The Storage sample application demonstrates some common operations with Google Cloud Storage and is compatible with Native Image compilation.

You will need to follow these prerequisite steps in order to run these samples:

1. If you have not already, [create a Google Cloud Platform Project](https://cloud.google.com/resource-manager/docs/creating-managing-projects#creating_a_project).

2. Install the [Google Cloud SDK](https://cloud.google.com/sdk/) which will allow you to run the sample with your project's credentials.

Once installed, log in with Application Default Credentials using the following command:

```

```

In order to run the sample integration test as a native image, call the following command:

```

```

<?xml version='1.0' encoding='UTF-8'?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.google.cloud</groupId>

<artifactId>native-image-sample</artifactId>

<name>Native Image Sample</name>

<url>https://github.com/googleapis/java-storage</url>

<!--

<parent>

<groupId>com.google.cloud.samples</groupId>

<artifactId>shared-configuration</artifactId>

<version>1.2.0</version>

</parent>

<properties>

<!-- Java 8 because the Kokoro Sample test uses that Java version -->

<maven.compiler.target>1.8</maven.compiler.target>

<maven.compiler.source>1.8</maven.compiler.source>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<dependencyManagement>

<dependencies>

<dependency>

<groupId>com.google.cloud</groupId>

<artifactId>libraries-bom</artifactId>

<version>24.3.0</version>

<type>pom</type>

<scope>import</scope>

</dependency>

</dependencies>

</dependencyManagement>

<dependencies>

<dependency>

<groupId>com.google.cloud</groupId>

<artifactId>google-cloud-core</artifactId>

</dependency>

<dependency>

<groupId>com.google.cloud</groupId>

<artifactId>google-cloud-storage</artifactId>

</dependency>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>4.13.2</version>

<scope>test</scope>

</dependency>

<dependency>

<groupId>com.google.truth</groupId>

<artifactId>truth</artifactId>

<version>1.1.3</version>

<scope>test</scope>

</dependency>

</dependencies>

<build>

<!-- This plugin enables building the application to a JAR *not* using Native Image -->

<plugins>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-jar-plugin</artifactId>

<version>3.2.2</version>

<configuration>

<archive>

<manifest>

<addClasspath>true</addClasspath>

<classpathPrefix>dependency-jars/</classpathPrefix>

<mainClass>com.example.storage.NativeImageStorageSample</mainClass>

</manifest>

</archive>

</configuration>

</plugin>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-dependency-plugin</artifactId>

<version>3.2.0</version>

<executions>

<execution>

<id>copy-dependencies</id>

<phase>package</phase>

<goals>

<goal>copy-dependencies</goal>

</goals>

<configuration>

<outputDirectory>

${project.build.directory}/dependency-jars/

</outputDirectory>

</configuration>

</execution>

</executions>

</plugin>

</plugins>

</build>

<!-- Native Profile-->

<profiles>

<profile>

<id>native</id>

<dependencies>

<dependency>

<groupId>com.google.cloud</groupId>

<artifactId>native-image-support</artifactId>

<version>0.12.0</version>

</dependency>

<dependency>

<groupId>org.junit.vintage</groupId>

<artifactId>junit-vintage-engine</artifactId>

<version>5.8.2</version>

<scope>test</scope>

</dependency>

<dependency>

<groupId>org.graalvm.buildtools</groupId>

<artifactId>junit-platform-native</artifactId>

<version>0.9.9</version>

<scope>test</scope>

</dependency>

</dependencies>

<build>

<plugins>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-surefire-plugin

</artifactId> <!-- Must use older version of surefire plugin for native-image testing. -->

