Even though Scala is commonly used with SBT, it’s also possible to use it with Maven, particularly if you already have a Maven based project and you want to use Scala with it.
So, let’s use a pom.xml for a simple java application like this:
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<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>br.com.rodrigolazoti</groupId>
<artifactId>scalaproject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
Right, now let’s set up the project’s pom file to adding support for Scala code.
####Add scala-tools repository
The Maven needs to know where to find the plugin and the Scala library, so add this repository to pom.xml:
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<repositories>
<repository>
<id>scala-tools</id>
<url>https://oss.sonatype.org/content/groups/scala-tools/</url>
</repository>
</repositories>
####Add scala library dependency
The scala’s version that I’ll use for this example is 2.10.0.
Add this dependency to pom.xml:
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<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.10.0</version>
</dependency>
####Add maven-scala-plugin
Add the maven-scala-plugin to pom.xml:
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<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<version>2.15.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
####Add some Scala code
Let’s add some scala code to the project.
Create a file called /src/main/scala/App.scala and put the following code into it:
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object App extends App {
List("Hello ", "world", "!") foreach print
}
####Conclusion
From now on you can execute mvn package to build your project or mvn test to test your project, and the Scala code will get built automatically. ;)
See below the complete project’s pom file:
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<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>br.com.rodrigolazoti</groupId>
<artifactId>scalaproject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<repositories>
<repository>
<id>scala-tools</id>
<url>https://oss.sonatype.org/content/groups/scala-tools/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.10.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<version>2.15.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
<configuration>
<args>
<arg>-optimise</arg>
<arg>-unchecked</arg>
<arg>-deprecation</arg>
</args>
<charset>UTF-8</charset>
</configuration>
</plugin>
</plugins>
</build>
</project>