The Pub/Sub sample application demonstrates some common operations with Pub/Sub and is compatible with Native Image compilation.

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

1. If you have not already, create a Google Cloud Platform Project.

2. Install the Google Cloud 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:

   gcloud auth application-default login
   

   Note: Authenticating with Application Default Credentials is convenient to use during development, but we recommend alternate methods of authentication during production use.

3. Install the native image compiler.

   You can follow the official installation instructions. After following the instructions, ensure that you install the native image extension installed by running:

   gu install native-image
   

   Once you finish following the instructions, verify that the default version of Java is set to the correct version by running java -version in a terminal.

   You will see something similar to the below output:

   $ java -version
   
   openjdk version "17.0.3" 2022-04-19
   OpenJDK Runtime Environment GraalVM CE 22.1.0 (build 17.0.3+7-jvmci-22.1-b06)
   OpenJDK 64-Bit Server VM GraalVM CE 22.1.0 (build 17.0.3+7-jvmci-22.1-b06, mixed mode, sharing)
   

4. Enable the Pub/Sub APIs.

Navigate to this directory in a new terminal.

1. Compile the application using the Native Image Compiler. This step may take a few minutes.

   mvn package -P native -DskipTests
   

2. Run the application:

   ./target/native-image-sample
   

3. The application will create a new Pub/Sub topic, send and receive a message from it, and then delete the topic.

   Created topic: projects/YOUR_PROJECT_ID/topics/graal-pubsub-test-00e72640-4e36-4aff-84d2-13b7569b2289 under project: YOUR_PROJECT_ID
   Created pull subscription: projects/YOUR_PROJECT_ID/subscriptions/graal-pubsub-test-sub2fb5e3f3-cb26-439b-b88c-9cb0cfca9e45
   Published message with ID: 457327433078420
   Received Payload: Pub/Sub Native Image Test published message at timestamp: 2020-09-23T19:45:42.746514Z
   Deleted topic projects/YOUR_PROJECT_ID/topics/graal-pubsub-test-00e72640-4e36-4aff-84d2-13b7569b2289
   Deleted subscription projects/YOUR_PROJECT_ID/subscriptions/graal-pubsub-test-sub2fb5e3f3-cb26-439b-b88c-9cb0cfca9e45
   

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

mvn test -Pnative