Maven - Build & Test Project

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What we learnt in Project Creation chapter is how to create a Java application using Maven. Now we'll see how to build and test the application.

Go to C:/MVN directory where you've created your java application. Open consumerBanking folder. You will see the POM.xml file with the following contents.

<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>com.companyname.projectgroup</groupId>
   <artifactId>project</artifactId>
   <version>1.0</version>
   <dependencies>
      <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>3.8.1</version>
      </dependency>
   </dependencies>  
</project>

Here you can see, Maven already added Junit as test framework. By default, Maven adds a source file App.java and a test file AppTest.java in its default directory structure, as discussed in the previous chapter.

Let's open the command console, go the C:\MVN\consumerBanking directory and execute the following mvn command.

C:\MVN\consumerBanking>mvn clean package

Maven will start building the project.

[INFO] Scanning for projects...
[INFO] -------------------------------------------------------------------
[INFO] Building consumerBanking
[INFO] task-segment: [clean, package]
[INFO] -------------------------------------------------------------------
[INFO] [clean:clean {execution: default-clean}]
[INFO] Deleting directory C:\MVN\consumerBanking\target
[INFO] [resources:resources {execution: default-resources}]

[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources,
i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory C:\MVN\consumerBanking\src\main\resources
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Compiling 1 source file to C:\MVN\consumerBanking\target\classes
[INFO] [resources:testResources {execution: default-testResources}]

[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources,
i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory C:\MVN\consumerBanking\src\test\resources
[INFO] [compiler:testCompile {execution: default-testCompile}]
[INFO] Compiling 1 source file to C:\MVN\consumerBanking\target\test-classes
[INFO] [surefire:test {execution: default-test}]
[INFO] Surefire report directory: C:\MVN\consumerBanking\target\surefire-reports

-----------------------------------------------------
T E S T S
-----------------------------------------------------

Running com.companyname.bank.AppTest

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.027 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO] [jar:jar {execution: default-jar}]
[INFO] Building jar: C:\MVN\consumerBanking\target\
consumerBanking-1.0-SNAPSHOT.jar

[INFO]-----------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO]-----------------------------------------------

[INFO] Total time: 2 seconds
[INFO] Finished at: Tue Jul 10 16:52:18 IST 2012
[INFO] Final Memory: 16M/89M
[INFO]-----------------------------------------------

You've built your project and created final jar file, following are the key learning concepts −

  • We give maven two goals, first to clean the target directory (clean) and then package the project build output as jar (package).

  • Packaged jar is available in consumerBanking\target folder as consumerBanking-1.0-SNAPSHOT.jar.

  • Test reports are available in consumerBanking\target\surefire-reports folder.

  • Maven compiles the source code file(s) and then tests the source code file(s).

  • Then Maven runs the test cases.

  • Finally, Maven creates the package.

Now open the command console, go the C:\MVN\consumerBanking\target\classes directory and execute the following java command.

>java com.companyname.bank.App

You will see the result as follows −

Hello World!

Adding Java Source Files

Let's see how we can add additional Java files in our project. Open C:\MVN\consumerBanking\src\main\java\com\companyname\bank folder, create Util class in it as Util.java.

package com.companyname.bank;

public class Util {
   public static void printMessage(String message){
      System.out.println(message);
   }
}

Update the App class to use Util class.

package com.companyname.bank;

/**
   * Hello world!
   *
*/

public class App {
   public static void main( String[] args ){
      Util.printMessage("Hello World!");
   }
}

Now open the command console, go the C:\MVN\consumerBanking directory and execute the following mvn command.

>mvn clean compile

After Maven build is successful, go to the C:\MVN\consumerBanking\target\classes directory and execute the following java command.

>java -cp com.companyname.bank.App

You will see the result as follows −

Hello World!
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