An archetype helps in automating the basic setup of a microservice. This helps in standardizing project setup across an organization.

• Multiple Layers and Dependencies
• Security
• Unit Testing
• Integration Testing
• Integration with Nexus/SONAR etc

• Read how Maven Archetype plugin works over here - http://maven.apache.org/archetype/maven-archetype-plugin/

• We have our reference microservice in the folder microservice-reference. This is a Spring Boot Project with a couple of controllers and unit/integration tests. We will use this as the reference project to reverse engineer an archetype.
• When we create a new project using a maven archetype, the two important inputs are groupId and artifactId. In the reference project we would need to make sure that everything that needs to customized based on these inputs should be using similar values. In the microservice-reference, we use the following as the standard:
  • groupId - com.organization.project
  • artifactId - project-name
• You would need to customize the reference-project to meet your needs or you can create a new reference-project.
• Ensure that you configure the latest version of maven-archetype-plugin in your microservice-reference

	<build>
		<pluginManagement>
			<plugins>
				<plugin>
					<artifactId>maven-archetype-plugin</artifactId>
					<version>3.0.1</version>
				</plugin>
			</plugins>
		</pluginManagement>
	</build>

• In the command prompt cd to the folder containing this project

cd microservice-reference
mvn archetype:create-from-project

• You will see the following statements in the log

[INFO] Setting default groupId: com.organization.project
[INFO] Setting default artifactId: project-name
[INFO] Setting default version: 0.0.2-SNAPSHOT
[INFO] Setting default package: com.organization.project

Archetype project is created in microservice-reference/target/generated-sources/archetype

• Copy the archetype project created in earlier step to the folder microservice-archetype

• cd to the root of the project and run

mvn clean install

• This will install the archetype to your local repository

[INFO] Installing /in28Minutes/git/microservice-archetype/microservice-archetype/target/project-name-archetype-0.0.2-SNAPSHOT.jar to /Users/rangaraokaranam/.m2/repository/com/organization/project/project-name-archetype/0.0.2-SNAPSHOT/project-name-archetype-0.0.2-SNAPSHOT.jar

• Create a new folder on your hard drive. Let's call it first-project
• Execute the following commands

cd first-project
mvn archetype:generate -DarchetypeCatalog=local

• archetype plugin asks for a groupId and artifactId as shown below

Choose a number or apply filter (format: [groupId:]artifactId, case sensitive contains): : 1
Define value for property 'groupId': com.first
Define value for property 'artifactId': first-project
Define value for property 'version' 1.0-SNAPSHOT: : 
Define value for property 'package' com.first: : 
Confirm properties configuration:
groupId: com.first
artifactId: first-project
version: 1.0-SNAPSHOT
package: com.first
 Y: : Y

• When the archetype plugin executes successfully, you should see the message shown below:

[INFO] Project created from Archetype in dir: /in28Minutes/git/microservice-archetype/first-project

You can do a mvn clean install on the new project in first-project to check it everything is good.

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