mn create-app example.micronaut.micronautguide \
    --features=crac \
    --build=gradle \
    --lang=java \
    --test=junit

{"message":"Hello World"}

package example.micronaut;

import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;

import java.util.Collections;
import java.util.Map;

@Controller (1)
public class HelloController {

    @Get (2)
    public Map<String, Object> index() {
        return Collections.singletonMap("message", "Hello World"); (3)
    }
}

package example.micronaut;

import io.micronaut.context.ApplicationContext;
import io.micronaut.crac.test.CheckpointSimulator;
import io.micronaut.http.client.BlockingHttpClient;
import io.micronaut.http.client.HttpClient;
import io.micronaut.runtime.server.EmbeddedServer;
import org.junit.jupiter.api.Test;

import java.io.IOException;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;

class HelloControllerTest {

    @Test
    void testHello() throws IOException {
        try(EmbeddedServer server = ApplicationContext.run(EmbeddedServer.class)) {

            BlockingHttpClient client = createHttpClient(server);

            String body = client.retrieve("/");
            assertNotNull(body);
            assertEquals("{\"message\":\"Hello World\"}", body);

            CheckpointSimulator checkpointSimulator = server.getApplicationContext().getBean(CheckpointSimulator.class);

            checkpointSimulator.runBeforeCheckpoint();
            assertFalse(server.isRunning());
            client.close();

            checkpointSimulator.runAfterRestore();
            assertTrue(server.isRunning());

            client = createHttpClient(server);
            body = client.retrieve("/");
            assertNotNull(body);
            assertEquals("{\"message\":\"Hello World\"}", body);

            client.close();
        }
    }

    private static BlockingHttpClient createHttpClient(EmbeddedServer embeddedServer) {
        String url = "http://localhost:" + embeddedServer.getPort();
        return embeddedServer.getApplicationContext().createBean(HttpClient.class, url).toBlocking();
    }
}

./gradlew dockerBuildCrac

...

Successfully built ba78619b8d86
Successfully tagged micronautguide:latest
Created image with ID 'ba78619b8d86'.

BUILD SUCCESSFUL in 1m 41s
13 actionable tasks: 9 executed, 4 up-to-date

tasks.named("dockerBuildCrac") {
    images = ["gcr.io/micronaut-guides-xxxxxxx/micronautguide:latest"]
}

./gradlew dockerPushCrac

> Task :dockerPushCrac
Pushing image 'gcr.io/micronaut-guides-xxxxxxx/micronautguide:latest'.

gcloud run deploy \
    --image=gcr.io/micronaut-guides-xxxxxx/micronautguide:latest \
    --platform managed \
    --execution-environment=gen2 \
    --allow-unauthenticated

Service name (micronautguide):
Please specify a region:

...

 [22] us-central1
 [23] us-east1
 [24] us-east4

...

 [29] cancel
Please enter your numeric choice:  23

To make this the default region, run `gcloud config set run/region us-east1`.

Deploying container to Cloud Run service [micronautguide] in project [micronaut-guides-xxxxxx] region [us-east1]
✓ Deploying... Done.
  ✓ Creating Revision...
  ✓ Routing traffic...
  ✓ Setting IAM Policy...
Done.
Service [micronautguide] revision [micronautguide-00002-fat] has been deployed and is serving 100 percent of traffic.
Service URL: https://micronautguide-63kwrzytgq-ue.a.run.app

curl -i https://micronautguide-63kwrzytgq-ue.a.run.app

HTTP/2 200
content-type: application/json
x-cloud-trace-context: c3845249bc01f6c6a5bb7c01c4500bb8;o=1
date: Thu, 13 Apr 2023 11:09:58 GMT
server: Google Frontend
content-length: 25
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000

{"message":"Hello World"}