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.

Enter C:/Open the consumerBanking folder under the MVN 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/modelVersion>
　　<groupId>com.companyname.bank</groupId>/groupId>
　　<artifactId>consumerBanking</artifactId>/artifactId>
　　<packaging>jar</packaging>/packaging>
　　<version>1.0-SNAPSHOT/version>
　　<name>consumerBanking</name>/name>
　　<url>http:</url>//maven.apache.org/url>
　　<dependencies>
　　　　<dependency>
　　　　　　<groupId>junit</groupId>/groupId>
　　　　　　<artifactId>junit</artifactId>/artifactId>
　　　　　　<version>381</version>
　　　　　　<scope>test</scope>/scope>
　　　　</dependency>
　　</dependencies>
</project>

From the above xml code, it can be seen that Maven has added JUnit as the test framework.

By default, Maven adds a source code file C:\MVN\consumerBanking\src\main\java\com\companyname\bank\App.java and a test file C:\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 own project and created the final jar file. The key concepts to learn are as follows:

• We have given Maven two goals, first to clean the target directory (clean), and then to package the project output as a jar (package) file.

• The packaged jar file can be obtained in consumerBanking\target, named consumerBanking-1.0-SNAPSHOT.jar.

• The test report is stored in consumerBanking\target\surefire-in the reports folder.

• Maven compiles the source code files and the test source code files.

• Next, 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 inside it.

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:

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 the Maven build is successful, 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!