Maven: The Definitive Guide

Creating the Simple Weather Project

First, let’s use the Maven Archetype plugin to create a basic skeleton for the simple weather project. Execute the following command to create a new project:

$ mvn archetype:create -DgroupId=org.sonatype.mavenbook.ch04 \
                                         -DartifactId=simple-weather \
                                         -DpackageName=org.sonatype.mavenbook \
                                         -Dversion=1.0
[INFO] [archetype:create]
[INFO] artifact org.apache.maven.archetypes:maven-archetype-quickstart: \
       checking for updates from central
[INFO] ------------------------------------------------------------------
[INFO] Using following parameters for creating Archetype: \
       maven-archetype-quickstart:RELEASE
[INFO] ------------------------------------------------------------------
[INFO] Parameter: groupId, Value: org.sonatype.mavenbook.ch04
[INFO] Parameter: packageName, Value: org.sonatype.mavenbook
[INFO] Parameter: basedir, Value: ~/examples
[INFO] Parameter: package, Value: org.sonatype.mavenbook
[INFO] Parameter: version, Value: 1.0
[INFO] Parameter: artifactId, Value: simple-weather
[INFO] *** End of debug info from resources from generated POM ***
[INFO] Archetype created in dir: ~/examples/simple-weather

Once the Maven Archetype plugin creates the project, go into the simple-weather directory and take a look at the pom.xml file. You should see the XML document that’s shown in Example 4-1.

Example 4-1. Initial POM for the simple-weather project

<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
                      http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.sonatype.mavenbook.ch04</groupId>
  <artifactId>simple-weather</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>
  <name>simple-weather2</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.5</source>
          <target>1.5</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

Notice that we passed in the version parameter to the archetype:create goal. This overrides the default value of 1.0-SNAPSHOT. In this project, we’re developing the 1.0 version of the simple-weather project, as you can see in the pom.xml version element.