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 D:\Projects\MVN directory where you've created your java application. Open consumerBanking folder. You will see the POM.xml file with the following contents. Update it to reflect the current java version.

pom.xml

<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>
   <properties>
      <maven.compiler.source>24</maven.compiler.source>
      <maven.compiler.target>24</maven.compiler.target>
   </properties>
   <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 D:\Projects\MVN\consumerBanking directory and execute the following mvn command.

D:\Projects\MVN\consumerBanking>mvn clean package

Maven will start building the project.

D:\Projects\MVN\consumerBanking>mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] --------------------------------
[INFO] Building consumerBanking 1.0-SNAPSHOT
[INFO]   from pom.xml
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- clean:3.2.0:clean (default-clean) @ consumerBanking ---
[INFO]
[INFO] --- resources:3.3.1:resources (default-resources) @ consumerBanking ---
[INFO] skip non existing resourceDirectory D:\Projects\MVN\consumerBanking\src\main\resources
[INFO]
[INFO] --- compiler:3.13.0:compile (default-compile) @ consumerBanking ---
[INFO] Recompiling the module because of changed source code.
[INFO] Compiling 1 source file with javac [debug target 1.8] to target\classes
[INFO]
[INFO] --- resources:3.3.1:testResources (default-testResources) @ consumerBanking ---
[INFO] skip non existing resourceDirectory D:\Projects\MVN\consumerBanking\src\test\resources
[INFO]
[INFO] --- compiler:3.13.0:testCompile (default-testCompile) @ consumerBanking ---
[INFO] Recompiling the module because of changed dependency.
[INFO] Compiling 1 source file with javac [debug target 1.8] to target\test-classes
[INFO]
[INFO] --- surefire:3.2.5:test (default-test) @ consumerBanking ---
[INFO] Using auto detected provider org.apache.maven.surefire.junit.JUnit3Provider
[INFO]
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running com.companyname.bank.AppTest
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.032 s -- in com.companyname.bank.AppTest
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO]
[INFO] --- jar:3.4.1:jar (default-jar) @ consumerBanking ---
[INFO] Building jar: D:\Projects\MVN\consumerBanking\target\consumerBanking-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.614 s
[INFO] Finished at: 2025-09-15T12:31:04+05:30
[INFO] ------------------------------------------------------------------------

D:\Projects\MVN\consumerBanking>

Key Concepts

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 D:\Projects\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 D:\Projects\MVN\consumerBanking\src\main\java\com\companyname\bank folder, create Util class in it as Util.java.

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.

App.java

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 D:\Projects\MVN\consumerBanking directory and execute the following mvn command.

>mvn clean compile

After Maven build is successful, go to the D:\Projects\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!