Atom by GitHub

These editors (sometimes with the help of plugins) give you everything from syntax highlighting, intelli-sense, and code completion to fully integrated debugging capabilities.

Install the Cloud Client Libraries for Java

Use the Cloud Client Libraries for Java to integrate with Cloud de Confiance services, such as Datastore and Cloud Storage. You can install the package for an individual API, such as BigQuery, as shown in the following example.

If you are using Maven, add the following to your pom.xml file. For more information about BOMs, see The Google Cloud Platform Libraries BOM.

<!--  Using libraries-bom to manage versions.
See https://github.com/GoogleCloudPlatform/cloud-opensource-java/wiki/The-Google-Cloud-Platform-Libraries-BOM -->
<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>libraries-bom</artifactId>
      <version>26.62.0</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-bigquery</artifactId>
  </dependency>
</dependencies>

If you are using Gradle, add the following to your dependencies:

implementation platform('com.google.cloud:libraries-bom:26.45.0')

implementation 'com.google.cloud:google-cloud-bigquery'

If you are using sbt, add the following to your dependencies:

libraryDependencies += "com.google.cloud" % "google-cloud-bigquery" % "2.42.2"

If you're using Visual Studio Code, IntelliJ, or Eclipse, you can add client libraries to your project using the following IDE plugins:

• Cloud Code for VS Code
• Cloud Code for IntelliJ
• Cloud Tools for Eclipse

The plugins provide additional functionality, such as key management for service accounts. Refer to each plugin's documentation for details.

Set up authentication

To run the client library, you must first set up authentication.

Create local authentication credentials for your user account:

gcloud auth application-default login

If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

For more information, see Authenticate for using client libraries.

Use the client library

// Imports the Google Cloud client library
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Dataset;
import com.google.cloud.bigquery.DatasetInfo;

public class QuickstartSample {
  public static void main(String... args) throws Exception {
    // Instantiate a client. If you don't specify credentials when constructing a client, the
    // client library will look for credentials in the environment, such as the
    // GOOGLE_APPLICATION_CREDENTIALS environment variable.
    BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

    // The name for the new dataset
    String datasetName = "my_new_dataset";

    // Prepares a new dataset
    Dataset dataset = null;
    DatasetInfo datasetInfo = DatasetInfo.newBuilder(datasetName).build();

    // Creates the dataset
    dataset = bigquery.create(datasetInfo);

    System.out.printf("Dataset %s created.%n", dataset.getDatasetId().getDataset());
  }
}

Configure endpoints for the client library

If you use APIs that support regional endpoints, use endpoints to configure which server to send requests to. For example, with the Google.Cloud.Dataproc.V1 API, you might configure a client endpoint. You can read more about regional endpoints for Dataproc here. Be sure to replace MY-PROJECT with your project name and us-central1 with the region appropriate for your configuration in the following example:

ClusterControllerSettings settings =
     ClusterControllerSettings.newBuilder()
        .setEndpoint("us-central1-dataproc.googleapis.com:443")
        .build();
 try (ClusterControllerClient clusterControllerClient = ClusterControllerClient.create(settings)) {
   String projectId = "MY-PROJECT";
   String region = "us-central1";
   Cluster cluster = Cluster.newBuilder().build();
 }

What's next

• Browse the documentation for Cloud de Confiance products.
• Clone the Java samples repository from GitHub.