Maven Build & Project Testing

In the previous chapter, we learned how to use Maven to create a Java application. Next, we will learn how to build and test this project.

Go to the C:/MVN folder and open the consumerBanking folder. You will see a pom.xml file, with the following code:

<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>com.companyname.bank</groupId> <artifactId>consumerBanking</artifactId> <packaging>jar</packaging> <version>1.0-SNAPSHOT</version> <name>consumerBanking</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> </project>

From the above xml code, you can see that Maven has added JUnit as a test framework.

By default, Maven adds a source fileC:\MVN\consumerBanking\src\main\java\com\companyname\bank\App.javaand a test fileC:\MVN\consumerBanking\src\test\java\com\companyname\bank\AppTest.java。

Open the command console, navigate to the C:\MVN\consumerBanking directory, and execute the following mvn command to start building the project:

C:\MVN\consumerBanking>mvn clean package
[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] [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] ------------------------------------------------------------------------

After execution, we have built our project and created the final jar file. The following are key concepts to learn:

  • We gave Maven two goals: first clean the target directory (clean), then package the project build output as a jar (package) file.
  • The packaged jar file can be found in the consumerBanking\target directory, with the name consumerBanking-1.0-SNAPSHOT.jar.
  • Test reports are stored in the consumerBanking\target\surefire-reports folder.
  • Maven compiles the source files, as well as the test source files.
  • Then Maven runs the test cases.
  • Finally, Maven creates the project package.
C:\MVN\consumerBanking\target\classes>java com.companyname.bank.App

You can see the result:

Hello World!
Add Java Source File

Next, let's see how to add other Java files to the project. Open the C:\MVN\consumerBanking\src\main\java\com\companyname\bank folder and create the Util class Util.java in it.

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 the 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, navigate to the C:\MVN\consumerBanking directory, and execute the following mvn command.

C:\MVN\consumerBanking>mvn clean compile

After Maven builds successfully, navigate to the C:\MVN\consumerBanking\target\classes directory and execute the following java command.

C:\MVN\consumerBanking\target\classes>java -cp . com.companyname.bank.App

You can see the result:

Hello World!
Other Extensions