Chapter 3. Creating the Getting Started project

Procedure

1. In a command terminal, enter the following command to verify that Maven is using JDK 11 and that the Maven version is 3.6.2 or higher:

   mvn --version

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2. If the preceding command does not return JDK 11, add the path to JDK 11 to the PATH environment variable and enter the preceding command again.

3. To generate the project, enter one of the following commands:

   Note

   Apple macOS and Microsoft Windows are not supported production environments.

   • If you are using Linux or Apple macOS, enter the following command:

     mvn io.quarkus:quarkus-maven-plugin:1.11.7.Final-redhat-00009:create \
         -DprojectGroupId=org.acme \
         -DprojectArtifactId=getting-started \
         -DplatformGroupId=com.redhat.quarkus \
         -DplatformVersion=1.11.7.Final-redhat-00009 \
         -DclassName="org.acme.quickstart.GreetingResource" \
         -Dpath="/hello"
     cd getting-started

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   • If you are using the Microsoft Windows command line, enter the following command:

     mvn io.quarkus:quarkus-maven-plugin:1.11.7.Final-redhat-00009:create -DprojectGroupId=org.acme -DprojectArtifactId=getting-started -DplatformGroupId=com.redhat.quarkus -DplatformVersion=1.11.7.Final-redhat-00009 -DclassName="org.acme.quickstart.GreetingResource" -Dpath="/hello"

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   • If you are using the Microsoft Windows Powershell, enter the following command:

     mvn io.quarkus:quarkus-maven-plugin:1.11.7.Final-redhat-00009:create "-DprojectGroupId=org.acme" "-DprojectArtifactId=getting-started" "-DplatformVersion=1.11.7.Final-redhat-00009" "-DplatformGroupId=com.redhat.quarkus" "-DclassName=org.acme.quickstart.GreetingResource" "-Dpath=/hello"

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     These commands create the following elements in the ./getting-started directory:

     • The Maven project directory structure
     • An org.acme.quickstart.GreetingResource resource exposed on /hello
     • Associated unit tests for testing your application in native mode and JVM mode
     • A landing page that is accessible on http://localhost:8080 after you start the application
     • Example Dockerfile.jvm, Dockerfile.native, and Dockerfile.fast-jar files in the src/main/docker directory
     • The application configuration file

4. After the directory structure is created, open the pom.xml file in a text editor and examine the contents of the file:

   <dependencyManagement>
       <dependencies>
           <dependency>
               <groupId>com.redhat.quarkus</groupId>
               <artifactId>quarkus-universe-bom</artifactId>
               <version>${quarkus.version}</version>
               <type>pom</type>
               <scope>import</scope>
           </dependency>
       </dependencies>
   </dependencyManagement>
   
   <build>
     <plugins>
       <plugin>
         <groupId>io.quarkus</groupId>
         <artifactId>quarkus-maven-plugin</artifactId>
         <version>${quarkus-plugin.version}</version>
         <executions>
           <execution>
             <goals>
               <goal>build</goal>
               <goal>generate-code</goal>
               <goal>generate-code-tests</goal>
             </goals>
           </execution>
         </executions>
       </plugin>
    </plugins>
   </build>

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   The Quarkus BOM is included in the <dependencyManagement> section of the pom.xml file. Therefore, you do not need to list the versions of individual Quarkus dependencies in the pom.xml file. In addition, you can see the quarkus-maven-plugin plug-in that is responsible for packaging the application and providing the development mode.

5. Review the quarkus-resteasy dependency in the pom.xml file. This dependency enables you to develop REST applications:

       <dependency>
           <groupId>io.quarkus</groupId>
           <artifactId>quarkus-resteasy</artifactId>
       </dependency>

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6. Review the src/main/java/org/acme/quickstart/GreetingResource.java file:

   package org.acme.quickstart;
   
   import javax.ws.rs.GET;
   import javax.ws.rs.Path;
   import javax.ws.rs.Produces;
   import javax.ws.rs.core.MediaType;
   
   @Path("/hello")
   public class GreetingResource {
   
       @GET
       @Produces(MediaType.TEXT_PLAIN)
       public String hello() {
           return "hello";
       }
   }

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   This file contains a simple REST endpoint that returns hello as a response to a request that you send to the /hello endpoint.

   Note

   With Quarkus, the Application class for JAX-RS is supported but not required. In addition, only one instance of the GreetingResource class is created and not one per request. You can configure this by using different *Scoped annotations, for example ApplicationScoped, RequestScoped, and so forth.