Update README.md

micronaut/src/main/java/com/baeldung/micronaut/helloworld/client/ConcreteGreetingClient.java

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+package com.baeldung.micronaut.helloworld.client;
+
+import io.micronaut.http.HttpRequest;
+import io.micronaut.http.client.annotation.Client;
+import io.micronaut.http.client.RxHttpClient;
+import io.reactivex.Single;
+
+import javax.inject.Singleton;
+
+@Singleton
+public class ConcreteGreetingClient
+{
+   private RxHttpClient httpClient;
+
+   public ConcreteGreetingClient(@Client("/") RxHttpClient httpClient) {
+      this.httpClient = httpClient;
+   }
+
+   public String greet(String name) {
+      HttpRequest<String> req = HttpRequest.GET("/greet/" + name);
+      return httpClient.retrieve(req).blockingFirst();
+   }
+
+   public Single<String> greetAsync(String name) {
+      HttpRequest<String> req = HttpRequest.GET("/async/greet/" + name);
+      return httpClient.retrieve(req).first("An error as occurred");
+   }
+}

micronaut/src/main/java/com/baeldung/micronaut/helloworld/client/GreetingClient.java

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+package com.baeldung.micronaut.helloworld.client;
+
+import io.micronaut.http.annotation.Get;
+import io.micronaut.http.client.annotation.Client;
+
+@Client("/greet")
+public interface GreetingClient {
+
+    @Get("/{name}")
+    String greet(String name);
+}

micronaut/src/main/java/com/baeldung/micronaut/helloworld/server/ServerApplication.java

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+package com.baeldung.micronaut.helloworld.server;
+
+import io.micronaut.runtime.Micronaut;
+
+public class ServerApplication {
+
+    public static void main(String[] args) {
+        Micronaut.run(ServerApplication.class);
+    }
+}

micronaut/src/main/java/com/baeldung/micronaut/helloworld/server/controller/AsyncGreetController.java

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+package com.baeldung.micronaut.helloworld.server.controller;
+
+import com.baeldung.micronaut.helloworld.server.service.GreetingService;
+import io.micronaut.http.annotation.Controller;
+import io.micronaut.http.annotation.Get;
+import io.reactivex.Single;
+
+import javax.inject.Inject;
+
+@Controller("/async/greet")
+public class AsyncGreetController {
+
+    @Inject
+    private GreetingService greetingService;
+
+    @Get("/{name}")
+    public Single<String> greet(String name) {
+        return Single.just(greetingService.getGreeting() + name);
+    }
+}

micronaut/src/main/java/com/baeldung/micronaut/helloworld/server/controller/GreetController.java

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+package com.baeldung.micronaut.helloworld.server.controller;
+
+import com.baeldung.micronaut.helloworld.server.service.GreetingService;
+import io.micronaut.http.MediaType;
+import io.micronaut.http.annotation.Body;
+import io.micronaut.http.annotation.Controller;
+import io.micronaut.http.annotation.Get;
+import io.micronaut.http.annotation.Post;
+
+import javax.inject.Inject;
+
+@Controller("/greet")
+public class GreetController {
+
+    @Inject
+    private GreetingService greetingService;
+
+    @Get("/{name}")
+    public String greet(String name) {
+        return greetingService.getGreeting() + name;
+    }
+
+    @Post(value = "/{name}", consumes = MediaType.TEXT_PLAIN)
+    public String setGreeting(@Body String name)
+    {
+        return greetingService.getGreeting() + name;
+    }
+}

micronaut/src/main/java/com/baeldung/micronaut/helloworld/server/service/EnglishGreetingService.java

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+package com.baeldung.micronaut.helloworld.server.service;
+
+import io.micronaut.context.annotation.Primary;
+
+import javax.inject.Singleton;
+
+@Primary
+@Singleton
+public class EnglishGreetingService implements GreetingService {
+    @Override
+    public String getGreeting() {
+        return "Hello ";
+    }
+}

micronaut/src/main/java/com/baeldung/micronaut/helloworld/server/service/GreetingService.java

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+package com.baeldung.micronaut.helloworld.server.service;
+
+public interface GreetingService {
+
+    String getGreeting();
+}

micronaut/src/main/java/com/baeldung/micronaut/helloworld/server/service/SpanishGreetingService.java

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+package com.baeldung.micronaut.helloworld.server.service;
+
+import javax.inject.Singleton;
+
+@Singleton
+public class SpanishGreetingService implements GreetingService {
+    @Override
+    public String getGreeting() {
+        return "Hola ";
+    }
+}

micronaut/src/main/resources/application.yml

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+micronaut:
+    application:
+        name: hello-world-server
+    server:
+        port: 9080

micronaut/src/main/resources/logback.xml

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+<configuration>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <!-- encoders are assigned the type
+             ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="info">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

micronaut/src/test/java/com/baeldung/micronaut/helloworld/client/ConcreteGreetingClientTest.java

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+package com.baeldung.micronaut.helloworld.client;
+
+import io.micronaut.context.ApplicationContext;
+import io.micronaut.runtime.server.EmbeddedServer;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class ConcreteGreetingClientTest
+{
+   private EmbeddedServer server;
+   private ConcreteGreetingClient client;
+
+   @Before
+   public void setup()
+   {
+      server = ApplicationContext.run(EmbeddedServer.class);
+      client = server.getApplicationContext().getBean(ConcreteGreetingClient.class);
+   }
+
+   @After
+   public void cleanup()
+   {
+      server.stop();
+   }
+
+   @Test
+   public void testGreeting() {
+      assertEquals(client.greet("Mike"), "Hello Mike");
+   }
+
+   @Test
+   public void testGreetingAsync() {
+      assertEquals(client.greetAsync("Mike").blockingGet(), "Hello Mike");
+   }
+}

micronaut/src/test/java/com/baeldung/micronaut/helloworld/client/GreetingClientTest.java

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+package com.baeldung.micronaut.helloworld.client;
+
+import io.micronaut.context.ApplicationContext;
+import io.micronaut.runtime.server.EmbeddedServer;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class GreetingClientTest {
+    private EmbeddedServer server;
+    private GreetingClient client;
+
+    @Before
+    public void setup()
+    {
+        server = ApplicationContext.run(EmbeddedServer.class);
+        client = server.getApplicationContext().getBean(GreetingClient.class);
+    }
+
+    @After
+    public void cleanup()
+    {
+        server.stop();
+    }
+
+    @Test
+    public void testGreeting() {
+        assertEquals(client.greet("Mike"), "Hello Mike");
+    }
+}