<version>2.22.2</version>

<configuration>

<includes>

<include>**/*IT</include>

</includes>

</configuration>

</plugin>

<plugin>

<groupId>org.graalvm.buildtools</groupId>

<artifactId>native-maven-plugin</artifactId>

<version>0.9.9</version>

<extensions>true</extensions>

<configuration>

<mainClass>com.example.storage.NativeImageStorageSample</mainClass>

<buildArgs>

<buildArg>--no-fallback</buildArg>

<buildArg>--no-server</buildArg>

</buildArgs>

</configuration>

<executions>

<execution>

<id>build-native</id>

<goals>

<goal>build</goal>

<goal>test</goal>

</goals>

<phase>package</phase>

</execution>

<execution>

<id>test-native</id>

<goals>

<goal>test</goal>

</goals>

<phase>test</phase>

</execution>

</executions>

</plugin>

</plugins>

</build>

</profile>

</profiles>

</project>

package com.example.storage;

import com.google.cloud.BatchResult.Callback;

import com.google.cloud.storage.Blob;

import com.google.cloud.storage.BlobId;

import com.google.cloud.storage.BlobInfo;

import com.google.cloud.storage.BucketInfo;

import com.google.cloud.storage.Storage;

import com.google.cloud.storage.StorageBatch;

import com.google.cloud.storage.StorageException;

import com.google.cloud.storage.StorageOptions;

import java.nio.charset.StandardCharsets;

import java.util.UUID;

public class NativeImageStorageSample {

static String BUCKET_NAME = "nativeimage-sample-bucket-" + UUID.randomUUID();

static String FILENAME = "nativeimage-sample-file-" + UUID.randomUUID();

/** Runs the storage sample application. */

public static void main(String[] args) {

Storage storageClient = StorageOptions.getDefaultInstance().getService();

try {

createBucket(storageClient, BUCKET_NAME);

createFile(storageClient, BUCKET_NAME, FILENAME);

runBatchOperations(storageClient, BUCKET_NAME, FILENAME);

} finally {

System.out.println("Deleting resources.");

storageClient.delete(BUCKET_NAME, FILENAME);

storageClient.delete(BUCKET_NAME);

}

}

private static void runBatchOperations(

Storage storageClient, String bucketName, String fileName) {

BlobId blobId = BlobId.of(bucketName, fileName);

StorageBatch batch = storageClient.batch();

batch

.update(BlobInfo.newBuilder(blobId).build())

.notify(

new Callback<Blob, StorageException>() {

@Override

public void success(Blob blob) {

System.out.println("Batch update succeeded on " + fileName);

}

@Override

public void error(StorageException e) {

System.out.println("Batch update failed with cause: " + e);

}

});

batch.submit();

}

private static void createBucket(Storage storageClient, String bucketName) {

BucketInfo bucketInfo = BucketInfo.newBuilder(bucketName).setLocation("us-east1").build();

storageClient.create(bucketInfo);

System.out.println("Created bucket " + bucketName);

}

private static void createFile(Storage storageClient, String bucketName, String fileName) {

BlobInfo blobInfo =

BlobInfo.newBuilder(bucketName, fileName).setContentType("text/plain").build();

storageClient.create(blobInfo, "Hello World!".getBytes(StandardCharsets.UTF_8));

System.out.println("Created file " + blobInfo.getName());

Blob blob = storageClient.get(bucketName, fileName);

String content = new String(blob.getContent(), StandardCharsets.UTF_8);

System.out.println("Successfully wrote to file: " + content);

}

}

package com.example.storage;

import static com.google.common.truth.Truth.assertThat;

import com.google.cloud.testing.junit4.StdOutCaptureRule;

import org.junit.Rule;

import org.junit.Test;

public class NativeImageStorageSampleIT {

@Rule public StdOutCaptureRule stdOut = new StdOutCaptureRule();

@Test

public void createAndReadStorageResources() {

NativeImageStorageSample.main(new String[] {});

assertThat(stdOut.getCapturedOutputAsUtf8String())

.contains("Created bucket " + NativeImageStorageSample.BUCKET_NAME);

assertThat(stdOut.getCapturedOutputAsUtf8String())

.contains("Created file " + NativeImageStorageSample.FILENAME);

assertThat(stdOut.getCapturedOutputAsUtf8String())

.contains("Successfully wrote to file: Hello World!");

}

}